[oe] linux-libc-headers-native, gcc-cross issue

[Khem Raj]

On Sun, Jun 20, 2010 at 1:51 PM, Frans Meulenbroeks
<fransmeulenbroeks at gmail.com> wrote:
> Dear all,
>
> After the introduction of linux-libc-headers-native I've bumped into
> the following issue.
> linux-libc-headers-native installs unistd.h in sysroots
> This causes other recipes to pick up the x86 files instead of the target ones.
> I've seen this happen for both unistd.h and sigcontext.h
>
> One of the recipes suffering from this is gcc-cross (for some architectures).
> Reason is that files are compiled with
> -I/home/frans/oe/tmp_angstrom/sysroots/i686-linux/usr/include whereas
> the target specific includes are added with -isystem.
> This causes the -I to win.

right. gcc-cross is a special case where its not building purely cross
binaries but
also making libraries and objects that will run on the target. This
problem probaly
is seen when building startup objects  (crt*.o). This path is added by
gcc build
machinery as a path where it finds gmp headers. I suspect that gcc build should
not be passing this in the incudes when building target stuff.

I think with sysroot using -isystem<target_headers> should not be needed.


>
> In the past sysroots/i686-linux/usr/include was empty, but with
> linux-libc-headers-native it gets populated causing the files in there
> to be used instead of the ones in the target ones.
> By setting linux-libc-headers-native to ASSUME-PROVIDED and cleaning
> and rebuilding TMPDIR I was able to avoid the problem.

yeah this masked the problem as it has been masked till now.

>
> However, I think this needs a more structural solution.
> Suggestions are appreciated.

We should explore if passing this isystem in CFLAGS is needed at all.
if not then we should remove it.

>
> Frans.
>
> PS: it might also be that other files suffer from this, but until now
> I only had problems with gcc-cross

could be but I doubt.

>
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