linux-kernel - [RFC PATCH] kbuild: add -fno-PIE

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Message-Id: <20161021111600.9417-1-bigeasy@linutronix.de>
Date:   Fri, 21 Oct 2016 13:16:00 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Michal Marek <mmarek@...e.com>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben@...adent.org.uk,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [RFC PATCH] kbuild: add -fno-PIE

Debian started to build the gcc with --enable-default-pie by default so the
kernel build ends before it starts properly with:
|kernel/bounds.c:1:0: error: code model kernel does not support PIC mode

Is this okay or do we want some kind of check to see if -fno-PIE is supported?
It is mentioned in the 4.4.7 gcc manpage is it is not *that* new :)

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index bf6e44a421df..97296d66b586 100644
--- a/Makefile
+++ b/Makefile
@@ -398,7 +398,7 @@ KBUILD_CPPFLAGS := -D__KERNEL__
 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
 		   -fno-strict-aliasing -fno-common \
 		   -Werror-implicit-function-declaration \
-		   -Wno-format-security \
+		   -Wno-format-security -fno-PIE \
 		   -std=gnu89
 
 KBUILD_AFLAGS_KERNEL :=
-- 
2.9.3