Re: Avoid use of libgcc_s and libgcc_eh when building glibc

[Khem Raj <raj dot khem at gmail dot com>]

On Tue, Aug 14, 2012 at 11:14 PM, Khem Raj <raj.khem@gmail.com> wrote:
> On Tue, Aug 14, 2012 at 10:29 PM, Khem Raj <raj.khem@gmail.com> wrote:
>> On Sat, Aug 11, 2012 at 10:43 PM, Mike Frysinger <vapier@gentoo.org> wrote:
>>> On Monday 28 May 2012 17:43:04 Joseph S. Myers wrote:
>>>> I've tested this patch for x86_64 and also done a test build for ARM.
>>>> To go in it will certainly need more architecture testing (libc
>>>> architectures and IA64) - but since it seems likely that review will
>>>> point out changes that should be made, perhaps we could sort out any
>>>> such changes first so the architecture maintainers are testing a patch
>>>> that could, subject to such testing, go in?
>>>
>>> i tested glibc-2.16 with the patch merged into latest git (and tweaking it a
>>> little to apply).  after disabling the long standing -lgcc_eh hack in our
>>> build system, i was able to bootstrap an ia64 cross-compiler fine: binutils,
>>> kernel/glibc headers, gcc stage1 (static C-only), full glibc, gcc stage2 (full
>>> C/C++/etc...).
>>> -mike
>>
>> I am getting this error below. I see that libunwind.o is included in
>> libgcc.a when building gcc-static
>>
>
> reason I think is csu/libc-start.o is compiled with -fexceptions which
> generated undefined ref to __aeabi_unwind_cpp_pr0
> which is then resolved from unwind-arm.o in libgcc.a and unwind-arm.o
> needs libunwind.o to resolve bunch of its symbols
> and that pulls libunwind.o from libgcc and causes the duplicate provider

if I change the order of stub library and libgcc then it works fine
may be it needs to be $(static-gnulib-arch) -lgcc
$(static-gnulib-arch) but below patch worked for me.

Index: libc/Makeconfig
===================================================================
--- libc.orig/Makeconfig        2012-08-14 22:11:46.401357406 -0700
+++ libc/Makeconfig     2012-08-14 23:25:04.681524667 -0700
@@ -572,7 +572,7 @@
 gnulib = -lgcc $(gnulib-arch)
 gnulib-tests := -lgcc $(libgcc_eh)
 static-gnulib-arch =
-static-gnulib = -lgcc $(static-gnulib-arch)
+static-gnulib = $(static-gnulib-arch) -lgcc
 static-gnulib-tests := -lgcc -lgcc_eh $(libunwind)
 libc.so-gnulib := -lgcc
 endif