acconfig.h (HAVE_VOLATILE): Insert stub for autoconf.

        * acconfig.h (HAVE_VOLATILE): Insert stub for autoconf.
        * alocal.m4 (GCC_C_VOLATILE): New autoconf test.
        * configure.in: Use GCC_C_VOLATILE.
        * system.h (volatile): Define as empty if no volatile support is
        available.
        * genemit.c (output_add_clobbers): Removed unused variable 'i' from
        generated fucntion.

From-SVN: r19653

gcc/ChangeLog

+Sun May 10 02:27:03 1998  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* acconfig.h (HAVE_VOLATILE): Insert stub for autoconf.
+	* alocal.m4 (GCC_C_VOLATILE): New autoconf test.
+	* configure.in: Use GCC_C_VOLATILE.
+	* system.h (volatile): Define as empty if no volatile support is
+	available.
+
+Sun May 10 01:21:43 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* genemit.c (output_add_clobbers): Removed unused variable 'i' from
+	generated fucntion.
+
 Sat May  9 02:02:15 1998  Richard Henderson  <rth@cygnus.com>
 
 	* loop.c (get_condition): Don't combine when either compare is MODE_CC.

gcc/acconfig.h

@@ -4,6 +4,9 @@
 /* Define if your cpp understands the stringify operator.  */
 #undef HAVE_CPP_STRINGIFY
 
+/* Define if your compiler understands volatile.  */
+#undef HAVE_VOLATILE
+
 /* Define if you have a working <inttypes.h> header file.  */
 #undef HAVE_INTTYPES_H
 

gcc/aclocal.m4

@@ -143,6 +143,16 @@ fi
 AC_SUBST(LN)dnl
 ])
 
+dnl See whether the stage1 host compiler accepts the volatile keyword.
+AC_DEFUN(GCC_C_VOLATILE,
+[AC_CACHE_CHECK([for volatile], gcc_cv_c_volatile,
+[AC_TRY_COMPILE(, [volatile int foo;],
+        gcc_cv_c_volatile=yes, gcc_cv_c_volatile=no)])
+if test $gcc_cv_c_volatile = yes ; then
+  AC_DEFINE(HAVE_VOLATILE)
+fi
+])
+
 AC_DEFUN(EGCS_PROG_INSTALL,
 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
 # Find a good install program.  We prefer a C program (faster),

gcc/config.in

@@ -5,6 +5,9 @@
 /* Define if your cpp understands the stringify operator.  */
 #undef HAVE_CPP_STRINGIFY
 
+/* Define if your compiler understands volatile.  */
+#undef HAVE_VOLATILE
+
 /* Define if you have a working <inttypes.h> header file.  */
 #undef HAVE_INTTYPES_H
 

gcc/configure.in

@@ -143,6 +143,7 @@ AC_PROG_AWK
 AC_PROG_LEX
 GCC_PROG_LN
 GCC_PROG_LN_S
+GCC_C_VOLATILE
 AC_PROG_RANLIB
 AC_PROG_YACC
 EGCS_PROG_INSTALL

gcc/genemit.c

@@ -620,7 +620,6 @@ output_add_clobbers ()
   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
   printf ("     rtx pattern;\n     int insn_code_number;\n");
   printf ("{\n");
-  printf ("  int i;\n\n");
   printf ("  switch (insn_code_number)\n");
   printf ("    {\n");
 

gcc/system.h

@@ -210,6 +210,12 @@ extern char *getenv ();
 extern char *sbrk ();
 #endif
 
+/* HAVE_VOLATILE only refers to the stage1 compiler.  We also check
+   __STDC__ and assume gcc sets it and has volatile in stage >=2. */
+#if !defined(HAVE_VOLATILE) && !defined(__STDC__) && !defined(volatile)
+#define volatile
+#endif
+
 /* Redefine abort to report an internal error w/o coredump, and reporting the
    location of the error in the source file.  */
 #ifndef abort