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Message-ID: <104383.1610566503@turing-police> Date: Wed, 13 Jan 2021 14:35:03 -0500 From: "Valdis Klētnieks" <valdis.kletnieks@...edu> To: Kees Cook <keescook@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Geert Uytterhoeven <geert@...ux-m68k.org> cc: linux-hardening@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: [PATCH] gcc-plugins: avoid errors with -std=gnu++11 on old gcc It turns out that older gcc (4.9 and 5.4) have gnu++11 support, but due to a gcc bug fixed in gcc6, throw errors during the build. The relevant gcc bug is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69959 Version the option based on what gcc we're using. Signed-off-by: Valdis Kletnieks <valdis.kletnieks@...edu> Fixes: 27c287b41659 ("gcc-plugins: fix gcc 11 indigestion with plugins...") --- diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile index b5487cce69e8..cc779973724a 100644 --- a/scripts/gcc-plugins/Makefile +++ b/scripts/gcc-plugins/Makefile @@ -21,8 +21,11 @@ always-y += $(GCC_PLUGIN) GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin) +# need gnu++11 for gcc 11, but 4.9 and 5.4 need gnu++98 +GCC_FLAVOR = $(call cc-ifversion, -ge, 1100, 11, 98) + plugin_cxxflags = -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \ - -I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++11 \ + -I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++$(GCC_FLAVOR) \ -fno-rtti -fno-exceptions -fasynchronous-unwind-tables \ -ggdb -Wno-narrowing -Wno-unused-variable \ -Wno-format-diag
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