diff options
author | Borislav Petkov <bp@suse.de> | 2016-11-14 19:41:31 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-26 09:54:52 +0100 |
commit | 147117cf23c0ba452f80409aec9c0be978232698 (patch) | |
tree | 3debe781c316c3b5a972767f13b2fc1e4a608bfa /fs/ext4 | |
parent | e543f094a38ad006454e9bc54ebc6b94702f11a2 (diff) |
kbuild: Steal gcc's pie from the very beginning
commit c6a385539175ebc603da53aafb7753d39089f32e upstream.
So Sebastian turned off the PIE for kernel builds but that was too late
- Kbuild.include already uses KBUILD_CFLAGS and trying to disable gcc
options with, say cc-disable-warning, fails:
gcc -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs
...
-Wno-sign-compare -fno-asynchronous-unwind-tables -Wframe-address -c -x c /dev/null -o .31392.tmp
/dev/null:1:0: error: code model kernel does not support PIC mode
because that returns an error and we can't disable the warning. For
example in this case:
KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
which leads to gcc issuing all those warnings again.
So let's turn off PIE/PIC at the earliest possible moment, when we
declare KBUILD_CFLAGS so that cc-disable-warning picks it up too.
Also, we need the $(call cc-option ...) because -fno-PIE is supported
since gcc v3.4 and our lowest supported gcc version is 3.2 right now.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Michal Marek <mmarek@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4')
0 files changed, 0 insertions, 0 deletions