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| author | Florian Weimer <fweimer@redhat.com> | 2019-02-08 10:21:56 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2019-02-08 10:43:17 +0100 |
| commit | f289e656ec8221756519a601042bc9fbe1b310fb (patch) | |
| tree | d0a6ca2140f0e4a0fa34fd10ee0b0c03266fb196 | |
| parent | 823624bdc47f1f80109c9c52dee7939b9386d708 (diff) | |
| download | glibc-f289e656ec8221756519a601042bc9fbe1b310fb.zip glibc-f289e656ec8221756519a601042bc9fbe1b310fb.tar.gz glibc-f289e656ec8221756519a601042bc9fbe1b310fb.tar.bz2 | |
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>
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | NEWS | 6 | ||||
| -rw-r--r-- | rt/clock-compat.c | 6 |
3 files changed, 14 insertions, 3 deletions
@@ -1,3 +1,8 @@ +2019-02-07 Florian Weimer <fweimer@redhat.com> + + * rt/clock-compat.c (COMPAT_REDIRECT): Turn librt forwarders into + compatibility symbols. + 2019-02-07 Stefan Liebler <stli@linux.ibm.com> [BZ #24180] @@ -14,7 +14,11 @@ Major new features: Deprecated and removed features, and other changes affecting compatibility: - [Add deprecations, removals and changes affecting compatibility here] +* The functions clock_gettime, clock_getres, clock_settime, + clock_getcpuclockid, clock_nanosleep were removed from the librt library + for new applications (on architectures which had them). Instead, the + definitions in libc will be used automatically, which have been available + since glibc 2.17. Changes to build and runtime requirements: diff --git a/rt/clock-compat.c b/rt/clock-compat.c index c603f40..d8ced3cd 100644 --- a/rt/clock-compat.c +++ b/rt/clock-compat.c @@ -30,14 +30,16 @@ #if HAVE_IFUNC # undef INIT_ARCH # define INIT_ARCH() -# define COMPAT_REDIRECT(name, proto, arglist) libc_ifunc (name, &__##name) +# define COMPAT_REDIRECT(name, proto, arglist) libc_ifunc (name, &__##name) \ + compat_symbol (librt, name, name, GLIBC_2_2); #else # define COMPAT_REDIRECT(name, proto, arglist) \ int \ name proto \ { \ return __##name arglist; \ - } + } \ + compat_symbol (librt, name, name, GLIBC_2_2); #endif COMPAT_REDIRECT (clock_getres, |