gcc-3.0.3 cpp0 bug?

["Graeme Peterson" <gp at qnx dot com>]

Hi, all.

While trying to port/configure/make gcc-3.0.3 for QNX6, I came upon 
what looks like a cpp0 bug.  We use standard C macros in some
of our system header files, and the xgcc fails when the source
includes any of those headers.

I tested it on Solaris with the 2.95.3 and 3.0.3 packages from
www.sunfreeware.com and came up with the same failure.

Here is my test case.  I made a 'foo.h' file with the C macros
as listed below, and put it in /home/gp.  foo.h uses the macros
to construct the path of an included header file 'subdir/ffoo.h',
which in this case is an empty file.

The net effect is that I want the macros to expand to:
(empty lines deleted from 2.95.3 foo.s)

  # 1 "./foo.h"
  # 1 "subdir/ffoo.h" 1
  # 10 "./foo.h" 2

2.95.3 works, 3.0.3 fails.

Anyone?

Thanks.
GP

=========foo.h============
  /* Two step process because of standard C macro expansion rules */
  #define ___SPLICE(x,y)	x##y
  #define __SPLICE(x,y)	___SPLICE(x,y)
  
  #define _HDR_(hdr)	<##hdr##>
  #define _HDR_DIR_	subdir
  
  #define _SPLICED_HDR_(hdr)	<##__SPLICE(_HDR_DIR_,__SPLICE(/,hdr))##>
  
  #include _SPLICED_HDR_(ffoo.h)
=========end foo.h============

========command lines used ===
  /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/2.95.3/cpp0 /home/gp/foo.h -o foo2953.s -v -I/home/gp
  /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.0.3/cpp0 /home/gp/foo.h -o foo303.s -v -I/home/gp
=====end command lines =======

========output===============
  USING VERSION 2.95.3 cpp0:
  
  GNU CPP version 2.95.3 20010315 (release) (sparc)
  #include "..." search starts here:
  #include <...> search starts here:
   .
   /usr/local/include
   /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/2.95.3/../../../../sparc-sun-solaris2.8/include
   /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/2.95.3/include
   /usr/include
  End of search list.
  The following default directories have been omitted from the search path:
   /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/2.95.3/../../../../include/g++-3
  End of omitted list.
  
  USING VERSION 3.0.3 cpp0:
  
  GNU CPP version 3.0.3 (cpplib) (sparc)
  #include "..." search starts here:
  #include <...> search starts here:
   .
   /usr/local/include
   /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.0.3/include
   /usr/local/sparc-sun-solaris2.8/include
   /usr/include
  End of search list.
  foo.h:10:10: warning: pasting "<" and "__SPLICE" does not give a valid preprocessing token
  foo.h:10:10: warning: pasting "/" and "ffoo" does not give a valid preprocessing token
  foo.h:10:10: warning: pasting ")" and ">" does not give a valid preprocessing token
  foo.h:10:31: __SPLICE(subdir,/ffoo.h): No such file or directory
=============end output==========  

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