# generated automatically by aclocal 1.15 -*- Autoconf -*-

# Copyright (C) 1996-2014 Free Software Foundation, Inc.

# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
m4_ifndef([AC_AUTOCONF_VERSION],
  [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.69],,
[m4_warning([this file was generated for autoconf 2.69.
You have another version of autoconf.  It may work, but is not guaranteed to.
If you have problems, you may need to regenerate the build system entirely.
To do so, use the procedure documented by the package, typically 'autoreconf'.])])

# ============================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_append_compile_flags.html
# ============================================================================
#
# SYNOPSIS
#
#   AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
#   For every FLAG1, FLAG2 it is checked whether the compiler works with the
#   flag.  If it does, the flag is added FLAGS-VARIABLE
#
#   If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
#   CFLAGS) is used.  During the check the flag is always added to the
#   current language's flags.
#
#   If EXTRA-FLAGS is defined, it is added to the current language's default
#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
#   force the compiler to issue an error when a bad flag is given.
#
#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
#
#   NOTE: This macro depends on the AX_APPEND_FLAG and
#   AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
#   AX_APPEND_LINK_FLAGS.
#
# LICENSE
#
#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <https://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

#serial 6

AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
[AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
for flag in $1; do
  AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
done
])dnl AX_APPEND_COMPILE_FLAGS

# ===========================================================================
#   https://www.gnu.org/software/autoconf-archive/ax_append_link_flags.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
#   For every FLAG1, FLAG2 it is checked whether the linker works with the
#   flag.  If it does, the flag is added FLAGS-VARIABLE
#
#   If FLAGS-VARIABLE is not specified, the linker's flags (LDFLAGS) is
#   used. During the check the flag is always added to the linker's flags.
#
#   If EXTRA-FLAGS is defined, it is added to the linker's default flags
#   when the check is done.  The check is thus made with the flags: "LDFLAGS
#   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
#   issue an error when a bad flag is given.
#
#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
#
#   NOTE: This macro depends on the AX_APPEND_FLAG and AX_CHECK_LINK_FLAG.
#   Please keep this macro in sync with AX_APPEND_COMPILE_FLAGS.
#
# LICENSE
#
#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <https://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

#serial 6

AC_DEFUN([AX_APPEND_LINK_FLAGS],
[AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
for flag in $1; do
  AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
done
])dnl AX_APPEND_LINK_FLAGS

# ===========================================================================
#    https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
#
# DESCRIPTION
#
#   Check whether the given FLAG works with the linker or gives an error.
#   (Warnings, however, are ignored)
#
#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
#   success/failure.
#
#   If EXTRA-FLAGS is defined, it is added to the linker's default flags
#   when the check is done.  The check is thus made with the flags: "LDFLAGS
#   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
#   issue an error when a bad flag is given.
#
#   INPUT gives an alternative input source to AC_LINK_IFELSE.
#
#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
#   macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
#
# LICENSE
#
#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
#
#   This program is free software: you can redistribute it and/or modify it
#   under the terms of the GNU General Public License as published by the
#   Free Software Foundation, either version 3 of the License, or (at your
#   option) any later version.
#
#   This program is distributed in the hope that it will be useful, but
#   WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
#   Public License for more details.
#
#   You should have received a copy of the GNU General Public License along
#   with this program. If not, see <https://www.gnu.org/licenses/>.
#
#   As a special exception, the respective Autoconf Macro's copyright owner
#   gives unlimited permission to copy, distribute and modify the configure
#   scripts that are the output of Autoconf when processing the Macro. You
#   need not follow the terms of the GNU General Public License when using
#   or distributing such scripts, even though portions of the text of the
#   Macro appear in them. The GNU General Public License (GPL) does govern
#   all other use of the material that constitutes the Autoconf Macro.
#
#   This special exception to the GPL applies to versions of the Autoconf
#   Macro released by the Autoconf Archive. When you make and distribute a
#   modified version of the Autoconf Macro, you may extend this special
#   exception to the GPL to apply to your modified version as well.

#serial 5

AC_DEFUN([AX_CHECK_LINK_FLAG],
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
  ax_check_save_flags=$LDFLAGS
  LDFLAGS="$LDFLAGS $4 $1"
  AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
    [AS_VAR_SET(CACHEVAR,[yes])],
    [AS_VAR_SET(CACHEVAR,[no])])
  LDFLAGS=$ax_check_save_flags])
AS_VAR_IF(CACHEVAR,yes,
  [m4_default([$2], :)],
  [m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_LINK_FLAGS

