| #!/bin/sh |
| |
| usage () { |
| cat <<EOF |
| Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET] |
| |
| To assign environment variables (e.g., CC, CFLAGS...), specify them as |
| VAR=VALUE. See below for descriptions of some of the useful variables. |
| |
| Defaults for the options are specified in brackets. |
| |
| Configuration: |
| --srcdir=DIR source directory [detected] |
| |
| Installation directories: |
| --prefix=PREFIX main installation prefix [/usr/local/musl] |
| --exec-prefix=EPREFIX installation prefix for executable files [PREFIX] |
| |
| Fine tuning of the installation directories: |
| --bindir=DIR user executables [EPREFIX/bin] |
| --libdir=DIR library files for the linker [PREFIX/lib] |
| --includedir=DIR include files for the C compiler [PREFIX/include] |
| --syslibdir=DIR location for the dynamic linker [/lib] |
| |
| System types: |
| --target=TARGET configure to run on target TARGET [detected] |
| --host=HOST same as --target |
| --build=BUILD build system type; used only to infer cross-compiling |
| |
| Optional features: |
| --enable-optimize=... optimize listed components for speed over size [auto] |
| --enable-debug build with debugging information [disabled] |
| --enable-warnings build with recommended warnings flags [disabled] |
| --enable-visibility use global visibility options to optimize PIC [no] |
| --enable-wrapper=... build given musl toolchain wrapper [auto] |
| --disable-shared inhibit building shared library [enabled] |
| --disable-static inhibit building static library [enabled] |
| |
| Some influential environment variables: |
| CC C compiler command [detected] |
| CFLAGS C compiler flags [-Os -pipe ...] |
| CROSS_COMPILE prefix for cross compiler and tools [none] |
| LIBCC compiler runtime library [detected] |
| |
| Use these variables to override the choices made by configure. |
| |
| EOF |
| exit 0 |
| } |
| |
| # Helper functions |
| |
| quote () { |
| tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; } |
| $1 |
| EOF |
| printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" |
| } |
| echo () { printf "%s\n" "$*" ; } |
| fail () { echo "$*" ; exit 1 ; } |
| fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; } |
| cmdexists () { type "$1" >/dev/null 2>&1 ; } |
| trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; } |
| |
| stripdir () { |
| while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done |
| } |
| |
| trycppif () { |
| printf "checking preprocessor condition %s... " "$1" |
| echo "typedef int x;" > "$tmpc" |
| echo "#if $1" >> "$tmpc" |
| echo "#error yes" >> "$tmpc" |
| echo "#endif" >> "$tmpc" |
| if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "false\n" |
| return 1 |
| else |
| printf "true\n" |
| return 0 |
| fi |
| } |
| |
| tryflag () { |
| printf "checking whether compiler accepts %s... " "$2" |
| echo "typedef int x;" > "$tmpc" |
| if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "yes\n" |
| eval "$1=\"\${$1} \$2\"" |
| eval "$1=\${$1# }" |
| return 0 |
| else |
| printf "no\n" |
| return 1 |
| fi |
| } |
| |
| tryldflag () { |
| printf "checking whether linker accepts %s... " "$2" |
| echo "typedef int x;" > "$tmpc" |
| if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "yes\n" |
| eval "$1=\"\${$1} \$2\"" |
| eval "$1=\${$1# }" |
| return 0 |
| else |
| printf "no\n" |
| return 1 |
| fi |
| } |
| |
| |
| |
| # Beginning of actual script |
| |
| CFLAGS_C99FSE= |
| CFLAGS_AUTO= |
| CFLAGS_MEMOPS= |
| CFLAGS_NOSSP= |
| CFLAGS_TRY= |
| LDFLAGS_AUTO= |
| LDFLAGS_TRY= |
| OPTIMIZE_GLOBS= |
| srcdir= |
| prefix=/usr/local/musl |
| exec_prefix='$(prefix)' |
| bindir='$(exec_prefix)/bin' |
| libdir='$(prefix)/lib' |
| includedir='$(prefix)/include' |
| syslibdir='/lib' |
| tools= |
| tool_libs= |
| build= |
