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gcc-plugins: drop -std=gnu++11 to fix GCC 13 build 

[ Upstream commit 5a6b64adc1 ]

The latest GCC 13 snapshot (13.0.1 20230129) gives the following:
```
cc1: error: cannot load plugin ./scripts/gcc-plugins/randomize_layout_plugin.so
 :./scripts/gcc-plugins/randomize_layout_plugin.so: undefined symbol: tree_code_type
```

This ends up being because of https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=b0241ce6e37031
upstream in GCC which changes the visibility of some types used by the kernel's
plugin infrastructure like tree_code_type.

After discussion with the GCC folks, we found that the kernel needs to be building
plugins with the same flags used to build GCC - and GCC defaults to gnu++17
right now. The minimum GCC version needed to build the kernel is GCC 5.1
and GCC 5.1 already defaults to gnu++14 anyway, so just drop the flag, as
all GCCs that could be used to build GCC already default to an acceptable
version which was >= the version we forced via flags until now.

Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108634
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230201230009.2252783-1-sam@gentoo.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sam James 2023-02-01 23:00:09 +00:00 committed by Greg Kroah-Hartman
parent 9427584c2f
commit ad04399765
1 changed files with 1 additions and 1 deletions
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2
scripts/gcc-plugins/Makefile
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@ -29,7 +29,7 @@ GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
plugin_cxxflags = -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \ plugin_cxxflags = -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
-include $(srctree)/include/linux/compiler-version.h \ -include $(srctree)/include/linux/compiler-version.h \
-DPLUGIN_VERSION=$(call stringify,$(KERNELVERSION)) \ -DPLUGIN_VERSION=$(call stringify,$(KERNELVERSION)) \
-I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++11 \ -I $(GCC_PLUGINS_DIR)/include -I $(obj) \
-fno-rtti -fno-exceptions -fasynchronous-unwind-tables \ -fno-rtti -fno-exceptions -fasynchronous-unwind-tables \
-ggdb -Wno-narrowing -Wno-unused-variable \ -ggdb -Wno-narrowing -Wno-unused-variable \
-Wno-format-diag -Wno-format-diag