From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753797AbeDMFMJ (ORCPT ); Fri, 13 Apr 2018 01:12:09 -0400 Received: from conuserg-07.nifty.com ([210.131.2.74]:54534 "EHLO conuserg-07.nifty.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751087AbeDMFIR (ORCPT ); Fri, 13 Apr 2018 01:08:17 -0400 DKIM-Filter: OpenDKIM Filter v2.10.3 conuserg-07.nifty.com w3D56lgL029209 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 27/30] gcc-plugins: test plugin support in Kconfig and clean up Makefile Date: Fri, 13 Apr 2018 14:06:36 +0900 Message-Id: <1523595999-27433-28-git-send-email-yamada.masahiro@socionext.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1523595999-27433-1-git-send-email-yamada.masahiro@socionext.com> References: <1523595999-27433-1-git-send-email-yamada.masahiro@socionext.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Run scripts/gcc-plugin.sh from Kconfig so that users can enable GCC_PLUGINS only when the compiler supports building plugins. Kconfig defines a new symbol, PLUGIN_HOSTCC. This will contain the compiler (g++ or gcc) used for building plugins, or empty if the plugin can not be supported at all. This allows us to remove all ugly testing in Makefile.gcc-plugins. Signed-off-by: Masahiro Yamada --- Changes in v3: - Respin to keep scripts/gcc-plugin.sh as-is. Changes in v2: None arch/Kconfig | 10 ++++++ scripts/Kconfig.include | 3 ++ scripts/Makefile.gcc-plugins | 79 ++++++++++++-------------------------------- scripts/gcc-plugins/Makefile | 1 + 4 files changed, 36 insertions(+), 57 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index b0582f2..9166157 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -401,6 +401,15 @@ config SECCOMP_FILTER See Documentation/prctl/seccomp_filter.txt for details. +preferred-plugin-hostcc := $(shell [ $(gcc-version) -ge 40800 ] && echo $(HOSTCXX) || echo $(HOSTCC)) + +config PLUGIN_HOSTCC + string + default "$(shell $(srctree)/scripts/gcc-plugin.sh $(preferred-plugin-hostcc) $(HOSTCXX) $(CC))" + help + Host compiler used to build GCC plugins. This can be $(HOSTCXX), + $(HOSTCC), or a null string if GCC plugin is unsupported. + config HAVE_GCC_PLUGINS bool help @@ -410,6 +419,7 @@ config HAVE_GCC_PLUGINS menuconfig GCC_PLUGINS bool "GCC plugins" depends on HAVE_GCC_PLUGINS + depends on PLUGIN_HOSTCC != "" depends on !COMPILE_TEST help GCC plugins are loadable modules that provide extra features to the diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index cac7a81..0864a19 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -15,3 +15,6 @@ cc-option = $(success $(CC) -Werror $(1) -c -x c /dev/null -o /dev/null) # y if the given linker flag is supported, n otherwise ld-option = $(success $(LD) -v $(1)) + +# gcc version including patch level +gcc-version := $(shell $(srctree)/scripts/gcc-version.sh -p $(CC) | sed 's/^0*//') diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins index 1e92353..da5d38d 100644 --- a/scripts/Makefile.gcc-plugins +++ b/scripts/Makefile.gcc-plugins @@ -1,72 +1,37 @@ # SPDX-License-Identifier: GPL-2.0 -ifdef CONFIG_GCC_PLUGINS - __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC)) - PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)") - - SANCOV_PLUGIN := -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so - - gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so +gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so - gcc-plugin-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += latent_entropy_plugin.so - gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += -DLATENT_ENTROPY_PLUGIN - ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY +gcc-plugin-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += latent_entropy_plugin.so +gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += -DLATENT_ENTROPY_PLUGIN +ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY DISABLE_LATENT_ENTROPY_PLUGIN += -fplugin-arg-latent_entropy_plugin-disable - endif - - ifdef CONFIG_GCC_PLUGIN_SANCOV - # It is needed because of the gcc-plugin.sh and gcc version checks. - gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so - - ifeq ($(PLUGINCC),) - $(warning warning: cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler) - endif - endif - - gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += structleak_plugin.so - gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE) += -fplugin-arg-structleak_plugin-verbose - gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) += -fplugin-arg-structleak_plugin-byref-all - gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += -DSTRUCTLEAK_PLUGIN +endif - gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += randomize_layout_plugin.so - gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += -DRANDSTRUCT_PLUGIN - gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) += -fplugin-arg-randomize_layout_plugin-performance-mode +gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so +gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += structleak_plugin.so +gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE) += -fplugin-arg-structleak_plugin-verbose +gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL) += -fplugin-arg-structleak_plugin-byref-all +gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK) += -DSTRUCTLEAK_PLUGIN - GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y)) +gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += randomize_layout_plugin.so +gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT) += -DRANDSTRUCT_PLUGIN +gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) += -fplugin-arg-randomize_layout_plugin-performance-mode - export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR - export SANCOV_PLUGIN DISABLE_LATENT_ENTROPY_PLUGIN +GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y)) - ifneq ($(PLUGINCC),) - # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication. - GCC_PLUGINS_CFLAGS := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGINS_CFLAGS)) - endif +export GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR +export DISABLE_LATENT_ENTROPY_PLUGIN - KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS) - GCC_PLUGIN := $(gcc-plugin-y) - GCC_PLUGIN_SUBDIR := $(gcc-plugin-subdir-y) -endif +# SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication. +GCC_PLUGINS_CFLAGS := $(filter-out %/sancov_plugin.so, $(GCC_PLUGINS_CFLAGS)) -# If plugins aren't supported, abort the build before hard-to-read compiler -# errors start getting spewed by the main build. -PHONY += gcc-plugins-check -gcc-plugins-check: FORCE -ifdef CONFIG_GCC_PLUGINS - ifeq ($(PLUGINCC),) - ifneq ($(GCC_PLUGINS_CFLAGS),) - ifeq ($(call cc-ifversion, -ge, 0405, y), y) - $(Q)$(srctree)/scripts/gcc-plugin.sh --show-error "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)" || true - @echo "Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?" >&2 && exit 1 - else - @echo "Cannot use CONFIG_GCC_PLUGINS: your gcc version does not support plugins, you should upgrade it to at least gcc 4.5" >&2 && exit 1 - endif - endif - endif -endif - @: +KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS) +GCC_PLUGIN := $(gcc-plugin-y) +GCC_PLUGIN_SUBDIR := $(gcc-plugin-subdir-y) # Actually do the build, if requested. PHONY += gcc-plugins -gcc-plugins: scripts_basic gcc-plugins-check +gcc-plugins: scripts_basic ifdef CONFIG_GCC_PLUGINS $(Q)$(MAKE) $(build)=scripts/gcc-plugins endif diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile index e2ff425..c47198c 100644 --- a/scripts/gcc-plugins/Makefile +++ b/scripts/gcc-plugins/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 +PLUGINCC := $(CONFIG_PLUGIN_HOSTCC:"%"=%) GCC_PLUGINS_DIR := $(shell $(CC) -print-file-name=plugin) ifeq ($(PLUGINCC),$(HOSTCC)) -- 2.7.4