55 lines
2.0 KiB
Plaintext
55 lines
2.0 KiB
Plaintext
# clock_time.m4
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# serial 14
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dnl Copyright (C) 2002-2006, 2009-2024 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 clock_getres, clock_gettime and clock_settime,
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# and set CLOCK_TIME_LIB.
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# For a program named, say foo, you should add a line like the following
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# in the corresponding Makefile.am file:
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# foo_LDADD = $(LDADD) $(CLOCK_TIME_LIB)
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AC_DEFUN([gl_CLOCK_TIME],
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[
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AC_REQUIRE([AC_CANONICAL_HOST])
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dnl Persuade glibc and Solaris <time.h> to declare these functions.
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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# On mingw, these functions are defined in the libwinpthread library,
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# which is better avoided. In fact, the clock_gettime function is buggy
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# in 32-bit mingw, when -D__MINGW_USE_VC2005_COMPAT is used (which Gnulib's
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# year2038 module does): It leaves the upper 32 bits of the tv_sec field
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# of the result uninitialized.
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# Solaris 2.5.1 needs -lposix4 to get the clock_gettime function.
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# Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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# Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all*
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# programs in the package would end up linked with that potentially-shared
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# library, inducing unnecessary run-time overhead.
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CLOCK_TIME_LIB=
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AC_SUBST([CLOCK_TIME_LIB])
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case "$host_os" in
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mingw* | windows*)
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ac_cv_func_clock_getres=no
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ac_cv_func_clock_gettime=no
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ac_cv_func_clock_settime=no
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;;
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*)
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gl_saved_libs=$LIBS
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AC_SEARCH_LIBS([clock_gettime], [rt posix4],
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[test "$ac_cv_search_clock_gettime" = "none required" ||
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CLOCK_TIME_LIB=$ac_cv_search_clock_gettime])
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AC_CHECK_FUNCS([clock_getres clock_gettime clock_settime])
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LIBS=$gl_saved_libs
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;;
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esac
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# For backward compatibility.
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LIB_CLOCK_GETTIME="$CLOCK_TIME_LIB"
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AC_SUBST([LIB_CLOCK_GETTIME])
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])
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