Xiyue Deng | b09ee01 | 2013-05-24 13:51:29 -0700 | [diff] [blame] | 1 | # lib-ld.m4 serial 6 |
| 2 | dnl Copyright (C) 1996-2003, 2009-2012 Free Software Foundation, Inc. |
| 3 | dnl This file is free software; the Free Software Foundation |
| 4 | dnl gives unlimited permission to copy and/or distribute it, |
| 5 | dnl with or without modifications, as long as this notice is preserved. |
| 6 | |
| 7 | dnl Subroutines of libtool.m4, |
| 8 | dnl with replacements s/_*LT_PATH/AC_LIB_PROG/ and s/lt_/acl_/ to avoid |
| 9 | dnl collision with libtool.m4. |
| 10 | |
| 11 | dnl From libtool-2.4. Sets the variable with_gnu_ld to yes or no. |
| 12 | AC_DEFUN([AC_LIB_PROG_LD_GNU], |
| 13 | [AC_CACHE_CHECK([if the linker ($LD) is GNU ld], [acl_cv_prog_gnu_ld], |
| 14 | [# I'd rather use --version here, but apparently some GNU lds only accept -v. |
| 15 | case `$LD -v 2>&1 </dev/null` in |
| 16 | *GNU* | *'with BFD'*) |
| 17 | acl_cv_prog_gnu_ld=yes |
| 18 | ;; |
| 19 | *) |
| 20 | acl_cv_prog_gnu_ld=no |
| 21 | ;; |
| 22 | esac]) |
| 23 | with_gnu_ld=$acl_cv_prog_gnu_ld |
| 24 | ]) |
| 25 | |
| 26 | dnl From libtool-2.4. Sets the variable LD. |
| 27 | AC_DEFUN([AC_LIB_PROG_LD], |
| 28 | [AC_REQUIRE([AC_PROG_CC])dnl |
| 29 | AC_REQUIRE([AC_CANONICAL_HOST])dnl |
| 30 | |
| 31 | AC_ARG_WITH([gnu-ld], |
| 32 | [AS_HELP_STRING([--with-gnu-ld], |
| 33 | [assume the C compiler uses GNU ld [default=no]])], |
| 34 | [test "$withval" = no || with_gnu_ld=yes], |
| 35 | [with_gnu_ld=no])dnl |
| 36 | |
| 37 | # Prepare PATH_SEPARATOR. |
| 38 | # The user is always right. |
| 39 | if test "${PATH_SEPARATOR+set}" != set; then |
| 40 | # Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which |
| 41 | # contains only /bin. Note that ksh looks also at the FPATH variable, |
| 42 | # so we have to set that as well for the test. |
| 43 | PATH_SEPARATOR=: |
| 44 | (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \ |
| 45 | && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \ |
| 46 | || PATH_SEPARATOR=';' |
| 47 | } |
| 48 | fi |
| 49 | |
| 50 | ac_prog=ld |
| 51 | if test "$GCC" = yes; then |
| 52 | # Check if gcc -print-prog-name=ld gives a path. |
| 53 | AC_MSG_CHECKING([for ld used by $CC]) |
| 54 | case $host in |
| 55 | *-*-mingw*) |
| 56 | # gcc leaves a trailing carriage return which upsets mingw |
| 57 | ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;; |
| 58 | *) |
| 59 | ac_prog=`($CC -print-prog-name=ld) 2>&5` ;; |
| 60 | esac |
| 61 | case $ac_prog in |
| 62 | # Accept absolute paths. |
| 63 | [[\\/]]* | ?:[[\\/]]*) |
| 64 | re_direlt='/[[^/]][[^/]]*/\.\./' |
| 65 | # Canonicalize the pathname of ld |
| 66 | ac_prog=`echo "$ac_prog"| sed 's%\\\\%/%g'` |
| 67 | while echo "$ac_prog" | grep "$re_direlt" > /dev/null 2>&1; do |
| 68 | ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"` |
| 69 | done |
| 70 | test -z "$LD" && LD="$ac_prog" |
| 71 | ;; |
| 72 | "") |
| 73 | # If it fails, then pretend we aren't using GCC. |
| 74 | ac_prog=ld |
| 75 | ;; |
| 76 | *) |
| 77 | # If it is relative, then search for the first ld in PATH. |
| 78 | with_gnu_ld=unknown |
| 79 | ;; |
| 80 | esac |
| 81 | elif test "$with_gnu_ld" = yes; then |
| 82 | AC_MSG_CHECKING([for GNU ld]) |
| 83 | else |
| 84 | AC_MSG_CHECKING([for non-GNU ld]) |
| 85 | fi |
| 86 | AC_CACHE_VAL([acl_cv_path_LD], |
| 87 | [if test -z "$LD"; then |
| 88 | acl_save_ifs="$IFS"; IFS=$PATH_SEPARATOR |
| 89 | for ac_dir in $PATH; do |
| 90 | IFS="$acl_save_ifs" |
| 91 | test -z "$ac_dir" && ac_dir=. |
| 92 | if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then |
| 93 | acl_cv_path_LD="$ac_dir/$ac_prog" |
| 94 | # Check to see if the program is GNU ld. I'd rather use --version, |
| 95 | # but apparently some variants of GNU ld only accept -v. |
| 96 | # Break only if it was the GNU/non-GNU ld that we prefer. |
| 97 | case `"$acl_cv_path_LD" -v 2>&1 </dev/null` in |
| 98 | *GNU* | *'with BFD'*) |
| 99 | test "$with_gnu_ld" != no && break |
| 100 | ;; |
| 101 | *) |
| 102 | test "$with_gnu_ld" != yes && break |
| 103 | ;; |
| 104 | esac |
| 105 | fi |
| 106 | done |
| 107 | IFS="$acl_save_ifs" |
| 108 | else |
| 109 | acl_cv_path_LD="$LD" # Let the user override the test with a path. |
| 110 | fi]) |
| 111 | LD="$acl_cv_path_LD" |
| 112 | if test -n "$LD"; then |
| 113 | AC_MSG_RESULT([$LD]) |
| 114 | else |
| 115 | AC_MSG_RESULT([no]) |
| 116 | fi |
| 117 | test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH]) |
| 118 | AC_LIB_PROG_LD_GNU |
| 119 | ]) |