1 # 2 # Get the linker version string. 3 # 4 # This macro is specific to LLVM. 5 # 6 AC_DEFUN([AC_LINK_GET_VERSION], 7 [AC_CACHE_CHECK([for linker version],[llvm_cv_link_version], 8 [ 9 version_string="$(ld -v 2>&1 | head -1)" 10 11 # Check for ld64. 12 if (echo "$version_string" | grep -q "ld64"); then 13 llvm_cv_link_version=$(echo "$version_string" | sed -e "s#.*ld64-\([^ ]*\)#\1#") 14 else 15 llvm_cv_link_version=$(echo "$version_string" | sed -e "s#[^0-9]*\([0-9.]*\).*#\1#") 16 fi 17 ]) 18 AC_DEFINE_UNQUOTED([HOST_LINK_VERSION],"$llvm_cv_link_version", 19 [Linker version detected at compile time.]) 20 ]) 21 22 # 23 # Determine if the system can handle the -R option being passed to the linker. 24 # 25 # This macro is specific to LLVM. 26 # 27 AC_DEFUN([AC_LINK_USE_R], 28 [AC_CACHE_CHECK([for compiler -Wl,-R<path> option],[llvm_cv_link_use_r], 29 [ AC_LANG_PUSH([C]) 30 oldcflags="$CFLAGS" 31 CFLAGS="$CFLAGS -Wl,-R." 32 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], 33 [llvm_cv_link_use_r=yes],[llvm_cv_link_use_r=no]) 34 CFLAGS="$oldcflags" 35 AC_LANG_POP([C]) 36 ]) 37 if test "$llvm_cv_link_use_r" = yes ; then 38 AC_DEFINE([HAVE_LINK_R],[1],[Define if you can use -Wl,-R. to pass -R. to the linker, in order to add the current directory to the dynamic linker search path.]) 39 fi 40 ]) 41 42 # 43 # Determine if the system can handle the -R option being passed to the linker. 44 # 45 # This macro is specific to LLVM. 46 # 47 AC_DEFUN([AC_LINK_EXPORT_DYNAMIC], 48 [AC_CACHE_CHECK([for compiler -Wl,-export-dynamic option], 49 [llvm_cv_link_use_export_dynamic], 50 [ AC_LANG_PUSH([C]) 51 oldcflags="$CFLAGS" 52 CFLAGS="$CFLAGS -Wl,-export-dynamic" 53 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], 54 [llvm_cv_link_use_export_dynamic=yes],[llvm_cv_link_use_export_dynamic=no]) 55 CFLAGS="$oldcflags" 56 AC_LANG_POP([C]) 57 ]) 58 if test "$llvm_cv_link_use_export_dynamic" = yes ; then 59 AC_DEFINE([HAVE_LINK_EXPORT_DYNAMIC],[1],[Define if you can use -Wl,-export-dynamic.]) 60 fi 61 ]) 62 63 # 64 # Determine if the system can handle the --version-script option being 65 # passed to the linker. 66 # 67 # This macro is specific to LLVM. 68 # 69 AC_DEFUN([AC_LINK_VERSION_SCRIPT], 70 [AC_CACHE_CHECK([for compiler -Wl,--version-script option], 71 [llvm_cv_link_use_version_script], 72 [ AC_LANG_PUSH([C]) 73 oldcflags="$CFLAGS" 74 75 # The following code is from the autoconf manual, 76 # "11.13: Limitations of Usual Tools". 77 # Create a temporary directory $tmp in $TMPDIR (default /tmp). 78 # Use mktemp if possible; otherwise fall back on mkdir, 79 # with $RANDOM to make collisions less likely. 80 : ${TMPDIR=/tmp} 81 { 82 tmp=` 83 (umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null 84 ` && 85 test -n "$tmp" && test -d "$tmp" 86 } || { 87 tmp=$TMPDIR/foo$$-$RANDOM 88 (umask 077 && mkdir "$tmp") 89 } || exit $? 90 91 echo "{" > "$tmp/export.map" 92 echo " global: main;" >> "$tmp/export.map" 93 echo " local: *;" >> "$tmp/export.map" 94 echo "};" >> "$tmp/export.map" 95 96 CFLAGS="$CFLAGS -Wl,--version-script=$tmp/export.map" 97 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], 98 [llvm_cv_link_use_version_script=yes],[llvm_cv_link_use_version_script=no]) 99 rm "$tmp/export.map" 100 rmdir "$tmp" 101 CFLAGS="$oldcflags" 102 AC_LANG_POP([C]) 103 ]) 104 if test "$llvm_cv_link_use_version_script" = yes ; then 105 AC_SUBST(HAVE_LINK_VERSION_SCRIPT,1) 106 fi 107 ]) 108 109