| target= |
| optimize=auto |
| debug=no |
| warnings=no |
| visibility=no |
| shared=auto |
| static=yes |
| wrapper=auto |
| gcc_wrapper=no |
| clang_wrapper=no |
| |
| for arg ; do |
| case "$arg" in |
| --help|-h) usage ;; |
| --srcdir=*) srcdir=${arg#*=} ;; |
| --prefix=*) prefix=${arg#*=} ;; |
| --exec-prefix=*) exec_prefix=${arg#*=} ;; |
| --bindir=*) bindir=${arg#*=} ;; |
| --libdir=*) libdir=${arg#*=} ;; |
| --includedir=*) includedir=${arg#*=} ;; |
| --syslibdir=*) syslibdir=${arg#*=} ;; |
| --enable-shared|--enable-shared=yes) shared=yes ;; |
| --disable-shared|--enable-shared=no) shared=no ;; |
| --enable-static|--enable-static=yes) static=yes ;; |
| --disable-static|--enable-static=no) static=no ;; |
| --enable-optimize) optimize=yes ;; |
| --enable-optimize=*) optimize=${arg#*=} ;; |
| --disable-optimize) optimize=no ;; |
| --enable-debug|--enable-debug=yes) debug=yes ;; |
| --disable-debug|--enable-debug=no) debug=no ;; |
| --enable-warnings|--enable-warnings=yes) warnings=yes ;; |
| --disable-warnings|--enable-warnings=no) warnings=no ;; |
| --enable-visibility=auto) visibility=auto ;; |
| --enable-visibility|--enable-visibility=yes) visibility=yes ;; |
| --disable-visibility|--enable-visibility=no) visibility=no ;; |
| --enable-wrapper|--enable-wrapper=yes) wrapper=detect ;; |
| --enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;; |
| --enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;; |
| --enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;; |
| --disable-wrapper|--enable-wrapper=no) wrapper=no ;; |
| --enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;; |
| --disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;; |
| --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;; |
| --host=*|--target=*) target=${arg#*=} ;; |
| --build=*) build=${arg#*=} ;; |
| -* ) echo "$0: unknown option $arg" ;; |
| CC=*) CC=${arg#*=} ;; |
| CFLAGS=*) CFLAGS=${arg#*=} ;; |
| CPPFLAGS=*) CPPFLAGS=${arg#*=} ;; |
| LDFLAGS=*) LDFLAGS=${arg#*=} ;; |
| CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;; |
| LIBCC=*) LIBCC=${arg#*=} ;; |
| *=*) ;; |
| *) build=$arg ; target=$arg ;; |
| esac |
| done |
| |
| for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do |
| stripdir $i |
| done |
| |
| # |
| # Get the source dir for out-of-tree builds |
| # |
| if test -z "$srcdir" ; then |
| srcdir="${0%/configure}" |
| stripdir srcdir |
| fi |
| abs_builddir="$(pwd)" || fail "$0: cannot determine working directory" |
| abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir" |
| test "$abs_srcdir" = "$abs_builddir" && srcdir=. |
| test "$srcdir" != "." -a -f Makefile -a ! -h Makefile && fail "$0: Makefile already exists in the working directory" |
| |
| # |
| # Get a temp filename we can use |
| # |
| i=0 |
| set -C |
| while : ; do i=$(($i+1)) |
| tmpc="./conf$$-$PPID-$i.c" |
| 2>|/dev/null > "$tmpc" && break |
| test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc" |
| done |
| set +C |
| trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP |
| |
| # |
| # Check whether we are cross-compiling, and set a default |
| # CROSS_COMPILE prefix if none was provided. |
| # |
| test "$target" && \ |
| test "$target" != "$build" && \ |
| test -z "$CROSS_COMPILE" && \ |
| CROSS_COMPILE="$target-" |
| |
| # |
| # Find a C compiler to use |
| # |
| printf "checking for C compiler... " |
| trycc ${CROSS_COMPILE}gcc |
| trycc ${CROSS_COMPILE}c99 |
| trycc ${CROSS_COMPILE}cc |
| printf "%s\n" "$CC" |
| test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; } |
| |
| printf "checking whether C compiler works... " |
| echo "typedef int x;" > "$tmpc" |
| if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then |
| printf "yes\n" |
| else |
| printf "no; compiler output follows:\n%s\n" "$output" |
