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xen-devel
Re: [Xen-devel] [PATCH] xen: Deal with stdarg.h and -nostdinc
On 05/27/11 15:13, Keir Fraser wrote:
On 27/05/2011 10:48, "Christoph Egger"<Christoph.Egger@xxxxxxx> wrote:
Finally, rather than referencing a hardcoded /usr/include path or including
gcc intrinsics in xen/stdarg.h, would *BSD prefer a -isystem command-line
option to include the gcc headers in the search path? Then we could perhaps
even get rid of xen/stdarg.h completely.
NetBSD is about to add clang/llvm support. If -isystem works for both
gcc and clang then this should be fine.
Something like the attached patch? I don't know whether this would work for
clang too -- cc'ing Tim who will know or can try it out.
I wouldn't backport this one to 4.1, but my first patch was a cleanup plus
BSD-specific changes, so a variant on that would be suitable for 4.0/4.1,
with (if it works) this new one in unstable.
$ clang -print-file-name=include
include
$ gcc -print-file-name=include
include
$ gcc -print-file-name=a
a
$
I got two variants working:
a) use -nostdinc and map the stdarg usage to the gcc builtins
b) do not use -nostdinc on NetBSD
Both 0?-stdarg-fixes work with a minor
modification to match case a) or case b).
Christoph
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