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

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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
This commit is contained in:
Bob Wilson
2013-08-02 22:51:06 +00:00
parent 40bacacad3
commit 244acf3a4b
6 changed files with 16 additions and 14 deletions
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4
autoconf/configure.ac
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@@ -1239,7 +1239,7 @@ 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.
@@ -1863,7 +1863,7 @@ 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