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45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
# timer_time.m4 serial 3
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dnl Copyright (C) 2011-2017 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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# Check for timer_settime, and set LIB_TIMER_TIME.
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AC_DEFUN([gl_TIMER_TIME],
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[
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dnl Based on clock_time.m4. See details there.
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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dnl Test whether the gnulib module 'threadlib' is in use.
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dnl Some packages like Emacs use --avoid=threadlib.
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dnl Write the symbol in such a way that it does not cause 'aclocal' to pick
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dnl the threadlib.m4 file that is installed in $PREFIX/share/aclocal/.
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m4_ifdef([gl_][THREADLIB], [AC_REQUIRE([gl_][THREADLIB])])
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LIB_TIMER_TIME=
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AC_SUBST([LIB_TIMER_TIME])
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gl_saved_libs=$LIBS
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AC_SEARCH_LIBS([timer_settime], [rt posix4],
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[test "$ac_cv_search_timer_settime" = "none required" ||
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LIB_TIMER_TIME=$ac_cv_search_timer_settime])
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m4_ifdef([gl_][THREADLIB],
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[dnl GLIBC uses threads to emulate posix timers when kernel support
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dnl is not available (like Linux < 2.6 or when used with kFreeBSD)
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dnl Now the pthread lib is linked automatically in the normal case,
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dnl but when linking statically, it needs to be explicitly specified.
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AC_EGREP_CPP([Thread],
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[#include <features.h>
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#ifdef __GNU_LIBRARY__
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#if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 2) || (__GLIBC__ > 2)) \
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&& !(__UCLIBC__ && __HAS_NO_THREADS__)
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Thread emulation available
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#endif
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#endif
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],
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[LIB_TIMER_TIME="$LIB_TIMER_TIME $LIBMULTITHREAD"])])
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AC_CHECK_FUNCS([timer_settime])
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LIBS=$gl_saved_libs
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])
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