From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2B2FE72 for ; Tue, 7 Sep 2021 14:55:55 +0000 (UTC) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 187Eqm0Y009137; Tue, 7 Sep 2021 09:52:48 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 187EqlAQ009134; Tue, 7 Sep 2021 09:52:47 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Tue, 7 Sep 2021 09:52:47 -0500 From: Segher Boessenkool To: Jakub Jelinek Cc: Linus Torvalds , Florian Weimer , Nathan Chancellor , Masahiro Yamada , Nick Desaulniers , Linux Kbuild mailing list , Linux Kernel Mailing List , clang-built-linux , llvm@lists.linux.dev, linux-toolchains@vger.kernel.org Subject: Re: [GIT PULL v2] Kbuild updates for v5.15-rc1 Message-ID: <20210907145247.GH1583@gate.crashing.org> References: <20210906154642.GV1583@gate.crashing.org> <20210906172701.GX1583@gate.crashing.org> <87lf49wodu.fsf@oldenburg.str.redhat.com> <20210906194808.GY1583@gate.crashing.org> <20210906201432.GZ920497@tucnak> <20210906215218.GA920497@tucnak> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210906215218.GA920497@tucnak> User-Agent: Mutt/1.4.2.3i 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, 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 still problematic? And ? Segher