# ===========================================================================
#    https://www.gnu.org/software/autoconf-archive/ax_compiler_flags.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_COMPILER_FLAGS([CFLAGS-VARIABLE], [LDFLAGS-VARIABLE], [IS-RELEASE], [EXTRA-BASE-CFLAGS], [EXTRA-YES-CFLAGS], [UNUSED], [UNUSED], [UNUSED], [EXTRA-BASE-LDFLAGS], [EXTRA-YES-LDFLAGS], [UNUSED], [UNUSED], [UNUSED])
#
# DESCRIPTION
#
#   Check for the presence of an --enable-compile-warnings option to
#   configure, defaulting to "error" in normal operation, or "yes" if
#   IS-RELEASE is equal to "yes".  Return the value in the variable
#   $ax_enable_compile_warnings.
#
#   Depending on the value of --enable-compile-warnings, different compiler
#   warnings are checked to see if they work with the current compiler and,
#   if so, are appended to CFLAGS-VARIABLE and LDFLAGS-VARIABLE.  This
#   allows a consistent set of baseline compiler warnings to be used across
#   a code base, irrespective of any warnings enabled locally by individual
#   developers.  By standardising the warnings used by all developers of a
#   project, the project can commit to a zero-warnings policy, using -Werror
#   to prevent compilation if new warnings are introduced.  This makes
#   catching bugs which are flagged by warnings a lot easier.
#
#   By providing a consistent --enable-compile-warnings argument across all
#   projects using this macro, continuous integration systems can easily be
#   configured the same for all projects.  Automated systems or build
#   systems aimed at beginners may want to pass the --disable-Werror
#   argument to unconditionally prevent warnings being fatal.
#
#   --enable-compile-warnings can take the values:
#
#    * no:      Base compiler warnings only; not even -Wall.
#    * yes:     The above, plus a broad range of useful warnings.
#    * error:   The above, plus -Werror so that all warnings are fatal.
#               Use --disable-Werror to override this and disable fatal
#               warnings.
#
#   The set of base and enabled flags can be augmented using the
#   EXTRA-*-CFLAGS and EXTRA-*-LDFLAGS variables, which are tested and
#   appended to the output variable if --enable-compile-warnings is not
#   "no". Flags should not be disabled using these arguments, as the entire
#   point of AX_COMPILER_FLAGS is to enforce a consistent set of useful
#   compiler warnings on code, using warnings which have been chosen for low
#   false positive rates.  If a compiler emits false positives for a
#   warning, a #pragma should be used in the code to disable the warning
#   locally. See:
#
#     https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/Diagnostic-Pragmas.html#Diagnostic-Pragmas
#
#   The EXTRA-* variables should only be used to supply extra warning flags,
#   and not general purpose compiler flags, as they are controlled by
#   configure options such as --disable-Werror.
#
#   IS-RELEASE can be used to disable -Werror when making a release, which
#   is useful for those hairy moments when you just want to get the release
#   done as quickly as possible.  Set it to "yes" to disable -Werror. By
#   default, it uses the value of $ax_is_release, so if you are using the
#   AX_IS_RELEASE macro, there is no need to pass this parameter. For
#   example:
#
#     AX_IS_RELEASE([git-directory])
#     AX_COMPILER_FLAGS()
#
#   CFLAGS-VARIABLE defaults to WARN_CFLAGS, and LDFLAGS-VARIABLE defaults
#   to WARN_LDFLAGS.  Both variables are AC_SUBST-ed by this macro, but must
#   be manually added to the CFLAGS and LDFLAGS variables for each target in
#   the code base.
#
#   If C++ language support is enabled with AC_PROG_CXX, which must occur
#   before this macro in configure.ac, warning flags for the C++ compiler
#   are AC_SUBST-ed as WARN_CXXFLAGS, and must be manually added to the
#   CXXFLAGS variables for each target in the code base.  EXTRA-*-CFLAGS can
#   be used to augment the base and enabled flags.
#
#   Warning flags for g-ir-scanner (from GObject Introspection) are
#   AC_SUBST-ed as WARN_SCANNERFLAGS.  This variable must be manually added
#   to the SCANNERFLAGS variable for each GIR target in the code base.  If
#   extra g-ir-scanner flags need to be enabled, the AX_COMPILER_FLAGS_GIR
#   macro must be invoked manually.
#
#   AX_COMPILER_FLAGS may add support for other tools in future, in addition
#   to the compiler and linker.  No extra EXTRA-* variables will be added
#   for those tools, and all extra support will still use the single
#   --enable-compile-warnings configure option.  For finer grained control
#   over the flags for individual tools, use AX_COMPILER_FLAGS_CFLAGS,
#   AX_COMPILER_FLAGS_LDFLAGS and AX_COMPILER_FLAGS_* for new tools.
#
#   The UNUSED variables date from a previous version of this macro, and are
#   automatically appended to the preceding non-UNUSED variable. They should
#   be left empty in new uses of the macro.
#
# LICENSE
#
#   Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
#   Copyright (c) 2015 David King <amigadave@amigadave.com>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 14

# _AX_COMPILER_FLAGS_LANG([LANGNAME])
m4_defun([_AX_COMPILER_FLAGS_LANG],
[m4_ifdef([_AX_COMPILER_FLAGS_LANG_]$1[_enabled], [],
          [m4_define([_AX_COMPILER_FLAGS_LANG_]$1[_enabled], [])dnl
           AX_REQUIRE_DEFINED([AX_COMPILER_FLAGS_]$1[FLAGS])])dnl
])

AC_DEFUN([AX_COMPILER_FLAGS],[
    # C support is enabled by default.
    _AX_COMPILER_FLAGS_LANG([C])
    # Only enable C++ support if AC_PROG_CXX is called. The redefinition of
    # AC_PROG_CXX is so that a fatal error is emitted if this macro is called
    # before AC_PROG_CXX, which would otherwise cause no C++ warnings to be
    # checked.
    AC_PROVIDE_IFELSE([AC_PROG_CXX],
                      [_AX_COMPILER_FLAGS_LANG([CXX])],
                      [m4_define([AC_PROG_CXX], defn([AC_PROG_CXX])[_AX_COMPILER_FLAGS_LANG([CXX])])])
    AX_REQUIRE_DEFINED([AX_COMPILER_FLAGS_LDFLAGS])

    # Default value for IS-RELEASE is $ax_is_release
    ax_compiler_flags_is_release=m4_tolower(m4_normalize(ifelse([$3],,
                                                                [$ax_is_release],
                                                                [$3])))

    AC_ARG_ENABLE([compile-warnings],
                  AS_HELP_STRING([--enable-compile-warnings=@<:@no/yes/error@:>@],
                                 [Enable compiler warnings and errors]),,
                  [AS_IF([test "$ax_compiler_flags_is_release" = "yes"],
                         [enable_compile_warnings="yes"],
                         [enable_compile_warnings="error"])])
    AC_ARG_ENABLE([Werror],
                  AS_HELP_STRING([--disable-Werror],
                                 [Unconditionally make all compiler warnings non-fatal]),,
                  [enable_Werror=maybe])

