From 244acf3a4b172657924d21bbb3a65f6388cb68bd Mon Sep 17 00:00:00 2001 From: Bob Wilson Date: Fri, 2 Aug 2013 22:51:06 +0000 Subject: 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187686 91177308-0d34-0410-b5e6-96231b3b80d8 --- projects/sample/autoconf/configure.ac | 4 ++-- projects/sample/autoconf/m4/link_options.m4 | 9 +++++---- 2 files changed, 7 insertions(+), 6 deletions(-) (limited to 'projects') diff --git a/projects/sample/autoconf/configure.ac b/projects/sample/autoconf/configure.ac index 5c8dbb3139..dc0acf3bb4 100644 --- a/projects/sample/autoconf/configure.ac +++ b/projects/sample/autoconf/configure.ac @@ -985,7 +985,7 @@ AC_LINK_GET_VERSION dnl Determine whether the linker supports the -R option. AC_LINK_USE_R -dnl Determine whether the linker supports the -export-dynamic option. +dnl Determine whether the compiler supports the -rdynamic option. AC_LINK_EXPORT_DYNAMIC dnl Determine whether the linker supports the --version-script option. @@ -1464,7 +1464,7 @@ AC_SUBST(RPATH) dnl Determine linker rdynamic flag if test "$llvm_cv_link_use_export_dynamic" = "yes" ; then - RDYNAMIC="-Wl,-export-dynamic" + RDYNAMIC="-rdynamic" else RDYNAMIC="" fi diff --git a/projects/sample/autoconf/m4/link_options.m4 b/projects/sample/autoconf/m4/link_options.m4 index 57da4a0d92..b58d61745f 100644 --- a/projects/sample/autoconf/m4/link_options.m4 +++ b/projects/sample/autoconf/m4/link_options.m4 @@ -40,23 +40,24 @@ if test "$llvm_cv_link_use_r" = yes ; then ]) # -# Determine if the system can handle the -R option being passed to the linker. +# Determine if the system can handle the -rdynamic option being passed +# to the compiler. # # This macro is specific to LLVM. # AC_DEFUN([AC_LINK_EXPORT_DYNAMIC], -[AC_CACHE_CHECK([for compiler -Wl,-export-dynamic option], +[AC_CACHE_CHECK([for compiler -rdynamic option], [llvm_cv_link_use_export_dynamic], [ AC_LANG_PUSH([C]) oldcflags="$CFLAGS" - CFLAGS="$CFLAGS -Wl,-export-dynamic" + CFLAGS="$CFLAGS -rdynamic" AC_LINK_IFELSE([AC_LANG_PROGRAM([[]],[[]])], [llvm_cv_link_use_export_dynamic=yes],[llvm_cv_link_use_export_dynamic=no]) CFLAGS="$oldcflags" AC_LANG_POP([C]) ]) if test "$llvm_cv_link_use_export_dynamic" = yes ; then - AC_DEFINE([HAVE_LINK_EXPORT_DYNAMIC],[1],[Define if you can use -Wl,-export-dynamic.]) + AC_DEFINE([HAVE_LINK_EXPORT_DYNAMIC],[1],[Define if you can use -rdynamic.]) fi ]) -- cgit v1.2.3