| exit 1 |
| fi |
| |
| # |
| # Figure out options to force errors on unknown flags. |
| # |
| tryflag CFLAGS_TRY -Werror=unknown-warning-option |
| tryflag CFLAGS_TRY -Werror=unused-command-line-argument |
| tryflag CFLAGS_TRY -Werror=ignored-optimization-argument |
| tryldflag LDFLAGS_TRY -Werror=unknown-warning-option |
| tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument |
| |
| # |
| # Need to know if the compiler is gcc or clang to decide which toolchain |
| # wrappers to build. |
| # |
| printf "checking for C compiler family... " |
| cc_ver="$(LC_ALL=C $CC -v 2>&1)" |
| cc_family=unknown |
| if fnmatch '*gcc\ version*' "$cc_ver" ; then |
| cc_family=gcc |
| elif fnmatch '*clang\ version*' "$cc_ver" ; then |
| cc_family=clang |
| fi |
| echo "$cc_family" |
| |
| # |
| # Figure out toolchain wrapper to build |
| # |
| if test "$wrapper" = auto -o "$wrapper" = detect ; then |
| echo "#include <stdlib.h>" > "$tmpc" |
| echo "#if ! __GLIBC__" >> "$tmpc" |
| echo "#error no" >> "$tmpc" |
| echo "#endif" >> "$tmpc" |
| printf "checking for toolchain wrapper to build... " |
| if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| echo "none" |
| elif test "$cc_family" = gcc ; then |
| gcc_wrapper=yes |
| echo "gcc" |
| elif test "$cc_family" = clang ; then |
| clang_wrapper=yes |
| echo "clang" |
| else |
| echo "none" |
| if test "$wrapper" = detect ; then |
| fail "$0: could not find an appropriate toolchain wrapper" |
| fi |
| fi |
| fi |
| |
| if test "$gcc_wrapper" = yes ; then |
| tools="$tools obj/musl-gcc" |
| tool_libs="$tool_libs lib/musl-gcc.specs" |
| fi |
| if test "$clang_wrapper" = yes ; then |
| tools="$tools obj/musl-clang obj/ld.musl-clang" |
| fi |
| |
| # |
| # Find the target architecture |
| # |
| printf "checking target system type... " |
| test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown |
| printf "%s\n" "$target" |
| |
| # |
| # Convert to just ARCH |
| # |
| case "$target" in |
| # Catch these early to simplify matching for 32-bit archs |
| arm*) ARCH=arm ;; |
| aarch64*) ARCH=aarch64 ;; |
| i?86-nt32*) ARCH=nt32 ;; |
| i?86*) ARCH=i386 ;; |
| x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;; |
| x86_64-nt64*) ARCH=nt64 ;; |
| x86_64*) ARCH=x86_64 ;; |
| mips64*|mipsisa64*) ARCH=mips64 ;; |
| mips*) ARCH=mips ;; |
| microblaze*) ARCH=microblaze ;; |
| or1k*) ARCH=or1k ;; |
| powerpc64*) ARCH=powerpc64 ;; |
| powerpc*) ARCH=powerpc ;; |
| sh[1-9bel-]*|sh|superh*) ARCH=sh ;; |
| s390x*) ARCH=s390x ;; |
| unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; |
| *) fail "$0: unknown or unsupported target \"$target\"" ;; |
| esac |
| |
| # |
| # Try to get a conforming C99 freestanding environment |
| # |
| tryflag CFLAGS_C99FSE -std=c99 |
| tryflag CFLAGS_C99FSE -nostdinc |
| tryflag CFLAGS_C99FSE -ffreestanding \ |
| || tryflag CFLAGS_C99FSE -fno-builtin |
| tryflag CFLAGS_C99FSE -fexcess-precision=standard \ |
| || { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } |
| tryflag CFLAGS_C99FSE -frounding-math |
| |
| # |
| # We may use the may_alias attribute if __GNUC__ is defined, so |
| # if the compiler defines __GNUC__ but does not provide it, |
| # it must be defined away as part of the CFLAGS. |
| # |
| printf "checking whether compiler needs attribute((may_alias)) suppression... " |
| cat > "$tmpc" <<EOF |
| typedef int |
| #ifdef __GNUC__ |
| __attribute__((__may_alias__)) |
| #endif |
| x; |
| EOF |
| if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ |
| -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "no\n" |
| else |
| printf "yes\n" |
| CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" |
| fi |
| |
| # |
| # The GNU toolchain defaults to assuming unmarked files need an |
| # executable stack, potentially exposing vulnerabilities in programs |
