[PATCH] PR other/91396 Fix static link error with -fvtable-verify

[Caroline Tice via gcc-patches]

The bootstrap succeeded.

On Mon, Aug 12, 2019 at 11:51 AM Caroline Tice <cmtice@google.com> wrote:
>
> Hi,
>
> This patch is to fix a bug where linking with -fvtable-verify  and
> -static causes the linker to complain about multiple definitions of
> things in the vtv_end*.o files (once from the .o file and once from
> libvtv.a).   (See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91396).
> The fix is for the GNU_USER_TARGET_ENDFILE_SPEC to only include the
> vtv_end*.o files if we're not doing static linking (and we are using
> -fvtable-verify flags).
>
> Tested this fix by verifying that the test case in the bug compiles
> both with and without -static, and that there were no new regressions
> in the libvtv testsuite.  I'm in the process of doing a full bootstrap
> build with this change.   Assuming the bootstrap passes, is this ok to
> commit?
>
> Index: gcc/config/gnu-user.h
> ===================================================================
> --- gcc/config/gnu-user.h (revision 274317)
> +++ gcc/config/gnu-user.h (working copy)
> @@ -73,9 +73,9 @@
>     GNU userspace "finalizer" file, `crtn.o'.  */
>
>  #define GNU_USER_TARGET_ENDFILE_SPEC \
> -  "%{fvtable-verify=none:%s; \
> +  "%{!static:%{fvtable-verify=none:%s; \
>       fvtable-verify=preinit:vtv_end_preinit.o%s; \
> -     fvtable-verify=std:vtv_end.o%s} \
> +     fvtable-verify=std:vtv_end.o%s}} \
>     %{static:crtend.o%s; \
>       shared|static-pie|" PIE_SPEC ":crtendS.o%s; \
>       :crtend.o%s} " \
>
> ChangeLog entry:
>
> 2019-08-12  Caroline Tice  <cmtice@google.com>
>
>         PR other/91396
>         * config/gnu-user.h (GNU_USER_TARGET_ENDFILE_SPEC): Only add the
>         vtv_end.o or vtv_end_preinit.o files if !static.