Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/config/lib-ld.m4
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1 # lib-ld.m4 serial 9 2 dnl Copyright (C) 1996-2003, 2009-2019 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/_*LT_PATH/AC_LIB_PROG/ and s/lt_/acl_/ to avoid 9 dnl collision with libtool.m4. 10 11 dnl From libtool-2.4. 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 ($LD) is GNU ld], [acl_cv_prog_gnu_ld], 14 [# I'd rather use --version here, but apparently some GNU lds only accept -v. 15 case `$LD -v 2>&1 </dev/null` in 16 *GNU* | *'with BFD'*) 17 acl_cv_prog_gnu_ld=yes 18 ;; 19 *) 20 acl_cv_prog_gnu_ld=no 21 ;; 22 esac]) 23 with_gnu_ld=$acl_cv_prog_gnu_ld 24 ]) 25 26 dnl From libtool-2.4. Sets the variable LD. 27 AC_DEFUN([AC_LIB_PROG_LD], 28 [AC_REQUIRE([AC_PROG_CC])dnl 29 AC_REQUIRE([AC_CANONICAL_HOST])dnl 30 31 AC_ARG_WITH([gnu-ld], 32 [AS_HELP_STRING([--with-gnu-ld], 33 [assume the C compiler uses GNU ld [default=no]])], 34 [test "$withval" = no || with_gnu_ld=yes], 35 [with_gnu_ld=no])dnl 36 37 # Prepare PATH_SEPARATOR. 38 # The user is always right. 39 if 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=$PATH; sh -c :) >/dev/null 2>&1 \ 46 || PATH_SEPARATOR=';' 47 } 48 fi 49 50 if test -n "$LD"; then 51 AC_MSG_CHECKING([for ld]) 52 elif test "$GCC" = yes; then 53 AC_MSG_CHECKING([for ld used by $CC]) 54 elif test "$with_gnu_ld" = yes; then 55 AC_MSG_CHECKING([for GNU ld]) 56 else 57 AC_MSG_CHECKING([for non-GNU ld]) 58 fi 59 if test -n "$LD"; then 60 # Let the user override the test with a path. 61 : 62 else 63 AC_CACHE_VAL([acl_cv_path_LD], 64 [ 65 acl_cv_path_LD= # Final result of this test 66 ac_prog=ld # Program to search in $PATH 67 if test "$GCC" = yes; then 68 # Check if gcc -print-prog-name=ld gives a path. 69 case $host in 70 *-*-mingw*) 71 # gcc leaves a trailing carriage return which upsets mingw 72 acl_output=`($CC -print-prog-name=ld) 2>&5 | tr -d '\015'` ;; 73 *) 74 acl_output=`($CC -print-prog-name=ld) 2>&5` ;; 75 esac 76 case $acl_output in 77 # Accept absolute paths. 78 [[\\/]]* | ?:[[\\/]]*) 79 re_direlt='/[[^/]][[^/]]*/\.\./' 80 # Canonicalize the pathname of ld 81 acl_output=`echo "$acl_output" | sed 's%\\\\%/%g'` 82 while echo "$acl_output" | grep "$re_direlt" > /dev/null 2>&1; do 83 acl_output=`echo $acl_output | sed "s%$re_direlt%/%"` 84 done 85 # Got the pathname. No search in PATH is needed. 86 acl_cv_path_LD="$acl_output" 87 ac_prog= 88 ;; 89 "") 90 # If it fails, then pretend we aren't using GCC. 91 ;; 92 *) 93 # If it is relative, then search for the first ld in PATH. 94 with_gnu_ld=unknown 95 ;; 96 esac 97 fi 98 if test -n "$ac_prog"; then 99 # Search for $ac_prog in $PATH. 100 acl_save_ifs="$IFS"; IFS=$PATH_SEPARATOR 101 for ac_dir in $PATH; do 102 IFS="$acl_save_ifs" 103 test -z "$ac_dir" && ac_dir=. 104 if test -f "$ac_dir/$ac_prog" || test -f "$ac_dir/$ac_prog$ac_exeext"; then 105 acl_cv_path_LD="$ac_dir/$ac_prog" 106 # Check to see if the program is GNU ld. I'd rather use --version, 107 # but apparently some variants of GNU ld only accept -v. 108 # Break only if it was the GNU/non-GNU ld that we prefer. 109 case `"$acl_cv_path_LD" -v 2>&1 </dev/null` in 110 *GNU* | *'with BFD'*) 111 test "$with_gnu_ld" != no && break 112 ;; 113 *) 114 test "$with_gnu_ld" != yes && break 115 ;; 116 esac 117 fi 118 done 119 IFS="$acl_save_ifs" 120 fi 121 case $host in 122 *-*-aix*) 123 AC_COMPILE_IFELSE( 124 [AC_LANG_SOURCE( 125 [[#if defined __powerpc64__ || defined _ARCH_PPC64 126 int ok; 127 #else 128 error fail 129 #endif 130 ]])], 131 [# The compiler produces 64-bit code. Add option '-b64' so that the 132 # linker groks 64-bit object files. 133 case "$acl_cv_path_LD " in 134 *" -b64 "*) ;; 135 *) acl_cv_path_LD="$acl_cv_path_LD -b64" ;; 136 esac 137 ], []) 138 ;; 139 sparc64-*-netbsd*) 140 AC_COMPILE_IFELSE( 141 [AC_LANG_SOURCE( 142 [[#if defined __sparcv9 || defined __arch64__ 143 int ok; 144 #else 145 error fail 146 #endif 147 ]])], 148 [], 149 [# The compiler produces 32-bit code. Add option '-m elf32_sparc' 150 # so that the linker groks 32-bit object files. 151 case "$acl_cv_path_LD " in 152 *" -m elf32_sparc "*) ;; 153 *) acl_cv_path_LD="$acl_cv_path_LD -m elf32_sparc" ;; 154 esac 155 ]) 156 ;; 157 esac 158 ]) 159 LD="$acl_cv_path_LD" 160 fi 161 if test -n "$LD"; then 162 AC_MSG_RESULT([$LD]) 163 else 164 AC_MSG_RESULT([no]) 165 AC_MSG_ERROR([no acceptable ld found in \$PATH]) 166 fi 167 AC_LIB_PROG_LD_GNU 168 ])
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