Messages in this thread Patch in this message | | | From | "Valdis Klētnieks" <> | Subject | [PATCH v2] gcc-plugins: fix gcc 11 indigestion with plugins... | Date | Tue, 12 Jan 2021 20:19:16 -0500 |
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Fedora Rawhide has started including gcc 11,and the g++ compiler throws a wobbly when it hits scripts/gcc-plugins:
HOSTCXX scripts/gcc-plugins/latent_entropy_plugin.so In file included from /usr/include/c++/11/type_traits:35, from /usr/lib/gcc/x86_64-redhat-linux/11/plugin/include/system.h:244, from /usr/lib/gcc/x86_64-redhat-linux/11/plugin/include/gcc-plugin.h:28, from scripts/gcc-plugins/gcc-common.h:7, from scripts/gcc-plugins/latent_entropy_plugin.c:78: /usr/include/c++/11/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options. 32 | #error This file requires compiler and library support \
Patch is more complicated than would otherwise be needed, because older gcc (4.9, 5.4) have gnu++11 but throw an error due to a gcc bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69959
Signed-off-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> --- diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile index d66949bfeba4..cc779973724a 100644 --- a/scripts/gcc-plugins/Makefile +++ b/scripts/gcc-plugins/Makefile @@ -21,10 +21,13 @@ 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++98 \ + -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-c++11-compat \ + -ggdb -Wno-narrowing -Wno-unused-variable \ -Wno-format-diag plugin_ldflags = -shared
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