fanquake 88fd3f81ec guix: use -fcommon when building glibc 2.24 ...

GCC 10 started using -fno-common by default, which causes issues with
the powerpc builds using gibc 2.24. A patch was commited to glibc to fix
the issue, 18363b4f010da9ba459b13310b113ac0647c2fcc but is non-trvial
to backport, and was broken in at least one way, see the followup in
commit 7650321ce037302bfc2f026aa19e0213b8d02fe6.

For now, retain the legacy GCC behaviour by passing -fcommon when
building glibc 2.24.

https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html.
https://sourceware.org/git/?p=glibc.git;a=commit;h=18363b4f010da9ba459b13310b113ac0647c2fcc
https://sourceware.org/git/?p=glibc.git;a=commit;h=7650321ce037302bfc2f026aa19e0213b8d02fe6

2022-05-12 08:21:16 +01:00

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