- case $ac_cv_have_decl_gethrtime,$gl_cv_arithmetic_hrtime_t in
- yes,yes) ;;
- *)
- AC_LIBOBJ([gethrxtime])
- gl_PREREQ_GETHRXTIME;;
- esac
+ if test $ac_cv_have_decl_gethrtime = no \
+ || test $gl_cv_arithmetic_hrtime_t = no; then
+ dnl Find libraries needed to link lib/gethrxtime.c.
+ AC_REQUIRE([gl_CLOCK_TIME])
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+ AC_CHECK_FUNCS_ONCE([nanouptime])
+ if test $ac_cv_func_nanouptime != yes; then
+ AC_CACHE_CHECK([whether CLOCK_MONOTONIC or CLOCK_REALTIME is defined],
+ [gl_cv_have_clock_gettime_macro],
+ [AC_EGREP_CPP([have_clock_gettime_macro],
+ [
+# include <time.h>
+# if defined CLOCK_MONOTONIC || defined CLOCK_REALTIME
+ have_clock_gettime_macro
+# endif
+ ],
+ [gl_cv_have_clock_gettime_macro=yes],
+ [gl_cv_have_clock_gettime_macro=no])])
+ if test $gl_cv_have_clock_gettime_macro = yes; then
+ LIB_GETHRXTIME=$LIB_CLOCK_GETTIME
+ fi
+ fi
+ fi