    # Return the user's chosen warning level
    AS_IF([test "$enable_Werror" = "no" -a \
                "$enable_compile_warnings" = "error"],[
        enable_compile_warnings="yes"
    ])

    ax_enable_compile_warnings=$enable_compile_warnings

    AX_COMPILER_FLAGS_CFLAGS([$1],[$ax_compiler_flags_is_release],
                             [$4],[$5 $6 $7 $8])
    m4_ifdef([_AX_COMPILER_FLAGS_LANG_CXX_enabled],
             [AX_COMPILER_FLAGS_CXXFLAGS([WARN_CXXFLAGS],
                                         [$ax_compiler_flags_is_release],
                                         [$4],[$5 $6 $7 $8])])
    AX_COMPILER_FLAGS_LDFLAGS([$2],[$ax_compiler_flags_is_release],
                              [$9],[$10 $11 $12 $13])
    AX_COMPILER_FLAGS_GIR([WARN_SCANNERFLAGS],[$ax_compiler_flags_is_release])
])dnl AX_COMPILER_FLAGS

# =============================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cflags.html
# =============================================================================
#
# SYNOPSIS
#
#   AX_COMPILER_FLAGS_CFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
#
# DESCRIPTION
#
#   Add warning flags for the C compiler to VARIABLE, which defaults to
#   WARN_CFLAGS.  VARIABLE is AC_SUBST-ed by this macro, but must be
#   manually added to the CFLAGS variable for each target in the code base.
#
#   This macro depends on the environment set up by AX_COMPILER_FLAGS.
#   Specifically, it uses the value of $ax_enable_compile_warnings to decide
#   which flags to enable.
#
# LICENSE
#
#   Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 14

AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[
    AC_REQUIRE([AC_PROG_SED])
    AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
    AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
    AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])

    # Variable names
    m4_define([ax_warn_cflags_variable],
              [m4_normalize(ifelse([$1],,[WARN_CFLAGS],[$1]))])

    AC_LANG_PUSH([C])

    # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
    # flags, otherwise they are always appended to the warn_cflags variable, and
    # Clang warns on them for every compilation unit.
    # If this is passed to GCC, it will explode, so the flag must be enabled
    # conditionally.
    AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
        ax_compiler_flags_test="-Werror=unknown-warning-option"
    ],[
        ax_compiler_flags_test=""
    ])

    # Check that -Wno-suggest-attribute=format is supported
    AX_CHECK_COMPILE_FLAG([-Wno-suggest-attribute=format],[
        ax_compiler_no_suggest_attribute_flags="-Wno-suggest-attribute=format"
    ],[
        ax_compiler_no_suggest_attribute_flags=""
    ])

    # Base flags
    AX_APPEND_COMPILE_FLAGS([ dnl
        -fno-strict-aliasing dnl
        $3 dnl
    ],ax_warn_cflags_variable,[$ax_compiler_flags_test])

    AS_IF([test "$ax_enable_compile_warnings" != "no"],[
        # "yes" flags
        AX_APPEND_COMPILE_FLAGS([ dnl
            -Wall dnl
            -Wextra dnl
            -Wundef dnl
            -Wnested-externs dnl
            -Wwrite-strings dnl
            -Wpointer-arith dnl
            -Wmissing-declarations dnl
            -Wmissing-prototypes dnl
            -Wstrict-prototypes dnl
            -Wredundant-decls dnl
            -Wno-unused-parameter dnl
            -Wno-missing-field-initializers dnl
            -Wdeclaration-after-statement dnl
            -Wformat=2 dnl
            -Wold-style-definition dnl
            -Wcast-align dnl
            -Wformat-nonliteral dnl
            -Wformat-security dnl
            -Wsign-compare dnl
            -Wstrict-aliasing dnl
            -Wshadow dnl
            -Winline dnl
            -Wpacked dnl
            -Wmissing-format-attribute dnl
            -Wmissing-noreturn dnl
            -Winit-self dnl
            -Wredundant-decls dnl
            -Wmissing-include-dirs dnl
            -Wunused-but-set-variable dnl
            -Warray-bounds dnl
            -Wimplicit-function-declaration dnl
            -Wreturn-type dnl
            -Wswitch-enum dnl
            -Wswitch-default dnl
            $4 dnl
            $5 dnl
            $6 dnl
            $7 dnl
        ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
    ])
    AS_IF([test "$ax_enable_compile_warnings" = "error"],[
        # "error" flags; -Werror has to be appended unconditionally because
        # it's not possible to test for
        #
        # suggest-attribute=format is disabled because it gives too many false
        # positives
        AX_APPEND_FLAG([-Werror],ax_warn_cflags_variable)

        AX_APPEND_COMPILE_FLAGS([ dnl
            [$ax_compiler_no_suggest_attribute_flags] dnl
        ],ax_warn_cflags_variable,[$ax_compiler_flags_test])
    ])

    # In the flags below, when disabling specific flags, always add *both*
    # -Wno-foo and -Wno-error=foo. This fixes the situation where (for example)
    # we enable -Werror, disable a flag, and a build bot passes CFLAGS=-Wall,
    # which effectively turns that flag back on again as an error.
    for flag in $ax_warn_cflags_variable; do
        AS_CASE([$flag],
                [-Wno-*=*],[],
                [-Wno-*],[
                    AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')],
                                            ax_warn_cflags_variable,
                                            [$ax_compiler_flags_test])
                ])
    done

    AC_LANG_POP([C])

    # Substitute the variables
    AC_SUBST(ax_warn_cflags_variable)
])dnl AX_COMPILER_FLAGS

# ===============================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cxxflags.html
# ===============================================================================
#
# SYNOPSIS
#
#   AX_COMPILER_FLAGS_CXXFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
#
# DESCRIPTION
#
#   Add warning flags for the C++ compiler to VARIABLE, which defaults to
#   WARN_CXXFLAGS.  VARIABLE is AC_SUBST-ed by this macro, but must be
#   manually added to the CXXFLAGS variable for each target in the code
#   base.
#
#   This macro depends on the environment set up by AX_COMPILER_FLAGS.
#   Specifically, it uses the value of $ax_enable_compile_warnings to decide
#   which flags to enable.
#
# LICENSE
#
#   Copyright (c) 2015 David King <amigadave@amigadave.com>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 10

