changes in -Wall

[Jeffrey A Law]

  In message < 199809071523.RAA05630@orcanie.shfj.cea.fr >you write:
  > Here is an excerpt of the documentation of the GNU C compiler:
  > 
  > 	`-Wunknown-pragmas'
  > 	     Warn when a #pragma directive is encountered which is not
  > 	     understood by GCC.  If this command line option is used, warnings
  > 	     will even be issued for unknown pragmas in system header files.
  > 	     This is not the case if the warnings were only enabled by the
  > 	     `-Wall' command line option.
  > 	
  > 	`-Wall'
  > 	     All of the above `-W' options combined.  This enables all the
  > 	     warnings about constructions that some users consider
  > 	     questionable, and that are easy to avoid (or modify to prevent the
  > 	     warning), even in conjunction with macros.
  > 
  > Using egcs-1.1b on Solaris 2.5.1, I compile a C++ file using the
  > following options:
  > 	-ansi
  > 	-O3
  > 	-fPIC
  > 	-Wall
  > 
  > I keep getting warnings in system headers:
  > 
  > * The first one seems in contradiction with the documentation:
  >   	/usr/openwin/include/GL/gl.h:1: warning: ignoring pragma: ignored
I'd bet /usr/openwin isn't considered a system header by the compiler.

Generally system headers are those which live under /usr/include.

  > * The second one is not in contradiction with the documentation.
  >   However, using -Wall, I used not to get this warning - up to
  >   egcs-1.0.3a. It is of course very annoying, as X11 headers are full
  >   of such function declarations. How to shut up this warning and keep
  >   the -Wall option in the same time?
  >   	/usr/openwin/include/X11/Xutil.h:867: warning: return-type of `XXorRegi
  > on' defaults to `int'
  > 
  > Is this a bug? What should I do to correct it?
This is a bug in the  X11 header files, not egcs.

jeff