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gcc-plugins: make it possible to disable CONFIG_GCC_PLUGINS again

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I noticed that randconfig builds with gcc no longer produce a lot of
ccache hits, unlike with clang, and traced this back to plugins
now being enabled unconditionally if they are supported.

I am now working around this by adding

   export CCACHE_COMPILERCHECK=/usr/bin/size -A %compiler%

to my top-level Makefile. This changes the heuristic that ccache uses
to determine whether the plugins are the same after a 'make clean'.

However, it also seems that being able to just turn off the plugins is
generally useful, at least for build testing it adds noticeable overhead
but does not find a lot of bugs additional bugs, and may be easier for
ccache users than my workaround.

Fixes: 9f671e5815 ("security: Create "kernel hardening" config area")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20191211133951.401933-1-arnd@arndb.de
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Arnd Bergmann 2019-12-11 14:39:28 +01:00 committed by Kees Cook
parent fd6988496e
commit a5b0dc5a46
1 changed files with 4 additions and 5 deletions
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9
scripts/gcc-plugins/Kconfig
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@ -14,8 +14,8 @@ config HAVE_GCC_PLUGINS
An arch should select this symbol if it supports building with
GCC plugins.
config GCC_PLUGINS
bool
menuconfig GCC_PLUGINS
bool "GCC plugins"
depends on HAVE_GCC_PLUGINS
depends on PLUGIN_HOSTCC != ""
default y
@ -25,8 +25,7 @@ config GCC_PLUGINS
See Documentation/core-api/gcc-plugins.rst for details.
menu "GCC plugins"
depends on GCC_PLUGINS
if GCC_PLUGINS
config GCC_PLUGIN_CYC_COMPLEXITY
bool "Compute the cyclomatic complexity of a function" if EXPERT
@ -113,4 +112,4 @@ config GCC_PLUGIN_ARM_SSP_PER_TASK
bool
depends on GCC_PLUGINS && ARM
endmenu
endif