m4/lib-ld.m4

   1 # lib-ld.m4 serial 5 (gettext-0.18.2)
   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/AC_/AC_LIB/ and s/lt_cv/acl_cv/ to avoid collision
   9 dnl with libtool.m4.
  10
  11 dnl From libtool-1.4. 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 ($LD) is GNU ld], [acl_cv_prog_gnu_ld],
  14 [# I'd rather use --version here, but apparently some GNU ld's only accept -v.
  15 case `$LD -v 2>&1 </dev/null` in
  16 *GNU* | *'with BFD'*)
  17   acl_cv_prog_gnu_ld=yes ;;
  18 *)
  19   acl_cv_prog_gnu_ld=no ;;
  20 esac])
  21 with_gnu_ld=$acl_cv_prog_gnu_ld
  22 ])
  23
  24 dnl From libtool-1.4. Sets the variable LD.
  25 AC_DEFUN([AC_LIB_PROG_LD],
  26 [AC_ARG_WITH([gnu-ld],
  27 [  --with-gnu-ld           assume the C compiler uses GNU ld [default=no]],
  28 test "$withval" = no || with_gnu_ld=yes, with_gnu_ld=no)
  29 AC_REQUIRE([AC_PROG_CC])dnl
  30 AC_REQUIRE([AC_CANONICAL_HOST])dnl
  31 # Prepare PATH_SEPARATOR.
  32 # The user is always right.
  33 if test "${PATH_SEPARATOR+set}" != set; then
  34   # Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which
  35   # contains only /bin. Note that ksh looks also at the FPATH variable,
  36   # so we have to set that as well for the test.
  37   PATH_SEPARATOR=:
  38   (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
  39     && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
  40            || PATH_SEPARATOR=';'
  41        }
  42 fi
  43 ac_prog=ld
  44 if test "$GCC" = yes; then
  45   # Check if gcc -print-prog-name=ld gives a path.
  46   AC_MSG_CHECKING([for ld used by GCC])
  47   case $host in
  48   *-*-mingw*)
  49     # gcc leaves a trailing carriage return which upsets mingw
  50     ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
  51   *)
  52     ac_prog=`($CC -print-prog-name=ld) 2>&5` ;;
  53   esac
  54   case $ac_prog in
  55     # Accept absolute paths.
  56     [[\\/]* | [A-Za-z]:[\\/]*)]
  57       [re_direlt='/[^/][^/]*/\.\./']
  58       # Canonicalize the path of ld
  59       ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
  60       while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
  61         ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
  62       done
  63       test -z "$LD" && LD="$ac_prog"
  64       ;;
  65   "")
  66     # If it fails, then pretend we aren't using GCC.
  67     ac_prog=ld
  68     ;;
  69   *)
  70     # If it is relative, then search for the first ld in PATH.
  71     with_gnu_ld=unknown
  72     ;;
  73   esac
  74 elif test "$with_gnu_ld" = yes; then
  75   AC_MSG_CHECKING([for GNU ld])
  76 else
  77   AC_MSG_CHECKING([for non-GNU ld])
  78 fi
  79 AC_CACHE_VAL([acl_cv_path_LD],
  80 [if test -z "$LD"; then
  81   IFS="${IFS=   }"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
  82   for ac_dir in $PATH; do
  83     test -z "$ac_dir" && ac_dir=.
  84     if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
  85       acl_cv_path_LD="$ac_dir/$ac_prog"
  86       # Check to see if the program is GNU ld.  I'd rather use --version,
  87       # but apparently some GNU ld's only accept -v.
  88       # Break only if it was the GNU/non-GNU ld that we prefer.
  89       case `"$acl_cv_path_LD" -v 2>&1 < /dev/null` in
  90       *GNU* | *'with BFD'*)
  91         test "$with_gnu_ld" != no && break ;;
  92       *)
  93         test "$with_gnu_ld" != yes && break ;;
  94       esac
  95     fi
  96   done
  97   IFS="$ac_save_ifs"
  98 else
  99   acl_cv_path_LD="$LD" # Let the user override the test with a path.
 100 fi])
 101 LD="$acl_cv_path_LD"
 102 if test -n "$LD"; then
 103   AC_MSG_RESULT([$LD])
 104 else
 105   AC_MSG_RESULT([no])
 106 fi
 107 test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
 108 AC_LIB_PROG_LD_GNU
 109 ])