linux-kernel - [PATCH] um: Don't build arch/x86/um/user-offsets.s with gcc plugins

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Date:   Wed, 17 May 2017 22:41:52 +0200
From:   Thomas Meyer <thomas@...3r.de>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        user-mode-linux-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH] um: Don't build arch/x86/um/user-offsets.s with gcc plugins

For some reasons I don't know users-offsets.s get's build before the
gcc-plugins itself.
This patch fixes the problem by not using the gcc-plugins for building
user-offsets.s

make order example:
$ make ARCH=um
  CHK     include/generated/uapi/linux/version.h
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/basic/bin2c
  HOSTCC  scripts/unifdef
  CC      arch/x86/um/user-offsets.s
  CHK     include/generated/user_constants.h
  CHK     include/config/kernel.release
  CHK     include/generated/utsrelease.h
  HOSTCXX -fPIC scripts/gcc-plugins/latent_entropy_plugin.o
  HOSTLLD -shared scripts/gcc-plugins/latent_entropy_plugin.so
  HOSTCXX -fPIC scripts/gcc-plugins/structleak_plugin.o
  HOSTLLD -shared scripts/gcc-plugins/structleak_plugin.so

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---
 arch/x86/um/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index 46cbbfe..d67c78a 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -36,7 +36,7 @@ subarch-$(CONFIG_MODULES) += ../kernel/module.o
 USER_OBJS := bugs_$(BITS).o ptrace_user.o fault.o
 
 extra-y += user-offsets.s
-$(obj)/user-offsets.s: c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) \
+$(obj)/user-offsets.s: c_flags = -Wp,-MD,$(depfile) $(filter-out $(GCC_PLUGINS_CFLAGS), $(USER_CFLAGS) ) \
 	-Iarch/x86/include/generated
 
 UNPROFILE_OBJS := stub_segv.o