Use AX_CHECK_COMPILE_FLAG

Author: StanFromIreland

configure

@@ -2234,21 +2234,13 @@ AC_ARG_WITH([strict-overflow],
        dnl is defined behaviour via twos-complement.
        dnl Set STRICT_OVERFLOW_CFLAGS and NO_STRICT_OVERFLOW_CFLAGS depending on compiler support.
        dnl Pass the latter to modules that depend on such behaviour.
-       _SAVE_VAR([CFLAGS])
-       CFLAGS="-fstrict-overflow -fno-strict-overflow"
-       AC_CACHE_CHECK([if $CC supports -fstrict-overflow and -fno-strict-overflow],
-                      [ac_cv_cc_supports_fstrict_overflow],
-         AC_COMPILE_IFELSE(
-           [AC_LANG_PROGRAM([[]], [[]])],
-           [ac_cv_cc_supports_fstrict_overflow=yes],
-           [ac_cv_cc_supports_fstrict_overflow=no]
-         )
-       )
-       _RESTORE_VAR([CFLAGS])
-
-       AS_VAR_IF([ac_cv_cc_supports_fstrict_overflow], [yes],
-         [STRICT_OVERFLOW_CFLAGS="-fstrict-overflow"
-          NO_STRICT_OVERFLOW_CFLAGS="-fno-strict-overflow"],
+       AX_CHECK_COMPILE_FLAG([-fstrict-overflow],
+         [AX_CHECK_COMPILE_FLAG([-fno-strict-overflow],
+           [STRICT_OVERFLOW_CFLAGS="-fstrict-overflow"
+            NO_STRICT_OVERFLOW_CFLAGS="-fno-strict-overflow"],
+           [AC_MSG_WARN([--with-strict-overflow=yes requires a compiler that supports -fno-strict-overflow])
+            STRICT_OVERFLOW_CFLAGS=""
+            NO_STRICT_OVERFLOW_CFLAGS=""])],
          [AC_MSG_WARN([--with-strict-overflow=yes requires a compiler that supports -fstrict-overflow])
           STRICT_OVERFLOW_CFLAGS=""
           NO_STRICT_OVERFLOW_CFLAGS=""])