diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0552-kbuild-Steal-gcc-s-pie-from-the-very-beginning.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0552-kbuild-Steal-gcc-s-pie-from-the-very-beginning.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0552-kbuild-Steal-gcc-s-pie-from-the-very-beginning.patch b/target/linux/brcm2708/patches-4.4/0552-kbuild-Steal-gcc-s-pie-from-the-very-beginning.patch new file mode 100644 index 0000000000..36aafe8e19 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0552-kbuild-Steal-gcc-s-pie-from-the-very-beginning.patch @@ -0,0 +1,49 @@ +From 8bb4bc0ec8fac19cc635e16d2e5a63dee2cd7f7b Mon Sep 17 00:00:00 2001 +From: Borislav Petkov <bp@suse.de> +Date: Mon, 14 Nov 2016 19:41:31 +0100 +Subject: [PATCH] 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 $(call cc-option ...) because -fno-PIE is supported +since gcc v3.4 and our lowest supported gcc version is 3.2 right now. + +Signed-off-by: Borislav Petkov <bp@suse.de> +Cc: Ben Hutchings <ben@decadent.org.uk> +Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Signed-off-by: Michal Marek <mmarek@suse.com> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + Makefile | 2 -- + 1 file changed, 2 deletions(-) + +--- a/Makefile ++++ b/Makefile +@@ -619,8 +619,6 @@ include arch/$(SRCARCH)/Makefile + KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,) + KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,) + KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,) +-KBUILD_CFLAGS += $(call cc-option,-fno-PIE) +-KBUILD_AFLAGS += $(call cc-option,-fno-PIE) + + ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE + KBUILD_CFLAGS += -Os $(EXTRA_OPTIMIZATION) |