[OE-core] [PATCH 1/2] libunwind: fix build by linking with bfd instead of gold

[Martin Jansa]

On Wed, Sep 21, 2016 at 07:30:43AM +0200, Andreas Müller wrote:
> works around:
> <native-sysroot>/ld: error: Gperf-simple.o: cannot make copy relocation for protected symbol '_Uarm_local_addr_space', defined in ../src/.libs/libunwind-arm.so
> collect2: error: ld returned 1 exit status
> Makefile:1038: recipe for target 'Gperf-simple' failed
> make[1]: *** [Gperf-simple] Error 1
> make[1]: *** Waiting for unfinished jobs....
> <...>
> <native-sysroot>/ld: error: Lperf-simple.o: cannot make copy relocation for protected symbol '_ULarm_local_addr_space', defined in ../src/.libs/libunwind.so
> collect2: error: ld returned 1 exit status
> Makefile:1094: recipe for target 'Lperf-simple' failed
> make[1]: *** [Lperf-simple] Error 1
> <...>
> ERROR: oe_runmake failed
> <native-sysroot>/ld: error: Gperf-trace.o: cannot make copy relocation for protected symbol '_Uarm_local_addr_space', defined in ../src/.libs/libunwind-arm.so
> collect2: error: ld returned 1 exit status
> Makefile:1042: recipe for target 'Gperf-trace' failed
> make[1]: *** [Gperf-trace] Error 1
> <native-sysroot>/ld: error: Lperf-trace.o: cannot make copy relocation for protected symbol '_ULarm_local_addr_space', defined in ../src/.libs/libunwind.so
> collect2: error: ld returned 1 exit status
> Makefile:1098: recipe for target 'Lperf-trace' failed
> make[1]: *** [Lperf-trace] Error 1
> <...>
> <native-sysroot>/ld: error: test-coredump-unwind.o: cannot make copy relocation for protected symbol '_UCD_accessors', defined in ../src/.libs/libunwind-coredump.so
> collect2: error: ld returned 1 exit status
> Makefile:1186: recipe for target 'test-coredump-unwind' failed

Acked-by: Martin Jansa <Martin.Jansa at gmail.com>

I've verified that this fixes the issue I was reporting in "bitbake
wordl status" e-mails since last binutils upgrade to 2.27

It's basically complement to this oe-core change which went in together
with binutils:

commit 0092a076adb11cac411c86389af84bb96169730f
Author: Khem Raj <raj.khem at gmail.com>
Date:   Mon Aug 8 15:51:01 2016 -0700

    libunwind: Do not use gold for linking

Which only stopped gold being used when bfd is the default linker, but
which left libunwind broken for people with ld-is-gold in
DISTRO_FEATURES to use gold by default.

Thanks!

> Signed-off-by: Andreas Müller <schnitzeltony at googlemail.com>
> ---
>  meta/recipes-support/libunwind/libunwind_git.bb | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/meta/recipes-support/libunwind/libunwind_git.bb b/meta/recipes-support/libunwind/libunwind_git.bb
> index cd4cb89..4249430 100644
> --- a/meta/recipes-support/libunwind/libunwind_git.bb
> +++ b/meta/recipes-support/libunwind/libunwind_git.bb
> @@ -26,3 +26,4 @@ SECURITY_CFLAGS_append_aarch64 = " -fPIE"
>  
>  S = "${WORKDIR}/git"
>  
> +LDFLAGS += "-Wl,-z,relro,-z,now ${@bb.utils.contains('DISTRO_FEATURES', 'ld-is-gold', ' -fuse-ld=bfd ', '', d)}"
> -- 
> 2.5.5
> 
> -- 
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-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa at gmail.com
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