invoke.texi (-ansi): Mention explicitly corresponding -std= options.

2008-01-31  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	* doc/invoke.texi (-ansi): Mention explicitly corresponding -std=
	options. Minor fixes.
	(-std): Move reference to standards closer to where language
	standards are first mentioned.

From-SVN: r131980

gcc/ChangeLog

+2008-01-31  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>
+
+	* doc/invoke.texi (-ansi): Mention explicitly corresponding -std=
+	options. Minor fixes.
+	(-std): Move reference to standards closer to where language
+	standards are first mentioned.
+	
 2008-01-31  Richard Sandiford  <rsandifo@nildram.co.uk>
 
 	PR rtl-optimization/34995

gcc/doc/invoke.texi

@@ -1294,8 +1294,8 @@ accepts:
 @cindex ISO support
 @item -ansi
 @opindex ansi
-In C mode, support all ISO C90 programs.  In C++ mode,
-remove GNU extensions that conflict with ISO C++.
+In C mode, this is equivalent to @samp{-std=c89}. In C++ mode, it is
+equivalent to @samp{-std=c++98}.
 
 This turns off certain features of GCC that are incompatible with ISO
 C90 (when compiling C code), or of standard C++ (when compiling C++ code),
@@ -1324,17 +1324,19 @@ from declaring certain functions or defining certain macros that the
 ISO standard doesn't call for; this is to avoid interfering with any
 programs that might use these names for other things.
 
-Functions which would normally be built in but do not have semantics
+Functions that would normally be built in but do not have semantics
 defined by ISO C (such as @code{alloca} and @code{ffs}) are not built-in
-functions with @option{-ansi} is used.  @xref{Other Builtins,,Other
+functions when @option{-ansi} is used.  @xref{Other Builtins,,Other
 built-in functions provided by GCC}, for details of the functions
 affected.
 
 @item -std=
 @opindex std
-Determine the language standard.  This option is currently only
-supported when compiling C or C++.  A value for this option must be
-provided; possible values are
+Determine the language standard. @xref{Standards,,Language Standards
+Supported by GCC}, for details of these standard versions.  This option
+is currently only supported when compiling C or C++. 
+
+A value for this option must be provided; possible values are
 
 @table @samp
 @item c89
@@ -1390,9 +1392,6 @@ effects as @option{-ansi}, except that features that were not in ISO C90
 but are in the specified version (for example, @samp{//} comments and
 the @code{inline} keyword in ISO C99) are not disabled.
 
-@xref{Standards,,Language Standards Supported by GCC}, for details of
-these standard versions.
-
 @item -fgnu89-inline
 @opindex fgnu89-inline
 The option @option{-fgnu89-inline} tells GCC to use the traditional