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With commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c ("ld.so:
Support moving versioned symbols between sonames [BZ #24741]"), the
dynamic linker will find the definition of vfork in libc and binds
a vfork reference to that symbol, even if the soname in the version
reference says that the symbol should be located in libpthread.
As a result, the forwarder (whether it's IFUNC-based or a duplicate
of the libc implementation) is no longer necessary.
On older architectures, a placeholder symbol is required, to make sure
that the GLIBC_2.1.2 symbol version does not go away, or is turned in
to a weak symbol definition by the link editor. (The symbol version
needs to preserved so that the symbol coverage check in
elf/dl-version.c does not fail for old binaries.)
mips32 is an outlier: It defined __vfork@@GLIBC_2.2, but the
baseline is GLIBC_2.0. Since there are other @@GLIBC_2.2 symbols,
the placeholder symbol is not needed there.
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* All files with FSF copyright notices: Update copyright dates
using scripts/update-copyrights.
* locale/programs/charmap-kw.h: Regenerated.
* locale/programs/locfile-kw.h: Likewise.
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* All files with FSF copyright notices: Update copyright dates
using scripts/update-copyrights.
* locale/programs/charmap-kw.h: Regenerated.
* locale/programs/locfile-kw.h: Likewise.
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This patch uses the libc_ifunc macro to create already existing ifunc functions
vfork_ifunc and __vfork_ifunc if HAVE_IFUNC is defined.
ChangeLog:
* nptl/pt-vfork.c (DEFINE_VFORK): Use libc_ifunc macro.
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* nptl/pt-vfork.c (vfork_resolve): Rename from vfork_ifunc.
(vfork, __vfork): Define via compat_symbol.
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* nptl/pt-vfork.c: Error if !HAVE_IFUNC.
[!HAVE_IFUNC] (vfork_compat): Remove.
[!HAVE_IFUNC] (DEFINE_VFORK): Remove.
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