AC_DEFUN([AX_COMPILER_FLAGS_CXXFLAGS],[
    AC_REQUIRE([AC_PROG_SED])
    AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
    AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
    AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])

    # Variable names
    m4_define([ax_warn_cxxflags_variable],
              [m4_normalize(ifelse([$1],,[WARN_CXXFLAGS],[$1]))])

    AC_LANG_PUSH([C++])

    # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
    # flags, otherwise they are always appended to the warn_cxxflags variable,
    # and Clang warns on them for every compilation unit.
    # If this is passed to GCC, it will explode, so the flag must be enabled
    # conditionally.
    AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
        ax_compiler_flags_test="-Werror=unknown-warning-option"
    ],[
        ax_compiler_flags_test=""
    ])

    # Check that -Wno-suggest-attribute=format is supported
    AX_CHECK_COMPILE_FLAG([-Wno-suggest-attribute=format],[
        ax_compiler_no_suggest_attribute_flags="-Wno-suggest-attribute=format"
    ],[
        ax_compiler_no_suggest_attribute_flags=""
    ])

    # Base flags
    AX_APPEND_COMPILE_FLAGS([ dnl
        -fno-strict-aliasing dnl
        $3 dnl
    ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])

    AS_IF([test "$ax_enable_compile_warnings" != "no"],[
        # "yes" flags
        AX_APPEND_COMPILE_FLAGS([ dnl
            -Wall dnl
            -Wextra dnl
            -Wundef dnl
            -Wwrite-strings dnl
            -Wpointer-arith dnl
            -Wmissing-declarations dnl
            -Wredundant-decls dnl
            -Wno-unused-parameter dnl
            -Wno-missing-field-initializers dnl
            -Wformat=2 dnl
            -Wcast-align dnl
            -Wformat-nonliteral dnl
            -Wformat-security dnl
            -Wsign-compare dnl
            -Wstrict-aliasing dnl
            -Wshadow dnl
            -Winline dnl
            -Wpacked dnl
            -Wmissing-format-attribute dnl
            -Wmissing-noreturn dnl
            -Winit-self dnl
            -Wredundant-decls dnl
            -Wmissing-include-dirs dnl
            -Wunused-but-set-variable dnl
            -Warray-bounds dnl
            -Wreturn-type dnl
            -Wno-overloaded-virtual dnl
            -Wswitch-enum dnl
            -Wswitch-default dnl
            $4 dnl
            $5 dnl
            $6 dnl
            $7 dnl
        ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])
    ])
    AS_IF([test "$ax_enable_compile_warnings" = "error"],[
        # "error" flags; -Werror has to be appended unconditionally because
        # it's not possible to test for
        #
        # suggest-attribute=format is disabled because it gives too many false
        # positives
        AX_APPEND_FLAG([-Werror],ax_warn_cxxflags_variable)

        AX_APPEND_COMPILE_FLAGS([ dnl
            [$ax_compiler_no_suggest_attribute_flags] dnl
        ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])
    ])

    # In the flags below, when disabling specific flags, always add *both*
    # -Wno-foo and -Wno-error=foo. This fixes the situation where (for example)
    # we enable -Werror, disable a flag, and a build bot passes CXXFLAGS=-Wall,
    # which effectively turns that flag back on again as an error.
    for flag in $ax_warn_cxxflags_variable; do
        AS_CASE([$flag],
                [-Wno-*=*],[],
                [-Wno-*],[
                    AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')],
                                            ax_warn_cxxflags_variable,
                                            [$ax_compiler_flags_test])
                ])
    done

    AC_LANG_POP([C++])

    # Substitute the variables
    AC_SUBST(ax_warn_cxxflags_variable)
])dnl AX_COMPILER_FLAGS_CXXFLAGS

# ===========================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_gir.html
# ===========================================================================
#
# SYNOPSIS
#
#   AX_COMPILER_FLAGS_GIR([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
#
# DESCRIPTION
#
#   Add warning flags for the g-ir-scanner (from GObject Introspection) to
#   VARIABLE, which defaults to WARN_SCANNERFLAGS.  VARIABLE is AC_SUBST-ed
#   by this macro, but must be manually added to the SCANNERFLAGS variable
#   for each GIR target in the code base.
#
#   This macro depends on the environment set up by AX_COMPILER_FLAGS.
#   Specifically, it uses the value of $ax_enable_compile_warnings to decide
#   which flags to enable.
#
# LICENSE
#
#   Copyright (c) 2015 Philip Withnall <philip@tecnocode.co.uk>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 6

AC_DEFUN([AX_COMPILER_FLAGS_GIR],[
    AX_REQUIRE_DEFINED([AX_APPEND_FLAG])

    # Variable names
    m4_define([ax_warn_scannerflags_variable],
              [m4_normalize(ifelse([$1],,[WARN_SCANNERFLAGS],[$1]))])

    # Base flags
    AX_APPEND_FLAG([$3],ax_warn_scannerflags_variable)

    AS_IF([test "$ax_enable_compile_warnings" != "no"],[
        # "yes" flags
        AX_APPEND_FLAG([ dnl
            --warn-all dnl
            $4 dnl
            $5 dnl
            $6 dnl
            $7 dnl
        ],ax_warn_scannerflags_variable)
    ])
    AS_IF([test "$ax_enable_compile_warnings" = "error"],[
        # "error" flags
        AX_APPEND_FLAG([ dnl
            --warn-error dnl
        ],ax_warn_scannerflags_variable)
    ])

    # Substitute the variables
    AC_SUBST(ax_warn_scannerflags_variable)
])dnl AX_COMPILER_FLAGS

# ==============================================================================
#  https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_ldflags.html
# ==============================================================================
#
# SYNOPSIS
#
#   AX_COMPILER_FLAGS_LDFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
#
# DESCRIPTION
#
#   Add warning flags for the linker to VARIABLE, which defaults to
#   WARN_LDFLAGS.  VARIABLE is AC_SUBST-ed by this macro, but must be
#   manually added to the LDFLAGS variable for each target in the code base.
#
#   This macro depends on the environment set up by AX_COMPILER_FLAGS.
#   Specifically, it uses the value of $ax_enable_compile_warnings to decide
#   which flags to enable.
#
# LICENSE
#
#   Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.  This file is offered as-is, without any
#   warranty.