| # linked with such object files. Fix this. |
| # |
| tryflag CFLAGS_C99FSE -Wa,--noexecstack |
| |
| # |
| # Check for options to disable stack protector, which needs to be |
| # disabled for a few early-bootstrap translation units. If not found, |
| # this is not an error; we assume the toolchain does not do ssp. |
| # |
| tryflag CFLAGS_NOSSP -fno-stack-protector |
| |
| # |
| # Check for options that may be needed to prevent the compiler from |
| # generating self-referential versions of memcpy,, memmove, memcmp, |
| # and memset. Really, we should add a check to determine if this |
| # option is sufficient, and if not, add a macro to cripple these |
| # functions with volatile... |
| # |
| tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns |
| |
| # |
| # Enable debugging if requessted. |
| # |
| test "$debug" = yes && CFLAGS_AUTO=-g |
| |
| # |
| # Preprocess asm files to add extra debugging information if debug is |
| # enabled, our assembler supports the needed directives, and the |
| # preprocessing script has been written for our architecture. |
| # |
| printf "checking whether we should preprocess assembly to add debugging information... " |
| if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" && |
| test -f "tools/add-cfi.$ARCH.awk" && |
| printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null - |
| then |
| ADD_CFI=yes |
| else |
| ADD_CFI=no |
| fi |
| printf "%s\n" "$ADD_CFI" |
| |
| # |
| # Possibly add a -O option to CFLAGS and select modules to optimize with |
| # -O3 based on the status of --enable-optimize and provided CFLAGS. |
| # |
| printf "checking for optimization settings... " |
| case "x$optimize" in |
| xauto) |
| if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then |
| printf "using provided CFLAGS\n" ;optimize=no |
| else |
| printf "using defaults\n" ; optimize=yes |
| fi |
| ;; |
| xsize|xnone) printf "minimize size\n" ; optimize=size ;; |
| xno|x) printf "disabled\n" ; optimize=no ;; |
| *) printf "custom\n" ;; |
| esac |
| |
| test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2 |
| test "$optimize" = yes && optimize="internal,malloc,string" |
| |
| if fnmatch 'no|size' "$optimize" ; then : |
| else |
| printf "components to be optimized for speed:" |
| while test "$optimize" ; do |
| case "$optimize" in |
| *,*) this=${optimize%%,*} optimize=${optimize#*,} ;; |
| *) this=$optimize optimize= |
| esac |
| printf " $this" |
| case "$this" in |
| */*.c) ;; |
| */*) this=$this*.c ;; |
| *) this=$this/*.c ;; |
| esac |
| OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" |
| done |
| OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } |
| printf "\n" |
| fi |
| |
| # Always try -pipe |
| tryflag CFLAGS_AUTO -pipe |
| |
| # |
| # If debugging is disabled, omit frame pointer. Modern GCC does this |
| # anyway on most archs even when debugging is enabled since the frame |
| # pointer is no longer needed for debugging. |
| # |
| if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : |
| else |
| tryflag CFLAGS_AUTO -fomit-frame-pointer |
| fi |
| |
| # |
| # Modern GCC wants to put DWARF tables (used for debugging and |
| # unwinding) in the loaded part of the program where they are |
| # unstrippable. These options force them back to debug sections (and |
| # cause them not to get generated at all if debugging is off). |
| # |
| tryflag CFLAGS_AUTO -fno-unwind-tables |
| tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables |
| |
| # |
| # Attempt to put each function and each data object in its own |
| # section. This both allows additional size optimizations at link |
| # time and works around a dangerous class of compiler/assembler bugs |
| # whereby relative address expressions are constant-folded by the |
