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Diffstat (limited to 'autoconf/m4/link_options.m4')
-rw-r--r--autoconf/m4/link_options.m447
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
+])
+