#serial 8

AC_DEFUN([AX_COMPILER_FLAGS_LDFLAGS],[
    AX_REQUIRE_DEFINED([AX_APPEND_LINK_FLAGS])
    AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
    AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
    AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])

    # Variable names
    m4_define([ax_warn_ldflags_variable],
              [m4_normalize(ifelse([$1],,[WARN_LDFLAGS],[$1]))])

    # Always pass -Werror=unknown-warning-option to get Clang to fail on bad
    # flags, otherwise they are always appended to the warn_ldflags variable,
    # and Clang warns on them for every compilation unit.
    # If this is passed to GCC, it will explode, so the flag must be enabled
    # conditionally.
    AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
        ax_compiler_flags_test="-Werror=unknown-warning-option"
    ],[
        ax_compiler_flags_test=""
    ])

    # macOS linker does not have --as-needed
    AX_CHECK_LINK_FLAG([-Wl,--no-as-needed], [
        ax_compiler_flags_as_needed_option="-Wl,--no-as-needed"
    ], [
        ax_compiler_flags_as_needed_option=""
    ])

    # macOS linker speaks with a different accent
    ax_compiler_flags_fatal_warnings_option=""
    AX_CHECK_LINK_FLAG([-Wl,--fatal-warnings], [
        ax_compiler_flags_fatal_warnings_option="-Wl,--fatal-warnings"
    ])
    AX_CHECK_LINK_FLAG([-Wl,-fatal_warnings], [
        ax_compiler_flags_fatal_warnings_option="-Wl,-fatal_warnings"
    ])

    # Base flags
    AX_APPEND_LINK_FLAGS([ dnl
        $ax_compiler_flags_as_needed_option dnl
        $3 dnl
    ],ax_warn_ldflags_variable,[$ax_compiler_flags_test])

    AS_IF([test "$ax_enable_compile_warnings" != "no"],[
        # "yes" flags
        AX_APPEND_LINK_FLAGS([$4 $5 $6 $7],
                                ax_warn_ldflags_variable,
                                [$ax_compiler_flags_test])
    ])
    AS_IF([test "$ax_enable_compile_warnings" = "error"],[
        # "error" flags; -Werror has to be appended unconditionally because
        # it's not possible to test for
        #
        # suggest-attribute=format is disabled because it gives too many false
        # positives
        AX_APPEND_LINK_FLAGS([ dnl
            $ax_compiler_flags_fatal_warnings_option dnl
        ],ax_warn_ldflags_variable,[$ax_compiler_flags_test])
    ])

    # Substitute the variables
    AC_SUBST(ax_warn_ldflags_variable)
])dnl AX_COMPILER_FLAGS

# longlong.m4 serial 17
dnl Copyright (C) 1999-2007, 2009-2016 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Paul Eggert.

# Define HAVE_LONG_LONG_INT if 'long long int' works.
# This fixes a bug in Autoconf 2.61, and can be faster
# than what's in Autoconf 2.62 through 2.68.

# Note: If the type 'long long int' exists but is only 32 bits large
# (as on some very old compilers), HAVE_LONG_LONG_INT will not be
# defined. In this case you can treat 'long long int' like 'long int'.

AC_DEFUN([AC_TYPE_LONG_LONG_INT],
[
  AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
  AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
     [ac_cv_type_long_long_int=yes
      if test "x${ac_cv_prog_cc_c99-no}" = xno; then
        ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
        if test $ac_cv_type_long_long_int = yes; then
          dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
          dnl If cross compiling, assume the bug is not important, since
          dnl nobody cross compiles for this platform as far as we know.
          AC_RUN_IFELSE(
            [AC_LANG_PROGRAM(
               [[@%:@include <limits.h>
                 @%:@ifndef LLONG_MAX
                 @%:@ define HALF \
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                 @%:@ define LLONG_MAX (HALF - 1 + HALF)
                 @%:@endif]],
               [[long long int n = 1;
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                   {
                     long long int m = n << i;
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                 return 0;]])],
            [],
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            [:])
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    AC_DEFINE([HAVE_LONG_LONG_INT], [1],
      [Define to 1 if the system has the type 'long long int'.])
  fi
])

# Define HAVE_UNSIGNED_LONG_LONG_INT if 'unsigned long long int' works.
# This fixes a bug in Autoconf 2.61, and can be faster
# than what's in Autoconf 2.62 through 2.68.

# Note: If the type 'unsigned long long int' exists but is only 32 bits
# large (as on some very old compilers), AC_TYPE_UNSIGNED_LONG_LONG_INT
# will not be defined. In this case you can treat 'unsigned long long int'
# like 'unsigned long int'.

AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
[
  AC_CACHE_CHECK([for unsigned long long int],
    [ac_cv_type_unsigned_long_long_int],
    [ac_cv_type_unsigned_long_long_int=yes
     if test "x${ac_cv_prog_cc_c99-no}" = xno; then
       AC_LINK_IFELSE(
         [_AC_TYPE_LONG_LONG_SNIPPET],
         [],
         [ac_cv_type_unsigned_long_long_int=no])
     fi])
  if test $ac_cv_type_unsigned_long_long_int = yes; then
    AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
      [Define to 1 if the system has the type 'unsigned long long int'.])
  fi
])

# Expands to a C program that can be used to test for simultaneous support
# of 'long long' and 'unsigned long long'. We don't want to say that
# 'long long' is available if 'unsigned long long' is not, or vice versa,
# because too many programs rely on the symmetry between signed and unsigned
# integer types (excluding 'bool').
AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
[
  AC_LANG_PROGRAM(
    [[/* For now, do not test the preprocessor; as of 2007 there are too many
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         be revisited in 2012.  In the meantime, code should not expect
         #if to work with literals wider than 32 bits.  */
      /* Test literals.  */
      long long int ll = 9223372036854775807ll;
      long long int nll = -9223372036854775807LL;
      unsigned long long int ull = 18446744073709551615ULL;
      /* Test constant expressions.   */
      typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
                     ? 1 : -1)];
      typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
                     ? 1 : -1)];
      int i = 63;]],
    [[/* Test availability of runtime routines for shift and division.  */
      long long int llmax = 9223372036854775807ll;
      unsigned long long int ullmax = 18446744073709551615ull;
      return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
              | (llmax / ll) | (llmax % ll)
              | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
              | (ullmax / ull) | (ullmax % ull));]])
])

# Copyright (C) 2002-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_AUTOMAKE_VERSION(VERSION)
# ----------------------------
# Automake X.Y traces this macro to ensure aclocal.m4 has been
# generated from the m4 files accompanying Automake X.Y.
# (This private macro should not be called outside this file.)
AC_DEFUN([AM_AUTOMAKE_VERSION],
[am__api_version='1.15'
dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
dnl require some minimum version.  Point them to the right macro.
m4_if([$1], [1.15], [],
      [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
])

# _AM_AUTOCONF_VERSION(VERSION)
# -----------------------------
# aclocal traces this macro to find the Autoconf version.
# This is a private macro too.  Using m4_define simplifies
# the logic in aclocal, which can simply ignore this definition.
m4_define([_AM_AUTOCONF_VERSION], [])

# AM_SET_CURRENT_AUTOMAKE_VERSION
# -------------------------------
# Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
# This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
[AM_AUTOMAKE_VERSION([1.15])dnl
m4_ifndef([AC_AUTOCONF_VERSION],
  [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
_AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])

# Copyright (C) 2011-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_PROG_AR([ACT-IF-FAIL])
# -------------------------
# Try to determine the archiver interface, and trigger the ar-lib wrapper
# if it is needed.  If the detection of archiver interface fails, run
# ACT-IF-FAIL (default is to abort configure with a proper error message).
AC_DEFUN([AM_PROG_AR],
[AC_BEFORE([$0], [LT_INIT])dnl
AC_BEFORE([$0], [AC_PROG_LIBTOOL])dnl
AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
AC_REQUIRE_AUX_FILE([ar-lib])dnl
AC_CHECK_TOOLS([AR], [ar lib "link -lib"], [false])
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AC_CACHE_CHECK([the archiver ($AR) interface], [am_cv_ar_interface],
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          am_cv_ar_interface=unknown
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   AC_LANG_POP([C])])

case $am_cv_ar_interface in
ar)
  ;;
lib)
  # Microsoft lib, so override with the ar-lib wrapper script.
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esac
AC_SUBST([AR])dnl
])

# AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-

# Copyright (C) 2001-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
# $ac_aux_dir to '$srcdir/foo'.  In other projects, it is set to
# '$srcdir', '$srcdir/..', or '$srcdir/../..'.
#
# Of course, Automake must honor this variable whenever it calls a
# tool from the auxiliary directory.  The problem is that $srcdir (and
# therefore $ac_aux_dir as well) can be either absolute or relative,
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# harmless because $srcdir is '.', but things will broke when you
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AC_DEFUN([AM_AUX_DIR_EXPAND],
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# Expand $ac_aux_dir to an absolute path.
am_aux_dir=`cd "$ac_aux_dir" && pwd`
])

# AM_CONDITIONAL                                            -*- Autoconf -*-

# Copyright (C) 1997-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_CONDITIONAL(NAME, SHELL-CONDITION)
# -------------------------------------
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AC_SUBST([$1_FALSE])dnl
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m4_define([_AM_COND_VALUE_$1], [$2])dnl
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AC_CONFIG_COMMANDS_PRE(
[if test -z "${$1_TRUE}" && test -z "${$1_FALSE}"; then
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fi])])

# Copyright (C) 1999-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.


# There are a few dirty hacks below to avoid letting 'AC_PROG_CC' be
# written in clear, in which case automake, when reading aclocal.m4,
# will think it sees a *use*, and therefore will trigger all it's
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# _AM_DEPENDENCIES(NAME)
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# We don't AC_REQUIRE the corresponding AC_PROG_CC since the latter was
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AC_REQUIRE([AM_MAKE_INCLUDE])dnl
AC_REQUIRE([AM_DEP_TRACK])dnl

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# Generate code to set up dependency tracking.              -*- Autoconf -*-

# Copyright (C) 1999-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
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# Copyright (C) 1996-2014 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# Do all the work for Automake.                             -*- Autoconf -*-

# Copyright (C) 1996-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
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# Copyright (C) 2001-2014 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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#
# This file is free software; the Free Software Foundation
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# Add --enable-maintainer-mode option to configure.         -*- Autoconf -*-
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# Copyright (C) 1996-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
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# Copyright (C) 2001-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
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  # though they will create one.
  am_cv_prog_cc_c_o=yes
  for am_i in 1 2; do
    if AM_RUN_LOG([$CC -c conftest.$ac_ext -o conftest2.$ac_objext]) \
         && test -f conftest2.$ac_objext; then
      : OK
    else
      am_cv_prog_cc_c_o=no
      break
    fi
  done
  rm -f core conftest*
  unset am_i])
if test "$am_cv_prog_cc_c_o" != yes; then
   # Losing compiler, so override with the script.
   # FIXME: It is wrong to rewrite CC.
   # But if we don't then we get into trouble of one sort or another.
   # A longer-term fix would be to have automake use am__CC in this case,
   # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
   CC="$am_aux_dir/compile $CC"
fi
AC_LANG_POP([C])])

