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:-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-\([^ ]*\)\( (.*)\)\{0,1\}#\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 "$llvm_cv_link_use_r" = yes ; then 38 AC_DEFINE([HAVE_LINK_R],[1],[Define if you can use -Wl,-R. to pass -R. to the linker, in order to add the current directory to the dynamic linker search path.]) 39 fi 40 ]) 41 42 # 43 # Determine if the system can handle the -rdynamic option being passed 44 # to the compiler. 45 # 46 # This macro is specific to LLVM. 47 # 48 AC_DEFUN([AC_LINK_EXPORT_DYNAMIC], 49 [AC_CACHE_CHECK([for compiler -rdynamic option], 50 [llvm_cv_link_use_export_dynamic], 51 [ AC_LANG_PUSH([C]) 52 oldcflags="$CFLAGS" 53 CFLAGS="$CFLAGS -rdynamic" 54 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], 55 [llvm_cv_link_use_export_dynamic=yes],[llvm_cv_link_use_export_dynamic=no]) 56 CFLAGS="$oldcflags" 57 AC_LANG_POP([C]) 58 ]) 59 if test "$llvm_cv_link_use_export_dynamic" = yes ; then 60 AC_DEFINE([HAVE_LINK_EXPORT_DYNAMIC],[1],[Define if you can use -rdynamic.]) 61 fi 62 ]) 63 64 # 65 # Determine if the system can handle the --version-script option being 66 # passed to the linker. 67 # 68 # This macro is specific to LLVM. 69 # 70 AC_DEFUN([AC_LINK_VERSION_SCRIPT], 71 [AC_CACHE_CHECK([for compiler -Wl,--version-script option], 72 [llvm_cv_link_use_version_script], 73 [ AC_LANG_PUSH([C]) 74 oldcflags="$CFLAGS" 75 76 # The following code is from the autoconf manual, 77 # "11.13: Limitations of Usual Tools". 78 # Create a temporary directory $tmp in $TMPDIR (default /tmp). 79 # Use mktemp if possible; otherwise fall back on mkdir, 80 # with $RANDOM to make collisions less likely. 81 : ${TMPDIR=/tmp} 82 { 83 tmp=` 84 (umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null 85 ` && 86 test -n "$tmp" && test -d "$tmp" 87 } || { 88 tmp=$TMPDIR/foo$$-$RANDOM 89 (umask 077 && mkdir "$tmp") 90 } || exit $? 91 92 echo "{" > "$tmp/export.map" 93 echo " global: main;" >> "$tmp/export.map" 94 echo " local: *;" >> "$tmp/export.map" 95 echo "};" >> "$tmp/export.map" 96 97 CFLAGS="$CFLAGS -Wl,--version-script=$tmp/export.map" 98 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], 99 [llvm_cv_link_use_version_script=yes],[llvm_cv_link_use_version_script=no]) 100 rm "$tmp/export.map" 101 rmdir "$tmp" 102 CFLAGS="$oldcflags" 103 AC_LANG_POP([C]) 104 ]) 105 if test "$llvm_cv_link_use_version_script" = yes ; then 106 AC_SUBST(HAVE_LINK_VERSION_SCRIPT,1) 107 fi 108 ]) 109 110
