From patchwork Fri Apr 13 05:06:09 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 133340 Delivered-To: patch@linaro.org Received: by 10.46.84.18 with SMTP id i18csp348341ljb; Thu, 12 Apr 2018 22:14:50 -0700 (PDT) X-Google-Smtp-Source: AIpwx48CNxaLXiQVXghhxkljy5JCE/9odSl2/4SWpPv/d3VCQ8S7HHjoNf7/ItNY8cSZ+oWWtvI8 X-Received: by 10.101.85.73 with SMTP id t9mr2885248pgr.451.1523596490533; Thu, 12 Apr 2018 22:14:50 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1523596490; cv=none; d=google.com; s=arc-20160816; b=e+fq1GRdvYc/0XyvnXSCppQIp4FNAvsgdITkWzQurMosbWbr9XNf7BibDPx8ErQktk ybE62Wl4VVQKzq+Yu4uuHPKUvLcZoljHzYl11SfqxSn+iD6IDQGNz6otXXYGLzivLqMQ HNaw580p1fnTMtKRIPHhCjeRiBpxIIKy7isLp2QJSWLAaICcRO4+L/lziwrqhSb4uiyu oCqhZVNYvX/9vMxmfGy6yOK1HJn8qCYC9pV6r3iYx60pgS2CifykyfNfgv/CXFVULO0e GiEkPl3my/fW6pO60zrSB0oklEWy54KUSRL6F7PssH1YLr9meW80oHQjKW+WDkQChy1y hwZg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:subject:cc:to:from :dkim-signature:dkim-filter:arc-authentication-results; bh=5AUfESUV/9X0cni3FKOf4g+uGLkxFHuta/hrLB30ezY=; b=WkaFGzU0mH2KGcT7uMTcFqyOpkLGlezYISokTW4Pq4P8/H3H5qt6vVFaNuH7N5qC1D N8EW/NvBHGM8MIY/8pZcv66XWXHhhZYTpJf4CIjEbSMAWnAaJ1bAhfIN2GXEHDeCiAwv 1D/6b1R8iC/sFN9I+GR2PHgaELORn92P7Qot/Odzjt1IhRQHmhqmHF6m35Sg2XZgxw4H E2+G/hlv7MCWa0vxUaNvNUwgzLx2PZ3jDJboOf8LVcjbCabbfQn9BY03zTSHdkjMxBeD 9Rp+48ONGyCAtRvPoo09H80cgVF88FsdsLvcdbkKl/o9Xm5u5OYTXAEKLjRdJnqBfTbw JL5w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@nifty.com header.s=dec2015msa header.b=r4CNVS0/; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a64si3285839pgc.265.2018.04.12.22.14.50; Thu, 12 Apr 2018 22:14:50 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@nifty.com header.s=dec2015msa header.b=r4CNVS0/; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753922AbeDMFOq (ORCPT + 29 others); Fri, 13 Apr 2018 01:14:46 -0400 Received: from conuserg-07.nifty.com ([210.131.2.74]:54463 "EHLO conuserg-07.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751013AbeDMFIP (ORCPT ); Fri, 13 Apr 2018 01:08:15 -0400 Received: from pug.e01.socionext.com (p14092-ipngnfx01kyoto.kyoto.ocn.ne.jp [153.142.97.92]) (authenticated) by conuserg-07.nifty.com with ESMTP id w3D56lfs029209; Fri, 13 Apr 2018 14:06:47 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-07.nifty.com w3D56lfs029209 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.com; s=dec2015msa; t=1523596008; bh=5AUfESUV/9X0cni3FKOf4g+uGLkxFHuta/hrLB30ezY=; h=From:To:Cc:Subject:Date:From; b=r4CNVS0/CHacEhpywbdxyMGXxgpmXAGl9sZqVdKTUEuowlttgQQgRHNKrJ05z7rFD Ako5UzQMyjkOCW8RyRzm8pmiw3ruxQDuGo8gqzQOQeZGk4W/9DJzWjejwBxTpBOZXY 1O+QJlyHimGvZ3MVxaa88vzWtkQYC05yr4itLuMbgmDAnuw4sHVWz/dkD3LbGknmrM HDOvCcqhawtiKh5CHDj4s4LaH6TEwascNhCIweNsh2wEnDqRTP5vaJxv/yiicwbW8c AqBtiRRq2B+POmAOYS63ShZF6uxh4bfJcLIx3uEe4NMsB+iIQuiu4GM3aV+5ciaU8e ACPJJxg9inFyw== X-Nifty-SrcIP: [153.142.97.92] From: Masahiro Yamada To: linux-kbuild@vger.kernel.org Cc: Linus Torvalds , Sam Ravnborg , Ulf Magnusson , Nicholas Piggin , Kees Cook , Emese Revfy , x86@kernel.org, Masahiro Yamada , linux-kernel@vger.kernel.org Subject: [PATCH 00/30] kconfig: move compiler capability tests to Kconfig Date: Fri, 13 Apr 2018 14:06:09 +0900 Message-Id: <1523595999-27433-1-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [Introduction] The motivation of this work is to move the compiler option tests to Kconfig from Makefile. A number of kernel features require the compiler support. Enabling such features blindly in Kconfig ends up with a lot of nasty build-time testing in Makefiles. If a chosen feature turns out unsupported by the compiler, what the build system can do is either to disable it (silently!) or to forcibly break the build, despite Kconfig has let the user to enable it. [Major Changes in V3] This version looks more like Make. - Use = operator instead of 'macro' keyword to define a user-defined function. - 'Recursively expanded variable' is implemented as a side-effect. A variable is a function with zero argument. - Support simply expanded variable which is defined by := operator - Support += operator. Probably, this feature will be useful to accumulate compiler flags. At least, Clang needs some prerequisite flags such as triplet to test other compiler flags. - Support $(info ...) and $(warning ...) built-in functions, which were useful while I was debugging this. - Add documentation - Add unit tests - Collect helpers to scripts/Kconfig.include [TODO items] I have not been able to finish this. Maybe aiming for v4.18-rc1. - The text expansion should be able to defer argument expansion. This is necessary if we want to implement $(if ...) built-in function. - Error out recursive expansion of itself. For example, X = $(X) refers itself. If referenced, the expansion continues eternally. This must be terminated. - More compatible behavior? Kconfig works mostly like Make, but there are naive cases where the behavior is different. [Old Versions] V2: https://lkml.org/lkml/2018/2/16/610 V1: https://lkml.org/lkml/2018/2/16/610 RFC: https://lkml.org/lkml/2018/2/8/429 Masahiro Yamada (30): gcc-plugins: fix build condition of SANCOV plugin kbuild: remove kbuild cache kbuild: remove CONFIG_CROSS_COMPILE support kconfig: reference environment variables directly and remove 'option env=' kconfig: remove string expansion in file_lookup() kconfig: remove string expansion for mainmenu after yyparse() kconfig: remove sym_expand_string_value() kconfig: add built-in function support kconfig: add 'shell' built-in function kconfig: replace $(UNAME_RELEASE) with function call kconfig: begin PARAM state only when seeing a command keyword kconfig: support variable and user-defined function kconfig: support simply expanded variable kconfig: support append assignment operator kconfig: expand lefthand side of assignment statement kconfig: add 'info' and 'warning' built-in functions Documentation: kconfig: document a new Kconfig macro language kconfig: test: test text expansion kconfig: show compiler version text in the top comment kconfig: add basic helper macros to scripts/Kconfig.include stack-protector: test compiler capability in Kconfig and drop AUTO mode kconfig: add CC_IS_GCC and GCC_VERSION kconfig: add CC_IS_CLANG and CLANG_VERSION gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT kcov: test compiler capability in Kconfig and correct dependency gcc-plugins: move GCC version check for PowerPC to Kconfig gcc-plugins: test plugin support in Kconfig and clean