# For backward compatibility.
AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])

# Copyright (C) 2001-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_RUN_LOG(COMMAND)
# -------------------
# Run COMMAND, save the exit status in ac_status, and log it.
# (This has been adapted from Autoconf's _AC_RUN_LOG macro.)
AC_DEFUN([AM_RUN_LOG],
[{ echo "$as_me:$LINENO: $1" >&AS_MESSAGE_LOG_FD
   ($1) >&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD
   ac_status=$?
   echo "$as_me:$LINENO: \$? = $ac_status" >&AS_MESSAGE_LOG_FD
   (exit $ac_status); }])

# Check to make sure that the build environment is sane.    -*- Autoconf -*-

# Copyright (C) 1996-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_SANITY_CHECK
# ---------------
AC_DEFUN([AM_SANITY_CHECK],
[AC_MSG_CHECKING([whether build environment is sane])
# Reject unsafe characters in $srcdir or the absolute working directory
# name.  Accept space and tab only in the latter.
am_lf='
'
case `pwd` in
  *[[\\\"\#\$\&\'\`$am_lf]]*)
    AC_MSG_ERROR([unsafe absolute working directory name]);;
esac
case $srcdir in
  *[[\\\"\#\$\&\'\`$am_lf\ \	]]*)
    AC_MSG_ERROR([unsafe srcdir value: '$srcdir']);;
esac

# Do 'set' in a subshell so we don't clobber the current shell's
# arguments.  Must try -L first in case configure is actually a
# symlink; some systems play weird games with the mod time of symlinks
# (eg FreeBSD returns the mod time of the symlink's containing
# directory).
if (
   am_has_slept=no
   for am_try in 1 2; do
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     set X `ls -Lt "$srcdir/configure" conftest.file 2> /dev/null`
     if test "$[*]" = "X"; then
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	set X `ls -t "$srcdir/configure" conftest.file`
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	# If neither matched, then we have a broken ls.  This can happen
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	AC_MSG_ERROR([ls -t appears to fail.  Make sure there is not a broken
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     fi
     if test "$[2]" = conftest.file || test $am_try -eq 2; then
       break
     fi
     # Just in case.
     sleep 1
     am_has_slept=yes
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   test "$[2]" = conftest.file
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then
   # Ok.
   :
else
   AC_MSG_ERROR([newly created file is older than distributed files!
Check your system clock])
fi
AC_MSG_RESULT([yes])
# If we didn't sleep, we still need to ensure time stamps of config.status and
# generated files are strictly newer.
am_sleep_pid=
if grep 'slept: no' conftest.file >/dev/null 2>&1; then
  ( sleep 1 ) &
  am_sleep_pid=$!
fi
AC_CONFIG_COMMANDS_PRE(
  [AC_MSG_CHECKING([that generated files are newer than configure])
   if test -n "$am_sleep_pid"; then
     # Hide warnings about reused PIDs.
     wait $am_sleep_pid 2>/dev/null
   fi
   AC_MSG_RESULT([done])])
rm -f conftest.file
])

# Copyright (C) 2009-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_SILENT_RULES([DEFAULT])
# --------------------------
# Enable less verbose build rules; with the default set to DEFAULT
# ("yes" being less verbose, "no" or empty being verbose).
AC_DEFUN([AM_SILENT_RULES],
[AC_ARG_ENABLE([silent-rules], [dnl
AS_HELP_STRING(
  [--enable-silent-rules],
  [less verbose build output (undo: "make V=1")])
AS_HELP_STRING(
  [--disable-silent-rules],
  [verbose build output (undo: "make V=0")])dnl
])
case $enable_silent_rules in @%:@ (((
  yes) AM_DEFAULT_VERBOSITY=0;;
   no) AM_DEFAULT_VERBOSITY=1;;
    *) AM_DEFAULT_VERBOSITY=m4_if([$1], [yes], [0], [1]);;
esac
dnl
dnl A few 'make' implementations (e.g., NonStop OS and NextStep)
dnl do not support nested variable expansions.
dnl See automake bug#9928 and bug#10237.
am_make=${MAKE-make}
AC_CACHE_CHECK([whether $am_make supports nested variables],
   [am_cv_make_support_nested_variables],
   [if AS_ECHO([['TRUE=$(BAR$(V))
BAR0=false
BAR1=true
V=1
am__doit:
	@$(TRUE)
.PHONY: am__doit']]) | $am_make -f - >/dev/null 2>&1; then
  am_cv_make_support_nested_variables=yes
else
  am_cv_make_support_nested_variables=no
fi])
if test $am_cv_make_support_nested_variables = yes; then
  dnl Using '$V' instead of '$(V)' breaks IRIX make.
  AM_V='$(V)'
  AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
else
  AM_V=$AM_DEFAULT_VERBOSITY
  AM_DEFAULT_V=$AM_DEFAULT_VERBOSITY
fi
AC_SUBST([AM_V])dnl
AM_SUBST_NOTMAKE([AM_V])dnl
AC_SUBST([AM_DEFAULT_V])dnl
AM_SUBST_NOTMAKE([AM_DEFAULT_V])dnl
AC_SUBST([AM_DEFAULT_VERBOSITY])dnl
AM_BACKSLASH='\'
AC_SUBST([AM_BACKSLASH])dnl
_AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
])

# Copyright (C) 2001-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# AM_PROG_INSTALL_STRIP
# ---------------------
# One issue with vendor 'install' (even GNU) is that you can't
# specify the program used to strip binaries.  This is especially
# annoying in cross-compiling environments, where the build's strip
# is unlikely to handle the host's binaries.
# Fortunately install-sh will honor a STRIPPROG variable, so we
# always use install-sh in "make install-strip", and initialize
# STRIPPROG with the value of the STRIP variable (set by the user).
AC_DEFUN([AM_PROG_INSTALL_STRIP],
[AC_REQUIRE([AM_PROG_INSTALL_SH])dnl
# Installed binaries are usually stripped using 'strip' when the user
# run "make install-strip".  However 'strip' might not be the right
# tool to use in cross-compilation environments, therefore Automake
# will honor the 'STRIP' environment variable to overrule this program.
dnl Don't test for $cross_compiling = yes, because it might be 'maybe'.
if test "$cross_compiling" != no; then
  AC_CHECK_TOOL([STRIP], [strip], :)
fi
INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
AC_SUBST([INSTALL_STRIP_PROGRAM])])

