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Date: Mon, 15 Apr 2002 09:46:00 -0000
From: corsepiu@faw.uni-ulm.de
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Subject: preprocessor/6310: gcc -MF vs. depcomp
X-SW-Source: 2002-04/txt/msg00779.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         6310
>Category:       preprocessor
>Synopsis:       gcc -MF vs. depcomp
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Apr 15 09:46:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Ralf Corsepius
>Release:        gcc-3.0.5 (20020410)
>Organization:
>Environment:
Linux i386/ELF
>Description:
automake > 1.4's depcomp uses
  "$@" -MT "$object" -MD -MP -MF "$tmpdepfile"
to compute dependencies.

This basically causes it to invoke gcc this way:
gcc -g -O2 -c hello.c -MT hello.o -MD -MP -MF .deps/hello.TPo

Which now causes warning of this kind:
gcc: unrecognized option `-MF'

This has worked for gcc-3.0.x up to 3.0.4, but has stopped working with post-3.0.4 gcc's from the gcc-3.0-branch.

AFAI understand, probably this patch below is the origin of this problem:

2002-03-24  Neil Booth  <neil@daikokuya.demon.co.uk>

	preprocessor/3951
	* gcc.c (cpp_options): Pass -MD through as -MD not -M -MF.       
>How-To-Repeat:
Compile an arbitrary C-sources with gcc-3.0.5 from CVS/gcc-3-0-branch depcomp-style:

Eg.:
gcc -g -O2 -c hello.c -MT hello.o -MD -MP -MF deps/hello.TPo

gcc: unrecognized option `-MF'
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: