linux-kernel - Re: [GIT PULL v2] Kbuild updates for v5.15-rc1

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Message-ID: <20210907145247.GH1583@gate.crashing.org>
Date:   Tue, 7 Sep 2021 09:52:47 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Jakub Jelinek <jakub@...hat.com>
Cc:     Linus Torvalds <torvalds@...uxfoundation.org>,
        Florian Weimer <fweimer@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        llvm@...ts.linux.dev, linux-toolchains@...r.kernel.org
Subject: Re: [GIT PULL v2] Kbuild updates for v5.15-rc1

On Mon, Sep 06, 2021 at 11:52:18PM +0200, Jakub Jelinek wrote:
> On Mon, Sep 06, 2021 at 02:08:58PM -0700, Linus Torvalds wrote:
> There is a stddef.h include too and that's it
> (I must say I don't see the reason for that include though).

Yeah me neither.  Maybe the header used NULL before?

> Other compiler provided headers (not talking about C++ now) also have no
> or very limited includes, including stddef.h, stdarg.h, stdatomic.h, etc.
> The only exceptions are tgmath.h which isn't usable without libc
> math.h/complex.h,

<tgmath.h> is only for hosted environments.  That requires a C library
for GCC (we do not implement this stuff ourselves).  The compiler and
the C library have to work together to get this done, and the relation
between GCC and Glibc has been a bit too tight for this, it is true.

But a kernel build is not in a hosted environment.

> in some cases stdint.h and limits.h which are in some
> configurations provided both by the C library and the compiler and include
> each other in that case (but e.g. stdint.h has an alternate version that
> only uses compiler provided builtin macros) and openacc.h.

On what targets is <stdint.h> still problematic?  And <limits.h>?


Segher