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rt: Turn forwards from librt to libc into compat symbols [BZ #24194]
As the result of commit 6e6249d0b4
("BZ#14743: Move clock_* symbols from librt to libc."), in glibc 2.17,
clock_gettime, clock_getres, clock_settime, clock_getcpuclockid,
clock_nanosleep were added to libc, and the file rt/clock-compat.c
was added with forwarders to the actual implementations in libc.
These forwarders were wrapped in
#if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_17)
so that they are not present for newer architectures (such as
powerpc64le) with a 2.17 or later ABI baseline. But the forwarders
were not marked as compatibility symbols. As a result, on older
architectures, historic configure checks such as
AC_CHECK_LIB(rt, clock_gettime)
still cause linking against librt, even though this is completely
unnecessary. It also creates a needless porting hazard because
architectures behave differently when it comes to symbol availability.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
parent
823624bdc4
commit
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@ -1,3 +1,8 @@
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2019-02-07 Florian Weimer <fweimer@redhat.com>
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* rt/clock-compat.c (COMPAT_REDIRECT): Turn librt forwarders into
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compatibility symbols.
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2019-02-07 Stefan Liebler <stli@linux.ibm.com>
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[BZ #24180]
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6
NEWS
6
NEWS
@ -14,7 +14,11 @@ Major new features:
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Deprecated and removed features, and other changes affecting compatibility:
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[Add deprecations, removals and changes affecting compatibility here]
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* The functions clock_gettime, clock_getres, clock_settime,
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clock_getcpuclockid, clock_nanosleep were removed from the librt library
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for new applications (on architectures which had them). Instead, the
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definitions in libc will be used automatically, which have been available
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since glibc 2.17.
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Changes to build and runtime requirements:
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@ -30,14 +30,16 @@
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#if HAVE_IFUNC
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# undef INIT_ARCH
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# define INIT_ARCH()
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# define COMPAT_REDIRECT(name, proto, arglist) libc_ifunc (name, &__##name)
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# define COMPAT_REDIRECT(name, proto, arglist) libc_ifunc (name, &__##name) \
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compat_symbol (librt, name, name, GLIBC_2_2);
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#else
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# define COMPAT_REDIRECT(name, proto, arglist) \
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int \
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name proto \
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{ \
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return __##name arglist; \
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}
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} \
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compat_symbol (librt, name, name, GLIBC_2_2);
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#endif
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COMPAT_REDIRECT (clock_getres,
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