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1 | # clock_time.m4 serial 10 |
2 | dnl Copyright (C) 2002-2006, 2009-2012 Free Software Foundation, Inc. | |
3 | dnl This file is free software; the Free Software Foundation | |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | # Check for clock_gettime and clock_settime, and set LIB_CLOCK_GETTIME. | |
8 | # For a program named, say foo, you should add a line like the following | |
9 | # in the corresponding Makefile.am file: | |
10 | # foo_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME) | |
11 | ||
12 | AC_DEFUN([gl_CLOCK_TIME], | |
13 | [ | |
14 | dnl Persuade glibc and Solaris <time.h> to declare these functions. | |
15 | AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) | |
16 | ||
17 | # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function. | |
18 | # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. | |
19 | ||
20 | # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all* | |
21 | # programs in the package would end up linked with that potentially-shared | |
22 | # library, inducing unnecessary run-time overhead. | |
23 | LIB_CLOCK_GETTIME= | |
24 | AC_SUBST([LIB_CLOCK_GETTIME]) | |
25 | gl_saved_libs=$LIBS | |
26 | AC_SEARCH_LIBS([clock_gettime], [rt posix4], | |
27 | [test "$ac_cv_search_clock_gettime" = "none required" || | |
28 | LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime]) | |
29 | AC_CHECK_FUNCS([clock_gettime clock_settime]) | |
30 | LIBS=$gl_saved_libs | |
31 | ]) |