| # assembler even when one or more of the symbols involved is |
| # replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc. |
| # |
| tryflag CFLAGS_AUTO -ffunction-sections |
| tryflag CFLAGS_AUTO -fdata-sections |
| |
| # |
| # On x86, make sure we don't have incompatible instruction set |
| # extensions enabled by default. This is bad for making static binaries. |
| # We cheat and use i486 rather than i386 because i386 really does not |
| # work anyway (issues with atomic ops). |
| # Some build environments pass -march and -mtune options via CC, so |
| # check both CC and CFLAGS. |
| # |
| if test "$ARCH" = "i386" ; then |
| fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 |
| fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic |
| fi |
| |
| # |
| # Even with -std=c99, gcc accepts some constructs which are constraint |
| # violations. We want to treat these as errors regardless of whether |
| # other purely stylistic warnings are enabled -- especially implicit |
| # function declarations, which are a dangerous programming error. |
| # |
| tryflag CFLAGS_AUTO -Werror=implicit-function-declaration |
| tryflag CFLAGS_AUTO -Werror=implicit-int |
| tryflag CFLAGS_AUTO -Werror=pointer-sign |
| tryflag CFLAGS_AUTO -Werror=pointer-arith |
| |
| # |
| # GCC ignores unused arguements by default, but Clang needs this extra |
| # parameter to stop printing warnings about LDFLAGS passed during |
| # compiling stage and CFLAGS passed during linking stage. |
| # |
| tryflag CFLAGS_AUTO -Qunused-arguments |
| |
| if test "x$warnings" = xyes ; then |
| tryflag CFLAGS_AUTO -Wall |
| tryflag CFLAGS_AUTO -Wno-parentheses |
| tryflag CFLAGS_AUTO -Wno-uninitialized |
| tryflag CFLAGS_AUTO -Wno-missing-braces |
| tryflag CFLAGS_AUTO -Wno-unused-value |
| tryflag CFLAGS_AUTO -Wno-unused-but-set-variable |
| tryflag CFLAGS_AUTO -Wno-unknown-pragmas |
| tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast |
| fi |
| |
| if test "x$visibility" = xauto ; then |
| # This test checks toolchain support for several things: |
| # - the -include option |
| # - the attributes/pragmas used in vis.h |
| # - linking code that takes the address of protected symbols |
| # - gcc 3.x bug that wrongly claims declarations mismatch |
| printf "checking whether global visibility preinclude works... " |
| cat > "$tmpc" <<EOF |
| __attribute__((__visibility__("default"))) |
| extern struct a *const x; |
| typedef struct a b; |
| extern b *const x; |
| b *const x; |
| int (*fp)(void); |
| int foo(void) { } |
| int bar(void) { fp = foo; return foo(); } |
| EOF |
| if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ |
| -DSHARED -fPIC -I$srcdir/src/internal -include vis.h \ |
| -nostdlib -shared -Wl,-Bsymbolic-functions \ |
| -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| visibility=yes |
| else |
| visibility=no |
| fi |
| printf "%s\n" "$visibility" |
| fi |
| |
| if test "x$visibility" = xyes ; then |
| CFLAGS_AUTO="$CFLAGS_AUTO -include vis.h" |
| CFLAGS_AUTO="${CFLAGS_AUTO# }" |
| fi |
| |
| # Determine if the compiler produces position-independent code (PIC) |
| # by default. If so, we don't need to compile separate object files |
| # for libc.a and libc.so. |
| if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then |
| pic_default=yes |
| else |
| pic_default=no |
| fi |
| |
| # Reduce space lost to padding for alignment purposes by sorting data |
| # objects according to their alignment reqirements. This approximates |
| # optimal packing. |
| tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment |
| tryldflag LDFLAGS_AUTO -Wl,--sort-common |
| |
| # When linking shared library, drop dummy weak definitions that were |
| # replaced by strong definitions from other translation units. |
| tryldflag LDFLAGS_AUTO -Wl,--gc-sections |
