1# lib-ld.m4 serial 6
2dnl Copyright (C) 1996-2003, 2009-2014 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl Subroutines of libtool.m4,
8dnl with replacements s/_*LT_PATH/AC_LIB_PROG/ and s/lt_/acl_/ to avoid
9dnl collision with libtool.m4.
10
11dnl From libtool-2.4. Sets the variable with_gnu_ld to yes or no.
12AC_DEFUN([AC_LIB_PROG_LD_GNU],
13[AC_CACHE_CHECK([if the linker ($LD) is GNU ld], [acl_cv_prog_gnu_ld],
14[# I'd rather use --version here, but apparently some GNU lds only accept -v.
15case `$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  ;;
22esac])
23with_gnu_ld=$acl_cv_prog_gnu_ld
24])
25
26dnl From libtool-2.4. Sets the variable LD.
27AC_DEFUN([AC_LIB_PROG_LD],
28[AC_REQUIRE([AC_PROG_CC])dnl
29AC_REQUIRE([AC_CANONICAL_HOST])dnl
30
31AC_ARG_WITH([gnu-ld],
32    [AS_HELP_STRING([--with-gnu-ld],
33        [assume the C compiler uses GNU ld [default=no]])],
34    [test "$withval" = no || with_gnu_ld=yes],
35    [with_gnu_ld=no])dnl
36
37# Prepare PATH_SEPARATOR.
38# The user is always right.
39if 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=$PATH; sh -c :) >/dev/null 2>&1 \
46           || PATH_SEPARATOR=';'
47       }
48fi
49
50ac_prog=ld
51if test "$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
81elif test "$with_gnu_ld" = yes; then
82  AC_MSG_CHECKING([for GNU ld])
83else
84  AC_MSG_CHECKING([for non-GNU ld])
85fi
86AC_CACHE_VAL([acl_cv_path_LD],
87[if test -z "$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"
108else
109  acl_cv_path_LD="$LD" # Let the user override the test with a path.
110fi])
111LD="$acl_cv_path_LD"
112if test -n "$LD"; then
113  AC_MSG_RESULT([$LD])
114else
115  AC_MSG_RESULT([no])
116fi
117test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
118AC_LIB_PROG_LD_GNU
119])
120