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

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Date:   Fri, 28 Oct 2016 10:09:21 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Shuah Khan <shuahkhan@...il.com>
Cc:     Michal Marek <mmarek@...e.com>, linux-kbuild@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Ben Hutchings <ben@...adent.org.uk>
Subject: Re: [RFC PATCH] kbuild: add -fno-PIE

On 2016-10-27 11:09:06 [-0600], Shuah Khan wrote:
> diff --git a/Makefile b/Makefile
> index 82a36ab..0a01ad1 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -651,6 +651,11 @@ ifneq ($(CONFIG_FRAME_WARN),0)
>  KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
>  endif
> 
> +# force no-pie for distro compilers that enable pie by default
> +KBUILD_CFLAGS += $(call cc-option, -fno-pie)
> +KBUILD_CFLAGS += $(call cc-option, -no-pie)

so why do we need -no-pie? What is different from -fno-pie

> +KBUILD_AFLAGS += $(call cc-option, -fno-pie)

Why do need to pass this to the assembler? Is this for the
fstack-protector?

> 
> thanks,
> -- Shuah

Sebastian