configure.in: Add cpp stringify test.

        * configure.in: Add cpp stringify test.
        * acconfig.h (HAVE_CPP_STRINGIFY): New tag.
        * gengenrtl.c: Use it.
        * configure, config.in: Rebuild.

From-SVN: r17419

gcc/ChangeLog

+Mon Jan 19 10:11:52 1998  Richard Henderson  <rth@cygnus.com>
+
+	* configure.in: Add cpp stringify test.
+	* acconfig.h (HAVE_CPP_STRINGIFY): New tag.
+	* gengenrtl.c: Use it.
+	* configure, config.in: Rebuild.
+
 Mon Jan 19 09:43:15 1998  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>
 
         * Makefile.in (genrtl.c genrtl.h): Add dummy command for GNU make.

gcc/acconfig.h

+/* Define if your cpp understands the stringify operator.  */
+#undef HAVE_CPP_STRINGIFY
+
 /* Define if you have a working <inttypes.h> header file.  */
 #undef HAVE_INTTYPES_H
 

gcc/config.in

 /* config.in.  Generated automatically from configure.in by autoheader.  */
+/* Define if your cpp understands the stringify operator.  */
+#undef HAVE_CPP_STRINGIFY
+
 /* Define if you have a working <inttypes.h> header file.  */
 #undef HAVE_INTTYPES_H
 

gcc/configure.in

@@ -151,6 +151,19 @@ AC_CHECK_HEADERS(limits.h stddef.h string.h strings.h stdlib.h time.h fcntl.h un
 AC_CHECK_HEADER(thread.h, [have_thread_h=yes], [have_thread_h=])
 AC_CHECK_HEADER(pthread.h, [have_pthread_h=yes], [have_pthread_h=])
 
+# See if the system preprocessor understands the ANSI C preprocessor
+# stringification operator.
+AC_MSG_CHECKING(whether cpp understands the stringify operator)
+AC_CACHE_VAL(gcc_cv_c_have_stringify,
+[AC_TRY_COMPILE(,
+[#define S(x)   #x
+char *test = S(foo);],
+gcc_cv_c_have_stringify=yes, gcc_cv_c_have_stringify=no)])
+AC_MSG_RESULT($gcc_cv_c_have_stringify)
+if test $gcc_cv_c_have_stringify = yes; then
+  AC_DEFINE(HAVE_CPP_STRINGIFY)
+fi
+
 # Use <inttypes.h> only if it exists,
 # doesn't clash with <sys/types.h>, and declares intmax_t.
 AC_MSG_CHECKING(for inttypes.h)

gcc/gengenrtl.c

@@ -35,7 +35,7 @@ struct rtx_definition
   const char *enumname, *name, *format;
 };
 
-#ifdef __STDC__
+#if defined(HAVE_CPP_STRINGIFY) || (defined(__GNUC__) && defined(__STDC__))
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { # ENUM, NAME, FORMAT },
 #else
 #define DEF_RTL_EXPR(ENUM, NAME, FORMAT, CLASS) { "ENUM", NAME, FORMAT },