Doc: Remove separate "Target Format Checks" section [PR42270]

This is part of an incremental effort to make the chapter on GCC
extensions better organized by grouping/rearranging sections by topic.

Following the last round of patches, there's a leftover section
"Target Format Checks" that didn't fit into any category.  It seems best
to merge this material into the main discussion of the "format" attribute,
in particular because that discussion already contains similar discussion
for mingw/Windows targets.

gcc/ChangeLog
	PR other/42270
	* doc/extend.texi (Function Attributes): Merge text from "Target
	Format Checks" into the main discussion of the format and
	format_arg attributes.
	(Target Format Checks): Delete section.

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index ed766e53dcc448e175b63595a7fc9266bd296d49..e68b810c043b189f6b1ff538b0d6ea441fd74bfb 100644 (file)
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -58,7 +58,6 @@ extensions, accepted by GCC in C90 mode and in C++.
 * New/Delete Builtins:: Built-in functions for C++ allocations and deallocations.
 * Other Builtins::      Other built-in functions.
 * Target Builtins::     Built-in functions specific to particular targets.
-* Target Format Checks:: Format checks specific to particular targets.
 @end menu
 
 @node Additional Numeric Types
@@ -2219,18 +2218,43 @@ for consistency with the @code{printf} style format string argument
 @code{my_format}.
 
 The parameter @var{archetype} determines how the format string is
-interpreted, and should be @code{printf}, @code{scanf}, @code{strftime},
+interpreted.
+Valid archetypes include @code{printf}, @code{scanf}, @code{strftime},
 @code{gnu_printf}, @code{gnu_scanf}, @code{gnu_strftime} or
 @code{strfmon}.  (You can also use @code{__printf__},
-@code{__scanf__}, @code{__strftime__} or @code{__strfmon__}.)  On
-MinGW targets, @code{ms_printf}, @code{ms_scanf}, and
-@code{ms_strftime} are also present.
+@code{__scanf__}, @code{__strftime__} or @code{__strfmon__}.)
 @var{archetype} values such as @code{printf} refer to the formats accepted
 by the system's C runtime library,
 while values prefixed with @samp{gnu_} always refer
-to the formats accepted by the GNU C Library.  On Microsoft Windows
-targets, values prefixed with @samp{ms_} refer to the formats accepted by the
+to the formats accepted by the GNU C Library.
+
+@anchor{Target Format Checks}
+On MinGW and Microsoft Windows targets, @code{ms_printf},
+@code{ms_scanf}, and @code{ms_strftime} are also present.  Values
+prefixed with @samp{ms_} refer to the formats accepted by the
 @file{msvcrt.dll} library.
+
+@anchor{Solaris Format Checks}
+Solaris targets also support the @code{cmn_err} (or @code{__cmn_err__})
+archetype.
+@code{cmn_err} accepts a subset of the standard @code{printf}
+conversions, and the two-argument @code{%b} conversion for displaying
+bit-fields.  See the Solaris man page for @code{cmn_err} for more information.
+
+@anchor{Darwin Format Checks}
+Darwin targets also support the @code{CFString} (or
+@code{__CFString__}) archetype in the @code{format} attribute.
+Declarations with this archetype are parsed for correct syntax
+and argument types.  However, parsing of the format string itself and
+validating arguments against it in calls to such functions is currently
+not performed.
+
+For Objective-C dialects, @code{NSString} (or @code{__NSString__}) is
+recognized in the same context.  Declarations including these format attributes
+are parsed for correct syntax, however the result of checking of such format
+strings is not yet defined, and is not carried out by this version of the
+compiler.
+
 The parameter @var{string-index}
 specifies which argument is the format string argument (starting
 from 1), while @var{first-to-check} is the number of the first
@@ -2265,15 +2289,7 @@ standard modes, the X/Open function @code{strfmon} is also checked as
 are @code{printf_unlocked} and @code{fprintf_unlocked}.
 @xref{C Dialect Options,,Options Controlling C Dialect}.
 
-For Objective-C dialects, @code{NSString} (or @code{__NSString__}) is
-recognized in the same context.  Declarations including these format attributes
-are parsed for correct syntax, however the result of checking of such format
-strings is not yet defined, and is not carried out by this version of the
-compiler.
 
-The target may also provide additional types of format checks.
-@xref{Target Format Checks,,Format Checks Specific to Particular
-Target Machines}.
 
 @cindex @code{format_arg} function attribute
 @opindex Wformat-nonliteral
@@ -2328,13 +2344,17 @@ requested by @option{-ansi} or an appropriate @option{-std} option, or
 is used.  @xref{C Dialect Options,,Options
 Controlling C Dialect}.
 
-For Objective-C dialects, the @code{format-arg} attribute may refer to an
+For Objective-C dialects, the @code{format_arg} attribute may refer to an
 @code{NSString} reference for compatibility with the @code{format} attribute
 above.
 
-The target may also allow additional types in @code{format-arg} attributes.
-@xref{Target Format Checks,,Format Checks Specific to Particular
-Target Machines}.
+Similarly, on Darwin targets @code{CFStringRefs} (defined by the
+@code{CoreFoundation} headers) may also be used as format arguments.
+Note that the relevant headers are only likely to be available on
+Darwin (OSX) installations.  On such installations, the XCode and
+system documentation provide descriptions of @code{CFString},
+@code{CFStringRefs} and associated functions.
+
 
 @cindex @code{gnu_inline} function attribute
 @item gnu_inline
@@ -29555,43 +29575,6 @@ The shadow stack unwind code looks like:
 This code runs unconditionally on all 64-bit processors.  For 32-bit
 processors the code runs on those that support multi-byte NOP instructions.
 
-@node Target Format Checks
-@section Format Checks Specific to Particular Target Machines
-
-For some target machines, GCC supports additional options to the
-format attribute
-(@pxref{Function Attributes,,Declaring Attributes of Functions}).
-
-@menu
-* Solaris Format Checks::
-* Darwin Format Checks::
-@end menu
-
-@node Solaris Format Checks
-@subsection Solaris Format Checks
-
-Solaris targets support the @code{cmn_err} (or @code{__cmn_err__}) format
-check.  @code{cmn_err} accepts a subset of the standard @code{printf}
-conversions, and the two-argument @code{%b} conversion for displaying
-bit-fields.  See the Solaris man page for @code{cmn_err} for more information.
-
-@node Darwin Format Checks
-@subsection Darwin Format Checks
-
-In addition to the full set of format archetypes (attribute format style
-arguments such as @code{printf}, @code{scanf}, @code{strftime}, and
-@code{strfmon}), Darwin targets also support the @code{CFString} (or
-@code{__CFString__}) archetype in the @code{format} attribute.
-Declarations with this archetype are parsed for correct syntax
-and argument types.  However, parsing of the format string itself and
-validating arguments against it in calls to such functions is currently
-not performed.
-
-Additionally, @code{CFStringRefs} (defined by the @code{CoreFoundation} headers) may
-also be used as format arguments.  Note that the relevant headers are only likely to be
-available on Darwin (OSX) installations.  On such installations, the XCode and system
-documentation provide descriptions of @code{CFString}, @code{CFStringRefs} and
-associated functions.
 
 @node C++ Extensions
 @chapter Extensions to the C++ Language