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1 office 1 # lib-ld.m4 serial 6
2 dnl Copyright (C) 1996-2003, 2009-2016 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 ])