mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-11 09:20:51 +00:00
45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
# timer_time.m4 serial 3
|
|
dnl Copyright (C) 2011-2019 Free Software Foundation, Inc.
|
|
dnl This file is free software; the Free Software Foundation
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
|
dnl with or without modifications, as long as this notice is preserved.
|
|
|
|
# Check for timer_settime, and set LIB_TIMER_TIME.
|
|
|
|
AC_DEFUN([gl_TIMER_TIME],
|
|
[
|
|
dnl Based on clock_time.m4. See details there.
|
|
|
|
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
|
|
|
|
dnl Test whether the gnulib module 'threadlib' is in use.
|
|
dnl Some packages like Emacs use --avoid=threadlib.
|
|
dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
|
|
dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
|
|
m4_ifdef([gl_][THREADLIB], [AC_REQUIRE([gl_][THREADLIB])])
|
|
|
|
LIB_TIMER_TIME=
|
|
AC_SUBST([LIB_TIMER_TIME])
|
|
gl_saved_libs=$LIBS
|
|
AC_SEARCH_LIBS([timer_settime], [rt posix4],
|
|
[test "$ac_cv_search_timer_settime" = "none required" ||
|
|
LIB_TIMER_TIME=$ac_cv_search_timer_settime])
|
|
m4_ifdef([gl_][THREADLIB],
|
|
[dnl GLIBC uses threads to emulate posix timers when kernel support
|
|
dnl is not available (like Linux < 2.6 or when used with kFreeBSD)
|
|
dnl Now the pthread lib is linked automatically in the normal case,
|
|
dnl but when linking statically, it needs to be explicitly specified.
|
|
AC_EGREP_CPP([Thread],
|
|
[#include <features.h>
|
|
#ifdef __GNU_LIBRARY__
|
|
#if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) || (__GLIBC__ > 2)) \
|
|
&& !(__UCLIBC__ && __HAS_NO_THREADS__)
|
|
Thread emulation available
|
|
#endif
|
|
#endif
|
|
],
|
|
[LIB_TIMER_TIME="$LIB_TIMER_TIME $LIBMULTITHREAD"])])
|
|
AC_CHECK_FUNCS([timer_settime])
|
|
LIBS=$gl_saved_libs
|
|
])
|