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Diffstat (limited to 'gl/m4/clock_time.m4')
| -rw-r--r-- | gl/m4/clock_time.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gl/m4/clock_time.m4 b/gl/m4/clock_time.m4 new file mode 100644 index 0000000..d624a73 --- /dev/null +++ b/gl/m4/clock_time.m4 @@ -0,0 +1,35 @@ +# clock_time.m4 serial 12 +dnl Copyright (C) 2002-2006, 2009-2023 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_getres, clock_gettime and clock_settime, +# and set CLOCK_TIME_LIB. +# For a program named, say foo, you should add a line like the following +# in the corresponding Makefile.am file: +# foo_LDADD = $(LDADD) $(CLOCK_TIME_LIB) + +AC_DEFUN([gl_CLOCK_TIME], +[ + dnl Persuade glibc and Solaris <time.h> to declare these functions. + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + # Solaris 2.5.1 needs -lposix4 to get the clock_gettime function. + # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. + + # Save and restore LIBS so e.g., -lrt, isn't added to it. Otherwise, *all* + # programs in the package would end up linked with that potentially-shared + # library, inducing unnecessary run-time overhead. + CLOCK_TIME_LIB= + AC_SUBST([CLOCK_TIME_LIB]) + gl_saved_libs=$LIBS + AC_SEARCH_LIBS([clock_gettime], [rt posix4], + [test "$ac_cv_search_clock_gettime" = "none required" || + CLOCK_TIME_LIB=$ac_cv_search_clock_gettime]) + AC_CHECK_FUNCS([clock_getres clock_gettime clock_settime]) + LIBS=$gl_saved_libs + # For backward compatibility. + LIB_CLOCK_GETTIME="$CLOCK_TIME_LIB" + AC_SUBST([LIB_CLOCK_GETTIME]) +]) |