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27 lines
1.1 KiB
Plaintext
27 lines
1.1 KiB
Plaintext
# clock_time.m4 serial 6
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dnl Copyright (C) 2002, 2003, 2004, 2005 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_gettime and clock_settime, and sets LIB_CLOCK_GETTIME.
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AC_DEFUN([gl_CLOCK_TIME],
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[
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# dnl Persuade glibc <time.h> to declare these functions.
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AC_REQUIRE([AC_GNU_SOURCE])
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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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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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LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
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AC_SUBST(LIB_CLOCK_GETTIME)
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AC_CHECK_FUNCS(clock_gettime clock_settime)
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LIBS=$gl_saved_libs
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])
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