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 1 #·lib-ld.m4·serial·12
 2 dnl·Copyright·(C)·1996-2003,·2009-2023·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 dnl·Subroutines·of·libtool.m4,
 7 dnl·with·replacements·s/_*LT_PATH/AC_LIB_PROG/·and·s/lt_/acl_/·to·avoid
 8 dnl·collision·with·libtool.m4.
  
 9 dnl·From·libtool-2.4.·Sets·the·variable·with_gnu_ld·to·yes·or·no.
 10 AC_DEFUN([AC_LIB_PROG_LD_GNU],
 11 [AC_CACHE_CHECK([if·the·linker·($LD)·is·GNU·ld],·[acl_cv_prog_gnu_ld],
 12 [#·I'd·rather·use·--version·here,·but·apparently·some·GNU·lds·only·accept·-v.
 13 case·`$LD·-v·2>&1·</dev/null`·in
 14 *GNU*·|·*'with·BFD'*)
 15 ··acl_cv_prog_gnu_ld=yes
 16 ··;;
 17 *)
 18 ··acl_cv_prog_gnu_ld=no
 19 ··;;
 20 esac])
 21 with_gnu_ld=$acl_cv_prog_gnu_ld
 22 ])
  
 23 dnl·From·libtool-2.4.·Sets·the·variable·LD.
 24 AC_DEFUN([AC_LIB_PROG_LD],
 25 [AC_REQUIRE([AC_PROG_CC])dnl
 26 AC_REQUIRE([AC_CANONICAL_HOST])dnl
  
 27 AC_ARG_WITH([gnu-ld],
 28 ····[AS_HELP_STRING([[--with-gnu-ld]],
 29 ········[assume·the·C·compiler·uses·GNU·ld·[default=no]])],
 30 ····[test·"$withval"·=·no·||·with_gnu_ld=yes],
 31 ····[with_gnu_ld=no])dnl
  
 32 #·Prepare·PATH_SEPARATOR.
 33 #·The·user·is·always·right.
 34 if·test·"${PATH_SEPARATOR+set}"·!=·set;·then
 35 ··#·Determine·PATH_SEPARATOR·by·trying·to·find·/bin/sh·in·a·PATH·which
 36 ··#·contains·only·/bin.·Note·that·ksh·looks·also·at·the·FPATH·variable,
 37 ··#·so·we·have·to·set·that·as·well·for·the·test.
 38 ··PATH_SEPARATOR=:
 39 ··(PATH='/bin;/bin';·FPATH=$PATH;·sh·-c·:)·>/dev/null·2>&1·\
 40 ····&&·{·(PATH='/bin:/bin';·FPATH=$PATH;·sh·-c·:)·>/dev/null·2>&1·\
 41 ···········||·PATH_SEPARATOR=';'
 42 ·······}
 43 fi
  
