diff options
Diffstat (limited to 'autoconf/m4/link_options.m4')
-rw-r--r-- | autoconf/m4/link_options.m4 | 47 |
1 files changed, 45 insertions, 2 deletions
diff --git a/autoconf/m4/link_options.m4 b/autoconf/m4/link_options.m4 index 66036de433d3c..697abab07d4d4 100644 --- a/autoconf/m4/link_options.m4 +++ b/autoconf/m4/link_options.m4 @@ -8,7 +8,7 @@ AC_DEFUN([AC_LINK_USE_R], [ AC_LANG_PUSH([C]) oldcflags="$CFLAGS" CFLAGS="$CFLAGS -Wl,-R." - AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])], + AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], [llvm_cv_link_use_r=yes],[llvm_cv_link_use_r=no]) CFLAGS="$oldcflags" AC_LANG_POP([C]) @@ -29,7 +29,7 @@ AC_DEFUN([AC_LINK_EXPORT_DYNAMIC], [ AC_LANG_PUSH([C]) oldcflags="$CFLAGS" CFLAGS="$CFLAGS -Wl,-export-dynamic" - AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[int main() { return 0; }]])], + AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], [llvm_cv_link_use_export_dynamic=yes],[llvm_cv_link_use_export_dynamic=no]) CFLAGS="$oldcflags" AC_LANG_POP([C]) @@ -39,3 +39,46 @@ if test "$llvm_cv_link_use_export_dynamic" = yes ; then fi ]) +# +# Determine if the system can handle the -retain-symbols-file option being +# passed to the linker. +# +# This macro is specific to LLVM. +# +AC_DEFUN([AC_LINK_RETAIN_SYMBOLS_FILE], +[AC_CACHE_CHECK([for compiler -Wl,-retain-symbols-file option], + [llvm_cv_link_use_retain_symbols_file], +[ AC_LANG_PUSH([C]) + oldcflags="$CFLAGS" + + # The following code is from the autoconf manual, + # "11.13: Limitations of Usual Tools". + # Create a temporary directory $tmp in $TMPDIR (default /tmp). + # Use mktemp if possible; otherwise fall back on mkdir, + # with $RANDOM to make collisions less likely. + : ${TMPDIR=/tmp} + { + tmp=` + (umask 077 && mktemp -d "$TMPDIR/fooXXXXXX") 2>/dev/null + ` && + test -n "$tmp" && test -d "$tmp" + } || { + tmp=$TMPDIR/foo$$-$RANDOM + (umask 077 && mkdir "$tmp") + } || exit $? + + echo "main" > "$tmp/exports" + + CFLAGS="$CFLAGS -Wl,-retain-symbols-file=$tmp/exports" + AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], + [llvm_cv_link_use_retain_symbols_file=yes],[llvm_cv_link_use_retain_symbols_file=no]) + rm "$tmp/exports" + rmdir "$tmp" + CFLAGS="$oldcflags" + AC_LANG_POP([C]) +]) +if test "$llvm_cv_link_use_retain_symbols_file" = yes ; then + AC_SUBST(HAVE_LINK_RETAIN_SYMBOLS_FILE,1) + fi +]) + |