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Date: Mon, 13 Jun 2016 00:12:44 +0200
From: Emese Revfy <>
To: Paul Gortmaker <>
Cc: Kees Cook <>, Michal Marek <>,
 Stephen Rothwell <>, Sudip Mukherjee
 <>, Linux-Next <>,
 <>, <>
Subject: Re: [PATCH] gcc-plugins: disable under COMPILE_TEST

On Sat, 11 Jun 2016 12:29:26 -0400
Paul Gortmaker <> wrote:

> [[PATCH] gcc-plugins: disable under COMPILE_TEST] On 11/06/2016 (Sat 09:12) Kees Cook wrote:
> > Since adding the gcc plugin development headers is required for the
> > gcc plugin support, we should ease into this new kernel build dependency
> > more slowly. For now, disable the gcc plugins under COMPILE_TEST so that
> > all*config builds will skip it.
> Wouldn't it be better to test compile a one line program that tries to
> source the header(s) and then react accordingly?

The scripts/ script does exactly that.
> Then at least you would get the test coverage from people who have the
> headers installed who are doing all[yes|mod]config.  This "for now"
> solution doesn't really have a path forward other than assuming all
> distros install the plugin headers sometime in the future.
> Either way, this is an improvement over the current situation, so thanks
> for that.

If it is not too late I think this patch would be better:

When there is no gcc plugin support then don't compile the plugins
(but still print a warning). This allows building allyes/allmod configs
until the gcc plugin headers get installed.
Signed-off-by: Emese Revfy <>
 Makefile                     | 6 +++---
 scripts/Makefile.gcc-plugins | 8 ++++----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/Makefile b/Makefile
index a49c075..715210c 100644
--- a/Makefile
+++ b/Makefile
@@ -623,15 +623,15 @@ endif
 # Tell gcc to never replace conditional load with a non-conditional one
 KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
+include scripts/Makefile.gcc-plugins
 PHONY += gcc-plugins
 gcc-plugins: scripts_basic
 	$(Q)$(MAKE) $(build)=scripts/gcc-plugins
-include scripts/Makefile.gcc-plugins
 # Disable optimizations that make assembler listings hard to read.
 # reorder blocks reorders the control in the function
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index c7372cb..2f101ea 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -21,6 +21,7 @@ ifdef CONFIG_GCC_PLUGINS
         $(warning warning: cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler)
+        CFLAGS_KCOV =
@@ -37,13 +38,12 @@ ifdef CONFIG_GCC_PLUGINS
         $(warning warning: your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
-  else
-    # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
+  # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
   GCC_PLUGIN := $(gcc-plugin-y)


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