up Makefile gcc-plugins: allow to enable GCC_PLUGINS for COMPILE_TEST arm64: move GCC version check for ARCH_SUPPORTS_INT128 to Kconfig kbuild: test dead code/data elimination support in Kconfig Documentation/kbuild/kconfig-language.txt | 8 - Documentation/kbuild/kconfig-macro-language.txt | 179 +++++++ Kconfig | 10 +- MAINTAINERS | 3 +- Makefile | 113 +--- arch/Kconfig | 53 +- arch/arm64/Kconfig | 1 + arch/arm64/Makefile | 2 - arch/powerpc/Kconfig | 2 +- arch/sh/Kconfig | 4 +- arch/sparc/Kconfig | 4 +- arch/um/Kconfig.common | 4 - arch/x86/Kconfig | 15 +- arch/x86/um/Kconfig | 6 +- init/Kconfig | 40 +- kernel/gcov/Kconfig | 17 +- kernel/gcov/Makefile | 2 - lib/Kconfig.debug | 11 +- scripts/Kbuild.include | 101 +--- scripts/Kconfig.include | 20 + scripts/Makefile.gcc-plugins | 91 +--- scripts/Makefile.kcov | 10 +- scripts/clang-version.sh | 18 +- scripts/gcc-plugins/Makefile | 1 + scripts/gcc-x86_32-has-stack-protector.sh | 7 +- scripts/gcc-x86_64-has-stack-protector.sh | 5 - scripts/kconfig/confdata.c | 31 +- scripts/kconfig/kconf_id.c | 1 - scripts/kconfig/lkc.h | 4 - scripts/kconfig/lkc_proto.h | 15 +- scripts/kconfig/menu.c | 3 - scripts/kconfig/preprocess.c | 594 +++++++++++++++++++++ scripts/kconfig/symbol.c | 109 ---- .../kconfig/tests/preprocess/builtin_func/Kconfig | 19 + .../tests/preprocess/builtin_func/__init__.py | 8 + .../tests/preprocess/builtin_func/expected_stderr | 4 + .../tests/preprocess/builtin_func/expected_stdout | 1 + scripts/kconfig/tests/preprocess/escape/Kconfig | 49 ++ .../kconfig/tests/preprocess/escape/__init__.py | 9 + .../tests/preprocess/escape/expected_stderr | 10 + scripts/kconfig/tests/preprocess/user_func/Kconfig | 19 + .../kconfig/tests/preprocess/user_func/__init__.py | 7 + .../tests/preprocess/user_func/expected_stderr | 5 + scripts/kconfig/tests/preprocess/variable/Kconfig | 39 ++ .../kconfig/tests/preprocess/variable/__init__.py | 7 + .../tests/preprocess/variable/expected_stderr | 7 + scripts/kconfig/util.c | 22 +- scripts/kconfig/zconf.l | 95 +++- scripts/kconfig/zconf.y | 48 +- 49 files changed, 1259 insertions(+), 574 deletions(-) create mode 100644 Documentation/kbuild/kconfig-macro-language.txt create mode 100644 scripts/Kconfig.include create mode 100644 scripts/kconfig/preprocess.c create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/Kconfig create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/__init__.py create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/expected_stderr create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/expected_stdout create mode 100644 scripts/kconfig/tests/preprocess/escape/Kconfig create mode 100644 scripts/kconfig/tests/preprocess/escape/__init__.py create mode 100644 scripts/kconfig/tests/preprocess/escape/expected_stderr create mode 100644 scripts/kconfig/tests/preprocess/user_func/Kconfig create mode 100644 scripts/kconfig/tests/preprocess/user_func/__init__.py create mode 100644 scripts/kconfig/tests/preprocess/user_func/expected_stderr create mode 100644 scripts/kconfig/tests/preprocess/variable/Kconfig create mode 100644 scripts/kconfig/tests/preprocess/variable/__init__.py create mode 100644 scripts/kconfig/tests/preprocess/variable/expected_stderr -- 2.7.4