toplev.c (documented_lang_options): Document more language-specific options.

	* toplev.c (documented_lang_options): Document more
	language-specific options.
	* doc/invoke.texi (Warning Options): Correct documentation for
	-Wno-multichar, -Wno-div-by-zero, and -Wsystem-headers.
	* c-decl.c (c_decode_option): Use a table to handle warning options.

From-SVN: r50299

1 files changed, 18 insertions, 13 deletions

diff --git a/gcc/toplev.c b/gcc/toplev.c
index 9ff37c3..93cb2c9 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1231,7 +1231,6 @@ documented_lang_options[] =
   { "-Wbad-function-cast",
     N_("Warn about casting functions to incompatible types") },
   { "-Wno-bad-function-cast", "" },
-  { "-Wno-missing-noreturn", "" },
   { "-Wmissing-format-attribute",
     N_("Warn about functions which might be candidates for format attributes") },
   { "-Wno-missing-format-attribute", "" },
@@ -1250,12 +1249,15 @@ documented_lang_options[] =
   { "-Wconversion", 
     N_("Warn about possibly confusing type conversions") },
   { "-Wno-conversion", "" },
+  { "-Wdiv-by-zero", "" },
+  { "-Wno-div-by-zero", 
+    N_("Do not warn about compile-time integer division by zero") },
+  { "-Wfloat-equal", 
+    N_("Warn about testing equality of floating point numbers") },
+  { "-Wno-float-equal", "" },
   { "-Wformat", 
     N_("Warn about printf/scanf/strftime/strfmon format anomalies") },
   { "-Wno-format", "" },
-  { "-Wformat-y2k", "" },
-  { "-Wno-format-y2k",
-    N_("Don't warn about strftime formats yielding 2 digit years") },
   { "-Wformat-extra-args", "" },
   { "-Wno-format-extra-args",
     N_("Don't warn about too many arguments to format functions") },
@@ -1265,6 +1267,9 @@ documented_lang_options[] =
   { "-Wformat-security",
     N_("Warn about possible security problems with format functions") },
   { "-Wno-format-security", "" },
+  { "-Wformat-y2k", "" },
+  { "-Wno-format-y2k",
+    N_("Don't warn about strftime formats yielding 2 digit years") },
   { "-Wimplicit-function-declaration",
     N_("Warn about implicit function declarations") },
   { "-Wno-implicit-function-declaration", "" },
@@ -1301,24 +1306,21 @@ documented_lang_options[] =
   { "-Wparentheses", 
     N_("Warn about possible missing parentheses") },
   { "-Wno-parentheses", "" },
-  { "-Wsequence-point",
-    N_("Warn about possible violations of sequence point rules") },
-  { "-Wno-sequence-point", "" },
   { "-Wpointer-arith", 
     N_("Warn about function pointer arithmetic") },
   { "-Wno-pointer-arith", "" },
   { "-Wredundant-decls",
     N_("Warn about multiple declarations of the same object") },
   { "-Wno-redundant-decls", "" },
+  { "-Wreturn-type",
+    N_("Warn whenever a function's return-type defaults to int") },
+  { "-Wno-return-type", "" },
+  { "-Wsequence-point",
+    N_("Warn about possible violations of sequence point rules") },
+  { "-Wno-sequence-point", "" },
   { "-Wsign-compare", 
     N_("Warn about signed/unsigned comparisons") },
   { "-Wno-sign-compare", "" },
-  { "-Wfloat-equal", 
-    N_("Warn about testing equality of floating point numbers") },
-  { "-Wno-float-equal", "" },
-  { "-Wunknown-pragmas", 
-    N_("Warn about unrecognized pragmas") },
-  { "-Wno-unknown-pragmas", "" },
   { "-Wstrict-prototypes", 
     N_("Warn about non-prototyped function decls") },
   { "-Wno-strict-prototypes", "" },
@@ -1330,6 +1332,9 @@ documented_lang_options[] =
   { "-Wno-trigraphs", "" },
   { "-Wundef", "" },
   { "-Wno-undef", "" },
+  { "-Wunknown-pragmas", 
+    N_("Warn about unrecognized pragmas") },
+  { "-Wno-unknown-pragmas", "" },
   { "-Wwrite-strings", 
     N_("Mark strings as 'const char *'") },
   { "-Wno-write-strings", "" },