tools/missing-macros/src/m4/lib-ld.m4

   1 # lib-ld.m4 serial 4 (gettext-0.18)
   2 dnl Copyright (C) 1996-2003, 2009-2010 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   echo "#! /bin/sh" >conf$$.sh
  35   echo  "exit 0"   >>conf$$.sh
  36   chmod +x conf$$.sh
  37   if (PATH="/nonexistent;."; conf$$.sh) >/dev/null 2>&1; then
  38     PATH_SEPARATOR=';'
  39   else
  40     PATH_SEPARATOR=:
  41   fi
  42   rm -f conf$$.sh
  43 fi
  44 ac_prog=ld
  45 if test "$GCC" = yes; then
  46   # Check if gcc -print-prog-name=ld gives a path.
  47   AC_MSG_CHECKING([for ld used by GCC])
  48   case $host in
  49   *-*-mingw*)
  50     # gcc leaves a trailing carriage return which upsets mingw
  51     ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
  52   *)
  53     ac_prog=`($CC -print-prog-name=ld) 2>&5` ;;
  54   esac
  55   case $ac_prog in
  56     # Accept absolute paths.
  57     [[\\/]* | [A-Za-z]:[\\/]*)]
  58       [re_direlt='/[^/][^/]*/\.\./']
  59       # Canonicalize the path of ld
  60       ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
  61       while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
  62         ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
  63       done
  64       test -z "$LD" && LD="$ac_prog"
  65       ;;
  66   "")
  67     # If it fails, then pretend we aren't using GCC.
  68     ac_prog=ld
  69     ;;
  70   *)
  71     # If it is relative, then search for the first ld in PATH.
  72     with_gnu_ld=unknown
  73     ;;
  74   esac
  75 elif test "$with_gnu_ld" = yes; then
  76   AC_MSG_CHECKING([for GNU ld])
  77 else
  78   AC_MSG_CHECKING([for non-GNU ld])
  79 fi
  80 AC_CACHE_VAL([acl_cv_path_LD],
  81 [if test -z "$LD"; then
  82   IFS="${IFS=   }"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
  83   for ac_dir in $PATH; do
  84     test -z "$ac_dir" && ac_dir=.
  85     if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
  86       acl_cv_path_LD="$ac_dir/$ac_prog"
  87       # Check to see if the program is GNU ld.  I'd rather use --version,
  88       # but apparently some GNU ld's only accept -v.
  89       # Break only if it was the GNU/non-GNU ld that we prefer.
  90       case `"$acl_cv_path_LD" -v 2>&1 < /dev/null` in
  91       *GNU* | *'with BFD'*)
  92         test "$with_gnu_ld" != no && break ;;
  93       *)
  94         test "$with_gnu_ld" != yes && break ;;
  95       esac
  96     fi
  97   done
  98   IFS="$ac_save_ifs"
  99 else
 100   acl_cv_path_LD="$LD" # Let the user override the test with a path.
 101 fi])
 102 LD="$acl_cv_path_LD"
 103 if test -n "$LD"; then
 104   AC_MSG_RESULT([$LD])
 105 else
 106   AC_MSG_RESULT([no])
 107 fi
 108 test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
 109 AC_LIB_PROG_LD_GNU
 110 ])