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Re: [PATCH v2 04/13] compiler.h: remove GCC < 3 __builtin_expect fallbac
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From: |
Peter Maydell |
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Subject: |
Re: [PATCH v2 04/13] compiler.h: remove GCC < 3 __builtin_expect fallback |
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Date: |
Thu, 26 Nov 2020 11:55:22 +0000 |
On Thu, 26 Nov 2020 at 11:29, <marcandre.lureau@redhat.com> wrote:
>
> From: Marc-André Lureau <marcandre.lureau@redhat.com>
>
> Since commit efc6c07 ("configure: Add a test for the minimum compiler
> version"), QEMU explicitely depends on GCC >= 4.8.
>
> (clang >= 3.8 advertizes itself as GCC >= 4.2 compatible)
All clangs always have advertised themselves as gcc-4.2-compatible,
as far as I'm aware. 3.4 is the version we need to care about,
I think it probably supported __builtin_expect(). (A test
of the whole series with gcc 4.8 and clang 3.4 would confirm this.)
thnaks
-- PMM
[PATCH v2 06/13] tests: remove GCC < 4 fallbacks, marcandre . lureau, 2020/11/26
[PATCH v2 07/13] virtiofsd: replace _Static_assert with QEMU_BUILD_BUG_ON, marcandre . lureau, 2020/11/26
[PATCH v2 08/13] compiler.h: explicit case for Clang printf attribute, marcandre . lureau, 2020/11/26