re PR c/2291 (Pedantic may be too pedantic)

	* invoke.texi: Document meaning of -pedantic when -std=gnu* is
	used.  Fixes PR c/2291.
	* gcc.1: Regenerate.

From-SVN: r42340

gcc/ChangeLog

+2001-05-20  Joseph S. Myers  <jsm28@cam.ac.uk>
+
+	* invoke.texi: Document meaning of -pedantic when -std=gnu* is
+	used.  Fixes PR c/2291.
+	* gcc.1: Regenerate.
+
 2001-05-20  Stephane Carrez  <Stephane.Carrez@worldnet.fr>
 
 	* config/m68hc11/m68hc11.c (m68hc11_override_options): Ignore

gcc/invoke.texi

@@ -1695,6 +1695,16 @@ some instances, but would require considerable additional work and would
 be quite different from @samp{-pedantic}.  We don't have plans to
 support such a feature in the near future.
 
+Where the standard specified with @option{-std} represents a GNU
+extended dialect of C, such as @samp{gnu89} or @samp{gnu99}, there is a
+corresponding @dfn{base standard}, the version of ISO C on which the GNU
+extended dialect is based.  Warnings from @option{-pedantic} are given
+where they are required by the base standard.  (It would not make sense
+for such warnings to be given only for features not in the specified GNU
+C dialect, since by definition the GNU dialects of C include all
+features the compiler supports with the given option, and there would be
+nothing to warn about.)
+
 @item -pedantic-errors
 Like @samp{-pedantic}, except that errors are produced rather than
 warnings.