From patchwork Fri Mar 13 09:05:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Daniel Kachhap X-Patchwork-Id: 11436333 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 88530921 for ; Fri, 13 Mar 2020 09:06:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65F102074B for ; Fri, 13 Mar 2020 09:06:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726365AbgCMJGa (ORCPT ); Fri, 13 Mar 2020 05:06:30 -0400 Received: from foss.arm.com ([217.140.110.172]:50006 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726310AbgCMJGa (ORCPT ); Fri, 13 Mar 2020 05:06:30 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8FAC4FEC; Fri, 13 Mar 2020 02:06:29 -0700 (PDT) Received: from a075553-lin.blr.arm.com (a075553-lin.blr.arm.com [10.162.17.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 201993F67D; Fri, 13 Mar 2020 02:06:24 -0700 (PDT) From: Amit Daniel Kachhap To: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland , Kees Cook , Ard Biesheuvel , Catalin Marinas , Suzuki K Poulose , Will Deacon , Ramana Radhakrishnan , Kristina Martsenko , Dave Martin , Amit Daniel Kachhap , James Morse , Vincenzo Frascino , Mark Brown , Vincenzo Frascino , Masahiro Yamada , linux-kbuild@vger.kernel.org Subject: [PATCH v7 15/17] kconfig: Add support for 'as-option' Date: Fri, 13 Mar 2020 14:35:02 +0530 Message-Id: <1584090304-18043-16-git-send-email-amit.kachhap@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1584090304-18043-1-git-send-email-amit.kachhap@arm.com> References: <1584090304-18043-1-git-send-email-amit.kachhap@arm.com> Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org From: Vincenzo Frascino Currently kconfig does not have a feature that allows to detect if the used assembler supports a specific compilation option. Introduce 'as-option' to serve this purpose in the context of Kconfig: config X def_bool $(as-option,...) Cc: Masahiro Yamada Cc: linux-kbuild@vger.kernel.org Acked-by: Masahiro Yamada Signed-off-by: Vincenzo Frascino Signed-off-by: Amit Daniel Kachhap --- scripts/Kconfig.include | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index 85334dc..a1c1925 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -31,6 +31,12 @@ cc-option = $(success,$(CC) -Werror $(CLANG_FLAGS) $(1) -S -x c /dev/null -o /de # Return y if the linker supports , n otherwise ld-option = $(success,$(LD) -v $(1)) +# $(as-option,) +# /dev/zero is used as output instead of /dev/null as some assembler cribs when +# both input and output are same. Also both of them have same write behaviour so +# can be easily substituted. +as-option = $(success, $(CC) $(CLANG_FLAGS) $(1) -c -x assembler /dev/null -o /dev/zero) + # $(as-instr,) # Return y if the assembler supports , n otherwise as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler -o /dev/null -)