Date: Wed, 30 Mar 2011 17:23:32 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: mdf@FreeBSD.org Cc: freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: Include file search path Message-ID: <4D934AF4.9080503@FreeBSD.org> In-Reply-To: <AANLkTi=BiUVnzsGg83wwWPHjnTDR=XukhJ3UK6Bd5hvF@mail.gmail.com> References: <AANLkTi=BiUVnzsGg83wwWPHjnTDR=XukhJ3UK6Bd5hvF@mail.gmail.com>
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On 2011-03-29 23:20, mdf@FreeBSD.org wrote:
> So here's what I'm pondering. When I build a library, like e.g. libc,
> where do the include files get pulled from? They can't (shouldn't) be
> the ones in /usr/include, but I don't see a -nostdinc like for the
> kernel. There are -I directives in the Makefile for
> -I${.CURDIR}/include -I${.CURDIR}/../../include, etc., but that won't
> remove /usr/include from the search path.
During the bootstrap stage, a copy of gcc (or clang) is built, that has
all default search paths for headers, libraries, etc, set relative to
${WORLDTMP}, usually /usr/obj/usr/src/tmp.
E.g:
$ /usr/obj/usr/src/tmp/usr/bin/gcc -v -E -x c /dev/null -o /dev/null
Using built-in specs.
Target: amd64-undermydesk-freebsd
Configured with: FreeBSD/amd64 system compiler
Thread model: posix
gcc version 4.2.1 20070719 [FreeBSD]
/usr/obj/usr/src/tmp/usr/libexec/cc1 -E -quiet -v -D_LONGLONG /dev/null -o /dev/null
#include "..." search starts here:
#include <...> search starts here:
/usr/obj/usr/src/tmp/usr/include/gcc/4.2
/usr/obj/usr/src/tmp/usr/include
End of search list.
and:
$ /usr/obj/usr/src/tmp/usr/bin/gcc -print-search-dirs
install: /usr/obj/usr/src/tmp/usr/libexec/
programs: =/usr/obj/usr/src/tmp/usr/bin/:/usr/obj/usr/src/tmp/usr/bin/:/usr/obj/usr/src/tmp/usr/libexec/:/usr/obj/usr/src/tmp/usr/libexec/:/usr/obj/usr/src/tmp/usr/libexec/
libraries: =/usr/obj/usr/src/tmp/usr/lib/:/usr/obj/usr/src/tmp/usr/lib/
This is a rather nasty hack, though. If we can make it work, we should
probably try using --sysroot instead, or alternatively, -nostdinc and
adding include dirs by hand. The same for executable and library search
paths, although I am not sure if there is a way to completely reset
those with the current options.
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