Clean up documentation of -Wsuggest-attribute= [PR115532]

The list of -Wsuggest-attribute= variants was out of date in the option
summary (and getting too long to fit on one line), and an index entry was
missing for -Wsuggest-attribute=returns_nonnull.

gcc/c-family/ChangeLog
	PR c/115532
	* c.opt.urls: Regenerated.

gcc/ChangeLog
	PR c/115532
	* common.opt.urls: Regenerated.
	* doc/invoke.texi (Option Summary): Don't try to list all the
	-Wsuggest-attribute= variants inline here.
	(Warning Options): Likewise.  Add @opindex for
	Wsuggest-attribute=returns_nonnull and its no- form.  Remove
	@itemx for no- form.

Co-Authored-By: Peter Eisentraut <peter@eisentraut.org>

gcc/c-family/c.opt.urls

@@ -864,9 +864,6 @@ UrlSuffix(gcc/Warning-Options.html#index-Wno-system-headers)
 Wtemplates
 UrlSuffix(gcc/C_002b_002b-Dialect-Options.html#index-Wno-templates)
 
-Wtautological-compare
-UrlSuffix(gcc/Warning-Options.html#index-Wno-tautological-compare)
-
 Wtemplate-body
 UrlSuffix(gcc/C_002b_002b-Dialect-Options.html#index-Wno-template-body)
 

gcc/common.opt.urls

@@ -223,6 +223,9 @@ UrlSuffix(gcc/Warning-Options.html#index-Wno-suggest-attribute_003dnoreturn)
 Wsuggest-attribute=malloc
 UrlSuffix(gcc/Warning-Options.html#index-Wno-suggest-attribute_003dmalloc)
 
+Wsuggest-attribute=returns_nonnull
+UrlSuffix(gcc/Warning-Options.html#index-Wno-suggest-attribute_003dreturns_005fnonnull)
+
 Wsuggest-final-types
 UrlSuffix(gcc/C_002b_002b-Dialect-Options.html#index-Wno-suggest-final-types)
 
@@ -235,6 +238,9 @@ UrlSuffix(gcc/Warning-Options.html#index-Wno-switch-unreachable)
 Wsystem-headers
 UrlSuffix(gcc/Warning-Options.html#index-Wno-system-headers)
 
+Wtautological-compare
+UrlSuffix(gcc/Warning-Options.html#index-Wno-tautological-compare)
+
 Wtrampolines
 UrlSuffix(gcc/Warning-Options.html#index-Wno-trampolines)
 

gcc/doc/invoke.texi

@@ -416,7 +416,7 @@ Objective-C and Objective-C++ Dialects}.
 -Wstring-compare
 -Wno-stringop-overflow -Wno-stringop-overread
 -Wno-stringop-truncation  -Wstrict-flex-arrays
--Wsuggest-attribute=@r{[}pure@r{|}const@r{|}noreturn@r{|}format@r{|}malloc@r{]}
+-Wsuggest-attribute=@var{attribute-name}
 -Wswitch  -Wno-switch-bool  -Wswitch-default  -Wswitch-enum
 -Wno-switch-outside-range  -Wno-switch-unreachable  -Wsync-nand
 -Wsystem-headers  -Wtautological-compare  -Wtrailing-whitespace
@@ -8354,9 +8354,9 @@ even without optimization.
 
 @opindex Wsuggest-attribute=
 @opindex Wno-suggest-attribute=
-@item -Wsuggest-attribute=@r{[}pure@r{|}const@r{|}noreturn@r{|}format@r{|}cold@r{|}malloc@r{]}returns_nonnull@r{|}
+@item -Wsuggest-attribute=@var{attribute-name}
 Warn for cases where adding an attribute may be beneficial. The
-attributes currently supported are listed below.
+@var{attribute-name}s currently supported are listed below.
 
 @table @gcctabopt
 @opindex Wsuggest-attribute=pure
@@ -8369,16 +8369,18 @@ attributes currently supported are listed below.
 @opindex Wno-missing-noreturn
 @opindex Wsuggest-attribute=malloc
 @opindex Wno-suggest-attribute=malloc
+@opindex Wsuggest-attribute=returns_nonnull
+@opindex Wno-suggest-attribute=returns_nonnull
 @item -Wsuggest-attribute=pure
 @itemx -Wsuggest-attribute=const
 @itemx -Wsuggest-attribute=noreturn
 @itemx -Wmissing-noreturn
 @itemx -Wsuggest-attribute=malloc
 @itemx -Wsuggest-attribute=returns_nonnull
-@itemx -Wno-suggest-attribute=returns_nonnull
 
 Warn about functions that might be candidates for attributes
-@code{pure}, @code{const}, @code{noreturn}, @code{malloc} or @code{returns_nonnull}. The compiler
+@code{pure}, @code{const}, @code{noreturn}, @code{malloc} or
+@code{returns_nonnull}.  The compiler
 only warns for functions visible in other compilation units or (in the case of
 @code{pure} and @code{const}) if it cannot prove that the function returns
 normally. A function returns normally if it doesn't contain an infinite loop or