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annotate m4/lib-ld.m4 @ 204:268458c79e9b

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more cleanup of the shared library interface, but still not fully thread safe
author Carl Byington <carl@five-ten-sg.com>
date Sat, 06 Jun 2009 11:39:02 -0700
parents 0b1766da9be8
children
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rev   line source
153
0b1766da9be8 use AM_ICONV for better portability of the library location.
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1 # lib-ld.m4 serial 2 (gettext-0.12)
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2 dnl Copyright (C) 1996-2003 Free Software Foundation, Inc.
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3 dnl This file is free software, distributed under the terms of the GNU
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4 dnl General Public License. As a special exception to the GNU General
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5 dnl Public License, this file may be distributed as part of a program
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6 dnl that contains a configuration script generated by Autoconf, under
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7 dnl the same distribution terms as the rest of that program.
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8
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9 dnl Subroutines of libtool.m4,
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10 dnl with replacements s/AC_/AC_LIB/ and s/lt_cv/acl_cv/ to avoid collision
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11 dnl with libtool.m4.
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12
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13 dnl From libtool-1.4. Sets the variable with_gnu_ld to yes or no.
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14 AC_DEFUN([AC_LIB_PROG_LD_GNU],
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15 [AC_CACHE_CHECK([if the linker ($LD) is GNU ld], acl_cv_prog_gnu_ld,
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16 [# I'd rather use --version here, but apparently some GNU ld's only accept -v.
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17 if $LD -v 2>&1 </dev/null | egrep '(GNU|with BFD)' 1>&5; then
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18 acl_cv_prog_gnu_ld=yes
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19 else
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20 acl_cv_prog_gnu_ld=no
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21 fi])
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22 with_gnu_ld=$acl_cv_prog_gnu_ld
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23 ])
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24
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25 dnl From libtool-1.4. Sets the variable LD.
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26 AC_DEFUN([AC_LIB_PROG_LD],
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27 [AC_ARG_WITH(gnu-ld,
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28 [ --with-gnu-ld assume the C compiler uses GNU ld [default=no]],
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29 test "$withval" = no || with_gnu_ld=yes, with_gnu_ld=no)
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30 AC_REQUIRE([AC_PROG_CC])dnl
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31 AC_REQUIRE([AC_CANONICAL_HOST])dnl
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32 # Prepare PATH_SEPARATOR.
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33 # The user is always right.
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34 if test "${PATH_SEPARATOR+set}" != set; then
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35 echo "#! /bin/sh" >conf$$.sh
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36 echo "exit 0" >>conf$$.sh
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37 chmod +x conf$$.sh
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38 if (PATH="/nonexistent;."; conf$$.sh) >/dev/null 2>&1; then
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39 PATH_SEPARATOR=';'
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40 else
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41 PATH_SEPARATOR=:
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42 fi
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43 rm -f conf$$.sh
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44 fi
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45 ac_prog=ld
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46 if test "$GCC" = yes; then
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47 # Check if gcc -print-prog-name=ld gives a path.
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48 AC_MSG_CHECKING([for ld used by GCC])
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49 case $host in
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50 *-*-mingw*)
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51 # gcc leaves a trailing carriage return which upsets mingw
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52 ac_prog=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;;
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53 *)
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54 ac_prog=`($CC -print-prog-name=ld) 2>&5` ;;
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55 esac
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56 case $ac_prog in
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57 # Accept absolute paths.
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58 [[\\/]* | [A-Za-z]:[\\/]*)]
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59 [re_direlt='/[^/][^/]*/\.\./']
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60 # Canonicalize the path of ld
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61 ac_prog=`echo $ac_prog| sed 's%\\\\%/%g'`
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62 while echo $ac_prog | grep "$re_direlt" > /dev/null 2>&1; do
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63 ac_prog=`echo $ac_prog| sed "s%$re_direlt%/%"`
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64 done
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65 test -z "$LD" && LD="$ac_prog"
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66 ;;
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67 "")
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68 # If it fails, then pretend we aren't using GCC.
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69 ac_prog=ld
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70 ;;
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71 *)
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72 # If it is relative, then search for the first ld in PATH.
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73 with_gnu_ld=unknown
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74 ;;
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75 esac
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76 elif test "$with_gnu_ld" = yes; then
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77 AC_MSG_CHECKING([for GNU ld])
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78 else
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79 AC_MSG_CHECKING([for non-GNU ld])
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80 fi
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81 AC_CACHE_VAL(acl_cv_path_LD,
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82 [if test -z "$LD"; then
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83 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}${PATH_SEPARATOR-:}"
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84 for ac_dir in $PATH; do
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85 test -z "$ac_dir" && ac_dir=.
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86 if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then
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87 acl_cv_path_LD="$ac_dir/$ac_prog"
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88 # Check to see if the program is GNU ld. I'd rather use --version,
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89 # but apparently some GNU ld's only accept -v.
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90 # Break only if it was the GNU/non-GNU ld that we prefer.
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91 if "$acl_cv_path_LD" -v 2>&1 < /dev/null | egrep '(GNU|with BFD)' > /dev/null; then
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92 test "$with_gnu_ld" != no && break
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93 else
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94 test "$with_gnu_ld" != yes && break
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95 fi
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96 fi
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97 done
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98 IFS="$ac_save_ifs"
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99 else
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100 acl_cv_path_LD="$LD" # Let the user override the test with a path.
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101 fi])
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102 LD="$acl_cv_path_LD"
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103 if test -n "$LD"; then
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104 AC_MSG_RESULT($LD)
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105 else
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106 AC_MSG_RESULT(no)
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107 fi
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108 test -z "$LD" && AC_MSG_ERROR([no acceptable ld found in \$PATH])
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109 AC_LIB_PROG_LD_GNU
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110 ])