| |
| # Some patched GCC builds have these defaults messed up... |
| tryldflag LDFLAGS_AUTO -Wl,--hash-style=both |
| |
| # Prevent linking if there are undefined symbols; if any exist, |
| # libc.so will crash at runtime during relocation processing. |
| # The common way this can happen is failure to link the compiler |
| # runtime library; implementation error is also a possibility. |
| tryldflag LDFLAGS_AUTO -Wl,--no-undefined |
| |
| # Avoid exporting symbols from compiler runtime libraries. They |
| # should be hidden anyway, but some toolchains including old gcc |
| # versions built without shared library support and pcc are broken. |
| tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL |
| |
| # Public data symbols must be interposable to allow for copy |
| # relocations, but otherwise we want to bind symbols at libc link |
| # time to eliminate startup relocations and PLT overhead. Use |
| # --dynamic-list rather than -Bsymbolic-functions for greater |
| # control over what symbols are left unbound. |
| tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list" |
| |
| # Find compiler runtime library |
| test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh |
| test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt |
| test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \ |
| && tryldflag LIBCC "$try_libcc" |
| test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ |
| && tryldflag LIBCC "$try_libcc" |
| printf "using compiler runtime libraries: %s\n" "$LIBCC" |
| |
| # Figure out arch variants for archs with variants |
| SUBARCH= |
| t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" |
| |
| if test "$ARCH" = "x86_64" ; then |
| trycppif __ILP32__ "$t" && ARCH=x32 |
| fi |
| |
| if test "$ARCH" = "arm" ; then |
| if trycppif __thumb2__ "$t" ; then |
| tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always |
| tryflag CFLAGS_AUTO -Wa,-mthumb |
| fi |
| trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb |
| trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf |
| # Versions of clang up until at least 3.8 have the wrong constraint codes |
| # for floating point operands to inline asm. Detect this so the affected |
| # source files can just disable the asm. |
| if test "$cc_family" = clang ; then |
| printf "checking whether clang's vfp asm constraints work... " |
| echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc" |
| if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "yes\n" |
| else |
| printf "no\n" |
| CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM" |
| CFLAGS_AUTO="${CFLAGS_AUTO# }" |
| fi |
| fi |
| fi |
| |
| if test "$ARCH" = "aarch64" ; then |
| trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be |
| fi |
| |
| if test "$ARCH" = "mips" ; then |
| trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 |
| trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el |
| trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf |
| fi |
| |
| if test "$ARCH" = "mips64" ; then |
| trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32 |
| trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 |
| trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el |
| trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf |
| fi |
| |
| if test "$ARCH" = "powerpc" ; then |
| trycppif "__NO_FPRS__ && !_SOFT_FLOAT" "$t" && fail \ |
| "$0: error: compiler's floating point configuration is unsupported" |
| trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf |
| fi |
| |
| test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ |
| && SUBARCH=${SUBARCH}el |
| |
| if test "$ARCH" = "powerpc64" ; then |
| trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI" |
| trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le |
| trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64" |
| fi |
| |
| if test "$ARCH" = "sh" ; then |
| tryflag CFLAGS_AUTO -Wa,--isa=any |
| trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb |
| if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then |
| # Some sh configurations are broken and replace double with float |
| # rather than using softfloat when the fpu is present but only |
| # supports single precision. Reject them. |
| printf "checking whether compiler's double type is IEEE double... " |
| echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" |
| if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "yes\n" |
| else |
| printf "no\n" |
| fail "$0: error: compiler's floating point configuration is unsupported" |
| fi |
| else |
| SUBARCH=${SUBARCH}-nofpu |
| fi |
| if trycppif __SH_FDPIC__ "$t" ; then |
| SUBARCH=${SUBARCH}-fdpic |
| fi |
| fi |
| |
| test "$SUBARCH" \ |
| && printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" |
| |
| case "$ARCH$SUBARCH" in |
| arm) ASMSUBARCH=el ;; |
| *) ASMSUBARCH=$SUBARCH ;; |
| esac |
| |
| # |
| # Some archs (powerpc) have different possible long double formats |
| # that the compiler can be configured for. The logic for whether this |
| # is supported is in bits/float.h; in general, it is not. We need to |
| # check for mismatches here or code in printf, strotd, and scanf will |
| # be dangerously incorrect because it depends on (1) the macros being |
| # correct, and (2) IEEE semantics. |
| # |
| printf "checking whether compiler's long double definition matches float.h... " |
| echo '#include <float.h>' > "$tmpc" |
| echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc" |
| echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc" |
| if $CC $CFLAGS_C99FSE \ |
| -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \ |
| $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then |
| printf "yes\n" |
| else |
| printf "no\n" |
| fail "$0: error: unsupported long double type" |
| fi |
| |
| # |
| # Some build systems globally pass in broken CFLAGS like -ffast-math |
| # for all packages. On recent GCC we can detect this and error out |
| # early rather than producing a seriously-broken math library. |
| # |
| if trycppif "__FAST_MATH__" \ |
| "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then |
| fail "$0: error: compiler has broken floating point; check CFLAGS" |
| fi |
| |
| printf "creating config.mak... " |
| |
| cmdline=$(quote "$0") |
| for i ; do cmdline="$cmdline $(quote "$i")" ; done |
| |
| exec 3>&1 1>config.mak |
| |
| |
| cat << EOF |
| # This version of config.mak was generated by: |
| # $cmdline |
| # Any changes made here will be lost if configure is re-run |
| ARCH = $ARCH |
| SUBARCH = $SUBARCH |
| ASMSUBARCH = $ASMSUBARCH |
| srcdir = $srcdir |
| prefix = $prefix |
| exec_prefix = $exec_prefix |
| bindir = $bindir |
| libdir = $libdir |
| includedir = $includedir |
| syslibdir = $syslibdir |
| CC = $CC |
| CFLAGS = $CFLAGS |
| CFLAGS_AUTO = $CFLAGS_AUTO |
| CFLAGS_C99FSE = $CFLAGS_C99FSE |
| CFLAGS_MEMOPS = $CFLAGS_MEMOPS |
| CFLAGS_NOSSP = $CFLAGS_NOSSP |
| CPPFLAGS = $CPPFLAGS |
| LDFLAGS = $LDFLAGS |
| LDFLAGS_AUTO = $LDFLAGS_AUTO |
| CROSS_COMPILE = $CROSS_COMPILE |
| LIBCC = $LIBCC |
| OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS |
| ALL_TOOLS = $tools |
| TOOL_LIBS = $tool_libs |
| ADD_CFI = $ADD_CFI |
| EOF |
| test "x$static" = xno && echo "STATIC_LIBS =" |
| test "x$shared" = xno && echo "SHARED_LIBS =" |
| test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)' |
| test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)' |
| test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)' |
| exec 1>&3 3>&- |
| |
| test "$srcdir" = "." || ln -sf $srcdir/Makefile . |
| |
| printf "done\n" |