| 1 | # clock_time.m4 serial 11
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| 2 | dnl Copyright (C) 2002-2006, 2009-2022 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | # Check for clock_getres, clock_gettime and clock_settime,
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| 8 | # and set LIB_CLOCK_GETTIME.
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| 9 | # For a program named, say foo, you should add a line like the following
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| 10 | # in the corresponding Makefile.am file:
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| 11 | # foo_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME)
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| 12 |
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| 13 | AC_DEFUN([gl_CLOCK_TIME],
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| 14 | [
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| 15 | dnl Persuade glibc and Solaris <time.h> to declare these functions.
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| 16 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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| 17 |
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| 18 | # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function.
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| 19 | # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
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| 20 |
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| 21 | # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all*
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| 22 | # programs in the package would end up linked with that potentially-shared
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| 23 | # library, inducing unnecessary run-time overhead.
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| 24 | LIB_CLOCK_GETTIME=
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| 25 | AC_SUBST([LIB_CLOCK_GETTIME])
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| 26 | gl_saved_libs=$LIBS
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| 27 | AC_SEARCH_LIBS([clock_gettime], [rt posix4],
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| 28 | [test "$ac_cv_search_clock_gettime" = "none required" ||
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| 29 | LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime])
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| 30 | AC_CHECK_FUNCS([clock_getres clock_gettime clock_settime])
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| 31 | LIBS=$gl_saved_libs
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| 32 | ])
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