Re: preprocessor/6521: -MG creates dependency with wrong path

[Zack Weinberg <zack@codesourcery.com>]

The following reply was made to PR preprocessor/6521; it has been noted by GNATS.

From: Zack Weinberg <zack@codesourcery.com>
To: Neil Booth <neil@daikokuya.demon.co.uk>
Cc: rspier@pobox.com, gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org
Subject: Re: preprocessor/6521: -MG creates dependency with wrong path
Date: Fri, 3 May 2002 09:46:25 -0700

 On Fri, May 03, 2002 at 01:54:10PM +0100, Neil Booth wrote:
 > rspier@pobox.com wrote:-
 > 
 > > >Description:
 > > gcc or g++ -MG outputs incorrect dependency information when there is a nonexistent header file specified in angle brackets.  (i.e. #include <...>)
 > > 
 > > It uses the path of the first specified -I argument (or the first system directory, if no directory is specified.)
 > > 
 > > The attached script demonstrates the problem.  
 > > 
 > > #include "some/header.h"
 > > #include <nonexistent.h>
 > > int main() {
 > > }
 > > gcc3 -M -MG /tmp/_16336//test.c -I/tmp/_16336//not/a/real/path
 > > test.o: /tmp/_16336/test.c some/header.h \
 > >   /tmp/_16336/not/a/real/path/nonexistent.h
 > > >How-To-Repeat:
 > > (Run attached script.)
 > 
 > This is intended behaviour (but undocumented I think); whether it is
 > desirable or not is a different question.
 > 
 > IMO this is not worth fixing; and we should just document the behaviour
 > for <> headers.  What do you think, Zack?
 
 Agreed.
 
 zw