1# clock_time.m4 serial 10 2dnl Copyright (C) 2002-2006, 2009-2014 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl 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) $(LIB_CLOCK_GETTIME) 11 12AC_DEFUN([gl_CLOCK_TIME], 13[ 14 dnl Persuade glibc and Solaris <time.h> to declare these functions. 15 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) 16 17 # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function. 18 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. 19 20 # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all* 21 # programs in the package would end up linked with that potentially-shared 22 # library, inducing unnecessary run-time overhead. 23 LIB_CLOCK_GETTIME= 24 AC_SUBST([LIB_CLOCK_GETTIME]) 25 gl_saved_libs=$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]) 32