Link with -rdynamic instead of -Wl,-export-dynamic.

Recent versions of the OS X linker support this but follow the existing
OS X linker convention of using an underscore in the option name, i.e.,
-export_dynamic. Rather than changing our configure scripts to check for
that alternate spelling, it is simpler to just use the compiler's -rdynamic
option and let it deal with translating that to the appropriate linker
option. One potential disadvantage of this approach is that the compiler
will typically ignore -rdynamic on platforms where it is not supported, so
the HAVE_LINK_EXPORT_DYNAMIC in config.h will not necessarily show whether
that option has any effect or not. I don't see any in-tree uses of that
macro, so I'm assuming it is OK.

llvm-svn: 187686

2 files changed, 2 insertions, 2 deletions

diff --git a/llvm/include/llvm/Config/config.h.cmake b/llvm/include/llvm/Config/config.h.cmake
index 98f7417efb1..97035937fce 100644
--- a/llvm/include/llvm/Config/config.h.cmake
+++ b/llvm/include/llvm/Config/config.h.cmake
@@ -209,7 +209,7 @@
 /* Define to 1 if you have the <limits.h> header file. */
 #cmakedefine HAVE_LIMITS_H ${HAVE_LIMITS_H}
 
-/* Define if you can use -Wl,-export-dynamic. */
+/* Define if you can use -rdynamic. */
 #define HAVE_LINK_EXPORT_DYNAMIC 1
 
 /* Define if you can use -Wl,-R. to pass -R. to the linker, in order to add
diff --git a/llvm/include/llvm/Config/config.h.in b/llvm/include/llvm/Config/config.h.in
index 2c4d09c6734..74b7829d3b5 100644
--- a/llvm/include/llvm/Config/config.h.in
+++ b/llvm/include/llvm/Config/config.h.in
@@ -220,7 +220,7 @@
 /* Define to 1 if you have the `z' library (-lz). */
 #undef HAVE_LIBZ
 
-/* Define if you can use -Wl,-export-dynamic. */
+/* Define if you can use -rdynamic. */
 #undef HAVE_LINK_EXPORT_DYNAMIC
 
 /* Define to 1 if you have the <link.h> header file. */