3 dnl Copyright (C) 1996-2003, 2009-2025 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
7 dnl This file is offered as-is, without any warranty.
9 dnl Subroutines of libtool.m4,
10 dnl with replacements s/_*LT_PATH/AC_LIB_PROG/ and s/lt_/acl_/ to avoid
11 dnl collision with libtool.m4.
13 dnl From libtool-2.4. Sets the variable with_gnu_ld to yes or no.
14 AC_DEFUN([AC_LIB_PROG_LD_GNU],
15 [AC_CACHE_CHECK([if the linker ($LD) is GNU ld], [acl_cv_prog_gnu_ld],
16 [# I'd rather use --version here, but apparently some GNU lds only accept -v.
17 case `$LD -v 2>&1 </dev/null` in
19 acl_cv_prog_gnu_ld=yes
25 with_gnu_ld=$acl_cv_prog_gnu_ld
28 dnl From libtool-2.4. Sets the variable LD.
29 AC_DEFUN([AC_LIB_PROG_LD],
30 [AC_REQUIRE([AC_PROG_CC])dnl
31 AC_REQUIRE([AC_CANONICAL_HOST])dnl
34 [AS_HELP_STRING([[--with-gnu-ld]],
35 [assume the C compiler uses GNU ld [default=no]])],
36 [test "$withval" = no || with_gnu_ld=yes],
39 # Prepare PATH_SEPARATOR.
40 # The user is always right.
41 if test "${PATH_SEPARATOR+set}" != set; then
42 # Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which
43 # contains only /bin. Note that ksh looks also at the FPATH variable,
44 # so we have to set that as well for the test.
46 (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
47 && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
52 if test -n "$LD"; then
53 AC_MSG_CHECKING([for ld])
54 elif test "$GCC" = yes; then
55 AC_MSG_CHECKING([for ld used by $CC])
56 elif test "$with_gnu_ld" = yes; then
57 AC_MSG_CHECKING([for GNU ld])
59 AC_MSG_CHECKING([for non-GNU ld])
61 if test -n "$LD"; then
62 # Let the user override the test with a path.
65 AC_CACHE_VAL([acl_cv_path_LD],
67 acl_cv_path_LD= # Final result of this test
68 ac_prog=ld # Program to search in $PATH
69 if test "$GCC" = yes; then
70 # Check if gcc -print-prog-name=ld gives a path.
72 *-*-mingw* | windows*)
73 # gcc leaves a trailing carriage return which upsets mingw
74 acl_output=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
76 acl_output=`($CC -print-prog-name=ld) 2>&5` ;;
79 # Accept absolute paths.
80 [[\\/]]* | ?:[[\\/]]*)
81 re_direlt='/[[^/]][[^/]]*/\.\./'
82 # Canonicalize the pathname of ld
83 acl_output=`echo "$acl_output" | sed 's%\\\\%/%g'`
84 while echo "$acl_output" | grep "$re_direlt" > /dev/null 2>&1; do
85 acl_output=`echo $acl_output | sed "s%$re_direlt%/%"`
87 # Got the pathname. No search in PATH is needed.
88 acl_cv_path_LD="$acl_output"
92 # If it fails, then pretend we aren't using GCC.
95 # If it is relative, then search for the first ld in PATH.
100 if test -n "$ac_prog"; then
101 # Search for $ac_prog in $PATH.
102 acl_saved_IFS="$IFS"; IFS=$PATH_SEPARATOR
103 for ac_dir in $PATH; do
105 test -z "$ac_dir" && ac_dir=.
106 if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
107 acl_cv_path_LD="$ac_dir/$ac_prog"
108 # Check to see if the program is GNU ld. I'd rather use --version,
109 # but apparently some variants of GNU ld only accept -v.
110 # Break only if it was the GNU/non-GNU ld that we prefer.
111 case `"$acl_cv_path_LD" -v 2>&1 </dev/null` in
112 *GNU* | *'with BFD'*)
113 test "$with_gnu_ld" != no && break
116 test "$with_gnu_ld" != yes && break
127 [[#if defined __powerpc64__ || defined __LP64__
133 [# The compiler produces 64-bit code. Add option '-b64' so that the
134 # linker groks 64-bit object files.
135 case "$acl_cv_path_LD " in
137 *) acl_cv_path_LD="$acl_cv_path_LD -b64" ;;
144 [[#if defined __sparcv9 || defined __arch64__
151 [# The compiler produces 32-bit code. Add option '-m elf32_sparc'
152 # so that the linker groks 32-bit object files.
153 case "$acl_cv_path_LD " in
154 *" -m elf32_sparc "*) ;;
155 *) acl_cv_path_LD="$acl_cv_path_LD -m elf32_sparc" ;;
163 if test -n "$LD"; then
167 AC_MSG_ERROR([no acceptable ld found in \$PATH])