Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941181AbcKNXJC (ORCPT ); Mon, 14 Nov 2016 18:09:02 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35118 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934108AbcKNXJA (ORCPT ); Mon, 14 Nov 2016 18:09:00 -0500 From: Al Stone To: linux-acpi@vger.kernel.org, devel@acpica.org, linux-kernel@vger.kernel.org Cc: Al Stone , "Rafael J . Wysocki" , Len Brown , Robert Moore , Lv Zheng Subject: [PATCH] ACPI: allow compilation with bare metal compilers Date: Mon, 14 Nov 2016 16:08:46 -0700 Message-Id: <1479164926-1733-1-git-send-email-ahs3@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Mon, 14 Nov 2016 23:09:00 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2268 Lines: 58 The ACPICA subsystem of the ACPI driver sets up a compilation environment for itself, adding in multiple typedefs unique to ACPICA that depend on where ACPICA will be used. The vast majority of such environments (Linux, QNX, ...) have an environment defined by the acenv.h header file. When using a Linaro compiler [1] specifically built to be used in an embedded environment with perhaps a kernel and an init process as the only things running, there is no environment defined for ACPICA so the typedefs it needs are not set up, causing compilation to fail badly unless ACPI is completely disabled. Since ACPI is enabled in the default config for the kernel, the compilation failure is fairly obvious. This may not be the optimal solution, but add in to the ACPI header file include/acpi/platform/acenv.h a default so that if GCC is being used, and all else fails, assume that we are going to be in a Linux-like environment and re-use the environment definition for Linux. This allows us to build a kernel using this compiler [1] with or without ACPI. [1] https://releases.linaro.org/components/toolchain/binaries/latest/aarch64-elff/gcc-linaro-6.1.1-2016-08-x86_64_aarch64-elf.tar.xz Signed-off-by: Al Stone Cc: Rafael J. Wysocki Cc: Len Brown Cc: Robert Moore Cc: Lv Zheng --- include/acpi/platform/acenv.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/acpi/platform/acenv.h b/include/acpi/platform/acenv.h index 34cce72..cdd1cd6 100644 --- a/include/acpi/platform/acenv.h +++ b/include/acpi/platform/acenv.h @@ -234,6 +234,21 @@ #elif defined(_AED_EFI) || defined(_GNU_EFI) || defined(_EDK2_EFI) #include "acefi.h" +/* + * Up to this point, we've been looking for specific environments. In + * some cases, there is no environment, and we're just working on bare + * metal. However, since we're compiling the Linux kernel, let's just + * pretend we're in a Linux environment. + */ +#elif defined(__GNUC__) && !defined(__INTEL_COMPILER) +#if !defined(_LINUX) +#define _LINUX +#endif +#if !defined(__linux__) +#define __linux__ +#endif +#include + #else /* Unknown environment */ -- 2.10.2