# Copyright (C) 2006-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# _AM_SUBST_NOTMAKE(VARIABLE)
# ---------------------------
# Prevent Automake from outputting VARIABLE = @VARIABLE@ in Makefile.in.
# This macro is traced by Automake.
AC_DEFUN([_AM_SUBST_NOTMAKE])

# AM_SUBST_NOTMAKE(VARIABLE)
# --------------------------
# Public sister of _AM_SUBST_NOTMAKE.
AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])

# Check how to create a tarball.                            -*- Autoconf -*-

# Copyright (C) 2004-2014 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# _AM_PROG_TAR(FORMAT)
# --------------------
# Check how to create a tarball in format FORMAT.
# FORMAT should be one of 'v7', 'ustar', or 'pax'.
#
# Substitute a variable $(am__tar) that is a command
# writing to stdout a FORMAT-tarball containing the directory
# $tardir.
#     tardir=directory && $(am__tar) > result.tar
#
# Substitute a variable $(am__untar) that extract such
# a tarball read from stdin.
#     $(am__untar) < result.tar
#
AC_DEFUN([_AM_PROG_TAR],
[# Always define AMTAR for backward compatibility.  Yes, it's still used
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AC_SUBST([AMTAR], ['$${TAR-tar}'])

# We'll loop over all known methods to create a tar archive until one works.
_am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none'

m4_if([$1], [v7],
  [am__tar='$${TAR-tar} chof - "$$tardir"' am__untar='$${TAR-tar} xf -'],

  [m4_case([$1],
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      am_gid=`id -g || echo unknown`
      AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format])
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         AC_MSG_RESULT([yes])
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         AC_MSG_RESULT([no])
         _am_tools=none
      fi
      AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format])
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         AC_MSG_RESULT([yes])
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        AC_MSG_RESULT([no])
        _am_tools=none
      fi],

  [pax],
    [],

  [m4_fatal([Unknown tar format])])

  AC_MSG_CHECKING([how to create a $1 tar archive])

  # Go ahead even if we have the value already cached.  We do so because we
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  _am_tools=${am_cv_prog_tar_$1-$_am_tools}

  for _am_tool in $_am_tools; do
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    gnutar)
      for _am_tar in tar gnutar gtar; do
        AM_RUN_LOG([$_am_tar --version]) && break
      done
      am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"'
      am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"'
      am__untar="$_am_tar -xf -"
      ;;
    plaintar)
      # Must skip GNU tar: if it does not support --format= it doesn't create
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      (tar --version) >/dev/null 2>&1 && continue
      am__tar='tar chf - "$$tardir"'
      am__tar_='tar chf - "$tardir"'
      am__untar='tar xf -'
      ;;
    pax)
      am__tar='pax -L -x $1 -w "$$tardir"'
      am__tar_='pax -L -x $1 -w "$tardir"'
      am__untar='pax -r'
      ;;
    cpio)
      am__tar='find "$$tardir" -print | cpio -o -H $1 -L'
      am__tar_='find "$tardir" -print | cpio -o -H $1 -L'
      am__untar='cpio -i -H $1 -d'
      ;;
    none)
      am__tar=false
      am__tar_=false
      am__untar=false
      ;;
    esac

    # If the value was cached, stop now.  We just wanted to have am__tar
    # and am__untar set.
    test -n "${am_cv_prog_tar_$1}" && break

    # tar/untar a dummy directory, and stop if the command works.
    rm -rf conftest.dir
    mkdir conftest.dir
    echo GrepMe > conftest.dir/file
    AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar])
    rm -rf conftest.dir
    if test -s conftest.tar; then
      AM_RUN_LOG([$am__untar <conftest.tar])
      AM_RUN_LOG([cat conftest.dir/file])
      grep GrepMe conftest.dir/file >/dev/null 2>&1 && break
    fi
  done
  rm -rf conftest.dir

  AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool])
  AC_MSG_RESULT([$am_cv_prog_tar_$1])])

AC_SUBST([am__tar])
AC_SUBST([am__untar])
]) # _AM_PROG_TAR

m4_include([m4/ac_func_fseeko.m4])
m4_include([m4/ax_append_flag.m4])
m4_include([m4/ax_c___attribute__.m4])
m4_include([m4/ax_cflags_warn_all.m4])
m4_include([m4/ax_check_compile_flag.m4])
m4_include([m4/ax_compare_version.m4])
m4_include([m4/ax_compiler_vendor.m4])
m4_include([m4/ax_cxx_bool.m4])
m4_include([m4/ax_cxx_namespace_std.m4])
m4_include([m4/ax_cxx_namespaces.m4])
m4_include([m4/ax_gcc_archflag.m4])
m4_include([m4/ax_gcc_x86_cpuid.m4])
m4_include([m4/ax_lang_compiler_ms.m4])
m4_include([m4/ax_opencl.m4])
m4_include([m4/ax_prefix_config_h.m4])
m4_include([m4/ax_prog_perl_version.m4])
m4_include([m4/ax_pthread.m4])
m4_include([m4/ax_require_defined.m4])
m4_include([m4/cxx_have_std_libs.m4])
m4_include([m4/framework.m4])
m4_include([m4/ld-version-script.m4])
m4_include([m4/libtool.m4])
m4_include([m4/ltoptions.m4])
m4_include([m4/ltsugar.m4])
m4_include([m4/ltversion.m4])
m4_include([m4/lt~obsolete.m4])
m4_include([m4/pkg.m4])