AC_DEFINE([HAVE_GCC_HAS_NO_UNIT_AT_A_TIME], [1], [Define to 1 if gcc supports -fno-unit-at-a-time.])
fi])
+# FP_GCC_HAS_WRAPV
+# --------------------------
+AC_DEFUN([FP_GCC_HAS_WRAPV],
+[AC_REQUIRE([FP_HAVE_GCC])
+AC_CACHE_CHECK([whether gcc has -fwrapv], [fp_cv_gcc_has_wrapv],
+[FP_COMPARE_VERSIONS([$fp_gcc_version], [-ge], [3.4],
+ [fp_cv_gcc_has_wrapv=yes],
+ [fp_cv_gcc_has_wrapv=no])])
+if test "$fp_cv_gcc_has_wrapv" = "yes"; then
+ AC_DEFINE([HAVE_GCC_HAS_WRAPV], [1], [Define to 1 if gcc supports -fwrapv.])
+fi])
+
# FP_SETUP_PROJECT_VERSION
# ---------------------
AC_DEFUN([FP_SETUP_PROJECT_VERSION],
++ split_opt
++ include_paths
++ pkg_extra_cc_opts
+#ifdef HAVE_GCC_HAS_WRAPV
+ -- We need consistent integer overflow (trac #952)
+ ++ ["-fwrapv"]
+#endif
))
return (next_phase, dflags, maybe_loc, output_fn)
FP_MINGW_GCC
FP_GCC_NEEDS_NO_OMIT_LFPTR
FP_GCC_HAS_NO_UNIT_AT_A_TIME
+FP_GCC_HAS_WRAPV
dnl ** figure out how to invoke cpp directly (gcc -E is no good)
AC_PROG_CPP