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Build: Check for clock_gettime() even if not using POSIX threads.
See the new comment in the code. This also makes the check for clock_gettime() run with MinGW-w64 with which we don't want to use clock_gettime(). The previous commit already took care of this situation.
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1 changed files with 18 additions and 13 deletions
31
configure.ac
31
configure.ac
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@ -622,21 +622,10 @@ AS_CASE([$enable_threads],
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AC_DEFINE([MYTHREAD_POSIX], [1],
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[Define to 1 when using POSIX threads (pthreads).])
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# These are nice to have but not mandatory.
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#
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# FIXME: xz uses clock_gettime if it is available and can do
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# it even when threading is disabled. Moving this outside
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# of pthread detection may be undesirable because then
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# liblzma may get linked against librt even when librt isn't
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# needed by liblzma.
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# This is nice to have but not mandatory.
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OLD_CFLAGS=$CFLAGS
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CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
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AC_SEARCH_LIBS([clock_gettime], [rt])
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AC_CHECK_FUNCS([clock_gettime pthread_condattr_setclock])
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AC_CHECK_DECL([CLOCK_MONOTONIC], [AC_DEFINE(
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[HAVE_CLOCK_MONOTONIC], [1], [Define to 1 if
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`CLOCK_MONOTONIC' is declared in <time.h>.])], [],
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[[#include <time.h>]])
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AC_CHECK_FUNCS([pthread_condattr_setclock])
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CFLAGS=$OLD_CFLAGS
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],
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[win95], [
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@ -916,6 +905,22 @@ fi
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# Gnulib replacements as needed
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gl_GETOPT
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# If clock_gettime() is available, liblzma with pthreads may use it, and
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# xz may use it even when threading support is disabled. In XZ Utils 5.4.x
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# and older, configure checked for clock_gettime() only when using pthreads.
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# This way non-threaded builds of liblzma didn't get a useless dependency on
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# librt which further had a dependency on libpthread. Avoiding these was
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# useful when a small build was needed, for example, for initramfs use.
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#
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# The above reasoning is thoroughly obsolete: On GNU/Linux, librt hasn't
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# been needed for clock_gettime() since glibc 2.17 (2012-12-25).
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# Solaris 10 needs librt but Solaris 11 doesn't anymore.
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AC_SEARCH_LIBS([clock_gettime], [rt])
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AC_CHECK_FUNCS([clock_gettime])
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AC_CHECK_DECL([CLOCK_MONOTONIC], [AC_DEFINE([HAVE_CLOCK_MONOTONIC], [1],
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[Define to 1 if 'CLOCK_MONOTONIC' is declared in <time.h>.])], [],
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[[#include <time.h>]])
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# Find the best function to set timestamps.
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AC_CHECK_FUNCS([futimens futimes futimesat utimes _futime utime], [break])
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