Re: [PATCH] Add --enable-static-c++-link-check option [BZ #31412]

[Florian Weimer <fweimer@redhat.com>]

* H. J. Lu:

> On Sat, May 25, 2024 at 2:54 AM Florian Weimer <fweimer@redhat.com> wrote:
>>
>> * H. J. Lu:
>>
>> > The current minimum GCC version of glibc build is GCC 6.2 or newer.  When
>> > building i686 glibc on Fedora 40, GCC 6.4 failed the static C++ link test
>> > since the 32-bit libc.a was built with GCC 14 and has references to
>> > __divmoddi4 which was added to GCC 7.  Add --enable-static-c++-link-check
>> > configure option which is on by default.  --disable-static-c++-link-check
>> > can be used to disable the static C++ link test.  The newly built i686
>> > libc.a can be used by GCC 6.4 to create static C++ tests.  This fixes
>> > BZ #31412.
>>
>> But won't there still be tons of test suite failures?
>
> I only saw
>
> FAIL: misc/tst-pidfd
> FAIL: misc/tst-pidfd_getpid
>
> with GCC 6.4.  I will check if it is a testcase issue.
>
>> Even CXX=no will not work because in some configurations, it's actually
>> libgcc_s.so.1 that can't be loaded, and that breaks pthread_cancel.
>>
>
> c++ still works.  Only "c++ -static" doesn't work with the system libc.a.

I think you'll see the issue if you go back further, to the 2.34 branch.

Thanks,
Florian