 44 if·test·-n·"$LD";·then
 45 ··AC_MSG_CHECKING([for·ld])
 46 elif·test·"$GCC"·=·yes;·then
 47 ··AC_MSG_CHECKING([for·ld·used·by·$CC])
 48 elif·test·"$with_gnu_ld"·=·yes;·then
 49 ··AC_MSG_CHECKING([for·GNU·ld])
 50 else
 51 ··AC_MSG_CHECKING([for·non-GNU·ld])
 52 fi
 53 if·test·-n·"$LD";·then
 54 ··#·Let·the·user·override·the·test·with·a·path.
 55 ··:
 56 else
 57 ··AC_CACHE_VAL([acl_cv_path_LD],
 58 ··[
 59 ····acl_cv_path_LD=·#·Final·result·of·this·test
 60 ····ac_prog=ld·#·Program·to·search·in·$PATH
 61 ····if·test·"$GCC"·=·yes;·then
 62 ······#·Check·if·gcc·-print-prog-name=ld·gives·a·path.
 63 ······case·$host·in
 64 ········*-*-mingw*·|·windows*)
 65 ··········#·gcc·leaves·a·trailing·carriage·return·which·upsets·mingw
 66 ··········acl_output=`($CC·-print-prog-name=ld)·2>&5·|·tr·-d·'\015'`·;;
 67 ········*)
 68 ··········acl_output=`($CC·-print-prog-name=ld)·2>&5`·;;
 69 ······esac
 70 ······case·$acl_output·in
 71 ········#·Accept·absolute·paths.
 72 ········[[\\/]]*·|·?:[[\\/]]*)
 73 ··········re_direlt='/[[^/]][[^/]]*/\.\./'
 74 ··········#·Canonicalize·the·pathname·of·ld
 75 ··········acl_output=`echo·"$acl_output"·|·sed·'s%\\\\%/%g'`
 76 ··········while·echo·"$acl_output"·|·grep·"$re_direlt"·>·/dev/null·2>&1;·do
 77 ············acl_output=`echo·$acl_output·|·sed·"s%$re_direlt%/%"`
 78 ··········done
 79 ··········#·Got·the·pathname.·No·search·in·PATH·is·needed.
 80 ··········acl_cv_path_LD="$acl_output"
 81 ··········ac_prog=
 82 ··········;;
 83 ········"")
 84 ··········#·If·it·fails,·then·pretend·we·aren't·using·GCC.
 85 ··········;;
 86 ········*)
 87 ··········#·If·it·is·relative,·then·search·for·the·first·ld·in·PATH.
 88 ··········with_gnu_ld=unknown
 89 ··········;;
 90 ······esac
 91 ····fi
 92 ····if·test·-n·"$ac_prog";·then
 93 ······#·Search·for·$ac_prog·in·$PATH.
 94 ······acl_save_ifs="$IFS";·IFS=$PATH_SEPARATOR
 95 ······for·ac_dir·in·$PATH;·do
 96 ········IFS="$acl_save_ifs"
 97 ········test·-z·"$ac_dir"·&&·ac_dir=.
 98 ········if·test·-f·"$ac_dir/$ac_prog"·||·test·-f·"$ac_dir/$ac_prog$ac_exeext";·then
 99 ··········acl_cv_path_LD="$ac_dir/$ac_prog"
 100 ··········#·Check·to·see·if·the·program·is·GNU·ld.··I'd·rather·use·--version,
 101 ··········#·but·apparently·some·variants·of·GNU·ld·only·accept·-v.
 102 ··········#·Break·only·if·it·was·the·GNU/non-GNU·ld·that·we·prefer.
 103 ··········case·`"$acl_cv_path_LD"·-v·2>&1·</dev/null`·in
 104 ············*GNU*·|·*'with·BFD'*)
 105 ··············test·"$with_gnu_ld"·!=·no·&&·break
 106 ··············;;
 107 ············*)
 108 ··············test·"$with_gnu_ld"·!=·yes·&&·break
 109 ··············;;
 110 ··········esac
 111 ········fi
 112 ······done
 113 ······IFS="$acl_save_ifs"
 114 ····fi
 115 ····case·$host·in
 116 ······*-*-aix*)
 117 ········AC_COMPILE_IFELSE(
 118 ··········[AC_LANG_SOURCE(
 119 ·············[[#if·defined·__powerpc64__·||·defined·__LP64__
 120 ················int·ok;
 121 ···············#else
 122 ················error·fail
 123 ···············#endif
 124 ·············]])],
 125 ··········[#·The·compiler·produces·64-bit·code.·Add·option·'-b64'·so·that·the
 126 ···········#·linker·groks·64-bit·object·files.
 127 ···········case·"$acl_cv_path_LD·"·in
 128 ·············*"·-b64·"*)·;;
 129 ·············*)·acl_cv_path_LD="$acl_cv_path_LD·-b64"·;;
 130 ···········esac
 131 ··········],·[])
 132 ········;;
 133 ······sparc64-*-netbsd*)
 134 ········AC_COMPILE_IFELSE(
 135 ··········[AC_LANG_SOURCE(
 136 ·············[[#if·defined·__sparcv9·||·defined·__arch64__
 137 ················int·ok;
 138 ···············#else
 139 ················error·fail
 140 ···············#endif
 141 ·············]])],
 142 ··········[],
 143 ··········[#·The·compiler·produces·32-bit·code.·Add·option·'-m·elf32_sparc'
 144 ···········#·so·that·the·linker·groks·32-bit·object·files.
 145 ···········case·"$acl_cv_path_LD·"·in
 146 ·············*"·-m·elf32_sparc·"*)·;;
 147 ·············*)·acl_cv_path_LD="$acl_cv_path_LD·-m·elf32_sparc"·;;
 148 ···········esac
 149 ··········])
 150 ········;;
 151 ····esac
 152 ··])
 153 ··LD="$acl_cv_path_LD"
 154 fi
 155 if·test·-n·"$LD";·then
 156 ··AC_MSG_RESULT([$LD])
 157 else
 158 ··AC_MSG_RESULT([no])
 159 ··AC_MSG_ERROR([no·acceptable·ld·found·in·\$PATH])
 160 fi
 161 AC_LIB_PROG_LD_GNU
 162 ])
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