Paul Brook - [RFC] fixproto and canadian cross builds (original) (raw)

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• From: Paul Brook
• To: gcc at gcc dot gnu dot org
• Date: Wed, 23 Nov 2005 18:56:24 +0000
• Subject: [RFC] fixproto and canadian cross builds

I'm having problems building a canadian cross to a target that uses fixproto (m68k-elf). There seems to be some inconsistency in how fix-headers is build/run.

In gcc/Makefile.in we have the following comments:

gen-protos and fix-header are compiled with CC_FOR_BUILD, but they are only

used in native and host-x-target builds, so it's safe to link them with

libiberty.a.

...

This is nominally a 'build' program, but it's run only when host==build,

so we can (indeed, must) use (LIBDEPS)and(LIBDEPS) and (LIBDEPS)and(LIBS).

build/fix-header$(build_exeext): build/fix-header.o build/scan-decls.o
...

We can't run fixproto (it's being built for a different host), but we still

need to install it so that the user can run it when the compiler is

installed.

stmp-install-fixproto: fixproto fixhdr.ready

This suggests two options on what's supposed to happen: (a) fix-header should actually be compiled for the "host" environment. If host==build we run it, otherwise we just install it and let the user run it on the build system. (b) fix-header should be compiled for the "build" environment. This currently isn't possible for canadian crosses because it uses bits of code only compiled for the host. We need to fix this, and there's no point trying to install it because it won't run on the host system (ie. we can remove all the stmp-install-fixproto stuff). (c) fixproto is only for crufty old systems no-one really cares about. It should be disabled by default, and documented to not work for canadian crosses.

I don't really know what fixproto does, but I'm guessing the "right" answer is (a) or (c).

Thoughts/comments/suggestions?

Paul

• Follow-Ups:
  • Re: [RFC] fixproto and canadian cross builds
    * From: Mark Mitchell