Date: Thu, 19 Jan 2006 14:51:25 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: arch@freebsd.org Subject: Re: The cause of the build problems with ccache Message-ID: <20060119125124.GB52459@ip.net.ua> In-Reply-To: <20060119084827.lsj89qu01wgogogs@netchild.homeip.net> References: <20060119084827.lsj89qu01wgogogs@netchild.homeip.net>
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On Thu, Jan 19, 2006 at 08:48:27AM +0100, Alexander Leidinger wrote:
> Hi,
>=20
> I looked at the cause of the build errors when using ccache. When building
> with ccache, the compiler uses /usr/include instead of the includes in
> /usr/src (after the "unsigned char" -> "void" change in the md5 header th=
is
> jumps directly into your face if you look at the error message).
>=20
> Does the intermediate compiler in /usr/obj get build with a different def=
ault
> include path?
>=20
Yes. The magic is in this line in Makefile.inc1:
XMAKE=3D TOOLS_PREFIX=3D${WORLDTMP} ${BMAKE} -DNO_FORTRAN -DNO_GDB
^^^^^^^^^^^^^^^^^^^^^^^^
> If yes:
> - This would also result in picking up the wrong includes when someone t=
ries
> to build the world with a different compiler (e.g. icc).
>=20
I believe so.
> - Wouldn't it be better to discard the default include path and add the
> include path we want explicitly on the command line?
>=20
This was attempted before and failed. I don't remember all the details
now (you can also go ask Marcel and David), but I remember GCC is picky
about standard paths: it would treat them differently from other
locations, resulting in a different set of warnings etc. And we want
it to work exactly as if these paths were standard. The compiler set
uses stuff in ${WORLDTMP}: new headers, libraries, etc.
Cheers,
--=20
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer
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