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gcc-3.2 -MD -o misbehaviour
- From: Martin Pool <mbp at samba dot org>
- To: bje at redhat dot com, gcc at gcc dot gnu dot org,Alexandre Oliva <oliva at lsd dot ic dot unicamp dot br>
- Cc: distcc at lists dot samba dot org
- Date: Wed, 2 Oct 2002 15:36:42 +1000
- Subject: gcc-3.2 -MD -o misbehaviour
- References: <2683.198.102.182.67.1033413284.squirrel@mercury.axian.com> <20020930220940.GA1213@toey.sourcefrog.net> <4710.198.102.182.67.1033427430.squirrel@mercury.axian.com> <20020930234356.GA14232@samba.org> <62621.216.99.197.112.1033440272.squirrel@mercury.axian.com> <20021001060338.GE14232@samba.org> <2960.198.102.182.102.1033495681.squirrel@mercury.axian.com>
The manual from Debian Sid's gcc-3.2 (3.2.1-0pre3) says
If `-MD' is used in conjunction with `-E', any `-o' switch is
understood to specify the dependency output file (but *note
-MF::), but if used without `-E', each `-o' is understood to
specify a target object file.
But this doesn't happen:
!1169 15:18 /tmp/test% ls -l
total 4
-rw-r--r-- 1 mbp mbp 76 2002-10-02 14:44 hello.c
!1171 15:18 /tmp/test% gcc-3.2 -MD -E -o hello.out hello.c
!1172 15:18 /tmp/test% ls -la
total 80
drwxr-xr-x 2 mbp mbp 4096 2002-10-02 15:18 .
drwxrwxrwt 15 root root 49152 2002-10-02 15:17 ..
-rw-r--r-- 1 mbp mbp 76 2002-10-02 14:44 hello.c
-rw-r--r-- 1 mbp mbp 536 2002-10-02 15:18 hello.d
-rw-r--r-- 1 mbp mbp 18019 2002-10-02 15:18 hello.out
Actually I'm glad, this doesn't work. Overriding -o to specify the
destination of dependency output seems needlessly complex since there
is already -MF. Personally I'd prefer you pull this out of the
documentation rather than making -o actually specify the output file.
--
Martin