| # clock_time.m4 serial 10 |
| dnl Copyright (C) 2002-2006, 2009-2021 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| # Check for clock_gettime and clock_settime, and set LIB_CLOCK_GETTIME. |
| # For a program named, say foo, you should add a line like the following |
| # in the corresponding Makefile.am file: |
| # foo_LDADD = $(LDADD) $(LIB_CLOCK_GETTIME) |
| |
| AC_DEFUN([gl_CLOCK_TIME], |
| [ |
| dnl Persuade glibc and Solaris <time.h> to declare these functions. |
| AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
| |
| # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function. |
| # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. |
| |
| # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all* |
| # programs in the package would end up linked with that potentially-shared |
| # library, inducing unnecessary run-time overhead. |
| LIB_CLOCK_GETTIME= |
| AC_SUBST([LIB_CLOCK_GETTIME]) |
| gl_saved_libs=$LIBS |
| AC_SEARCH_LIBS([clock_gettime], [rt posix4], |
| [test "$ac_cv_search_clock_gettime" = "none required" || |
| LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime]) |
| AC_CHECK_FUNCS([clock_gettime clock_settime]) |
| LIBS=$gl_saved_libs |
| ]) |
