1# clock_time.m4 serial 6 2dnl Copyright (C) 2002, 2003, 2004, 2005 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 sets LIB_CLOCK_GETTIME. 8AC_DEFUN([gl_CLOCK_TIME], 9[ 10 # dnl Persuade glibc <time.h> to declare these functions. 11 AC_REQUIRE([AC_GNU_SOURCE]) 12 13 # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function. 14 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. 15 16 # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all* 17 # programs in the package would end up linked with that potentially-shared 18 # library, inducing unnecessary run-time overhead. 19 gl_saved_libs=$LIBS 20 AC_SEARCH_LIBS(clock_gettime, [rt posix4], 21 [test "$ac_cv_search_clock_gettime" = "none required" || 22 LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime]) 23 AC_SUBST(LIB_CLOCK_GETTIME) 24 AC_CHECK_FUNCS(clock_gettime clock_settime) 25 LIBS=$gl_saved_libs 26]) 27