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authorFlorian Weimer <fweimer@redhat.com>2019-02-08 10:21:56 +0100
committerFlorian Weimer <fweimer@redhat.com>2019-02-08 10:43:17 +0100
commitf289e656ec8221756519a601042bc9fbe1b310fb (patch)
treed0a6ca2140f0e4a0fa34fd10ee0b0c03266fb196 /sysdeps/gnu/getutmpx.c
parent823624bdc47f1f80109c9c52dee7939b9386d708 (diff)
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rt: Turn forwards from librt to libc into compat symbols [BZ #24194]
As the  result of commit 6e6249d0b461b952d0f544792372663feb6d792a
("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>
Diffstat (limited to 'sysdeps/gnu/getutmpx.c')
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