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commit f289e656ec8221756519a601042bc9fbe1b310fb
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Feb 8 10:21:56 2019 +0100
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rt: Turn forwards from librt to libc into compat symbols [BZ #24194]
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As the result of commit 6e6249d0b461b952d0f544792372663feb6d792a
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("BZ#14743: Move clock_* symbols from librt to libc."), in glibc 2.17,
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clock_gettime, clock_getres, clock_settime, clock_getcpuclockid,
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clock_nanosleep were added to libc, and the file rt/clock-compat.c
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was added with forwarders to the actual implementations in libc.
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These forwarders were wrapped in
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#if SHLIB_COMPAT (librt, GLIBC_2_2, GLIBC_2_17)
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so that they are not present for newer architectures (such as
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powerpc64le) with a 2.17 or later ABI baseline. But the forwarders
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were not marked as compatibility symbols. As a result, on older
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architectures, historic configure checks such as
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AC_CHECK_LIB(rt, clock_gettime)
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still cause linking against librt, even though this is completely
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unnecessary. It also creates a needless porting hazard because
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architectures behave differently when it comes to symbol availability.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/rt/clock-compat.c b/rt/clock-compat.c
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index f816973c05c29d5d..11e71aa89019b173 100644
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--- a/rt/clock-compat.c
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+++ b/rt/clock-compat.c
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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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