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Diffstat (limited to 'm4/clock_time.m4')
| -rw-r--r-- | m4/clock_time.m4 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/m4/clock_time.m4 b/m4/clock_time.m4 new file mode 100644 index 000000000..fb3a17a6c --- /dev/null +++ b/m4/clock_time.m4 @@ -0,0 +1,38 @@ +# clock_time.m4 serial 10 +dnl Copyright (C) 2002-2006, 2009-2012 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], + [if test "$ac_cv_search_clock_gettime" = "none required"; then + AC_SEARCH_LIBS([clock_getcpuclockid], [rt posix4], + [test "$ac_cv_search_clock_getcpuclockid" = "none required" \ + || LIB_CLOCK_GETTIME=$ac_cv_search_clock_getcpuclockid], + [test "$ac_cv_search_clock_gettime" = "none required" \ + || LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime]) + else + LIB_CLOCK_GETTIME=$ac_cv_search_clock_gettime + fi]) + AC_CHECK_FUNCS([clock_gettime clock_settime clock_getcpuclockid]) + LIBS=$gl_saved_libs +]) |