c.opt: Add -W(no-)overlength-strings.

gcc:
	* c.opt: Add -W(no-)overlength-strings.
	* doc/invoke.texi: Document it.
	* c-opts.c (c_common_handle_option): -pedantic implies
	-Woverlength-strings, if not explicitly disabled already.
	(c_common_post_options): -Woverlength-strings defaults to off, and
	is always off for C++.
	* c-common.c (fix_string_type): Issue warning about strings longer
	than is portable only if warn_overlength_strings.  Rearrange code
	a little for clarity.
	* configure.in: Check for -Wno-overlength-strings as well before
	enabling -pedantic in stage 1.
	* Makefile.in (STRICT2_WARN): Add -Wno-overlength-strings.
	(gcc.o-warn, insn-automata.o-warn, build/gencondmd.o-warn): Delete.

	* genconditions.c (write_header, write_one_condition)
	(write_conditions, write_writer): Consolidate very long strings
	that were broken up to fit in C89 portable limit.  Don't use
	printf when fputs will do.

gcc/testsuite:
	* gcc.dg/Woverlength-strings.c
	* gcc.dg/Woverlength-strings-pedantic-c89.c
	* gcc.dg/Woverlength-strings-pedantic-c89-no.c
	* gcc.dg/Woverlength-strings-pedantic-c99.c
	* gcc.dg/Woverlength-strings-pedantic-c99-no.c: New tests.

==================================================================

From-SVN: r110360

1 files changed, 19 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/Woverlength-strings.c b/gcc/testsuite/gcc.dg/Woverlength-strings.c
new file mode 100644
index 0000000..d02e18e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/Woverlength-strings.c
@@ -0,0 +1,19 @@
+/* -Woverlength-strings complains about string constants which are too long
+   for the C standard's "minimum maximum" limits.  It is off by default,
+   but implied by -pedantic.  */
+
+/* { dg-options "" } */
+
+#define TEN "xxxxxxxxxx"
+#define HUN TEN TEN TEN TEN TEN  TEN TEN TEN TEN TEN
+#define THO HUN HUN HUN HUN HUN  HUN HUN HUN HUN HUN
+
+/* C89's minimum-maximum is 509. */
+const char x510[] = HUN HUN HUN HUN HUN TEN;
+
+/* C99's minimum-maximum is 4095.  */
+const char x4096[] =
+  THO THO THO THO     /* 4000 */
+  TEN TEN TEN TEN TEN /* 4050 */
+  TEN TEN TEN TEN     /* 4090 */
+  "123456";