[Buildroot] [PATCH 2/5 v2] toolchain: set the ssp gcc option in kconfig

[Arnout Vandecappelle <arnout@mind.be>]

On 12/03/2019 13:09, yann.morin at orange.com wrote:
> From: "Yann E. MORIN" <yann.morin@orange.com>
> 
> Currently, we repeat all the SSP level selection deep down to the
> toolchain wrapper itself, where we eventually translate it to the
> actual SSP option to use. This is a bit redundant.
> 
> Additionally, we will want to check that the toolchain actually
> supports that option (for those toolchain where it was backported).
> 
> So, move the translation into kconfig, and add the qstrip'ed value
> to the additional flags passed to the wrapper. Add it before
> user-supplied opitons, to keep the previous behaviour (and allow
> anyone crazy-enough to override it with BR2_TARGET_OPTIMIZATION).
> 
> Signed-off-by: "Yann E. MORIN" <yann.morin@orange.com>
> Cc: Matt Weber <matthew.weber@rockwellcollins.com>
> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
> Cc: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>

 Applied to master, thanks.

 Regards,
 Arnout

> 
> ---
> Changes v1 -> v2:
>   - use TOOLCHAIN_WRAPPER_OPTS  (Arnout)
> ---
>  Config.in                      | 6 ++++++
>  toolchain/toolchain-wrapper.c  | 9 ---------
>  toolchain/toolchain-wrapper.mk | 9 +--------
>  3 files changed, 7 insertions(+), 17 deletions(-)
> 
> diff --git a/Config.in b/Config.in
> index d58d8dc04a..757ad1ca40 100644
> --- a/Config.in
> +++ b/Config.in
> @@ -764,6 +764,12 @@ config BR2_SSP_ALL
>  
>  endchoice
>  
> +config BR2_SSP_OPTION
> +	string
> +	default "-fstack-protector"        if BR2_SSP_REGULAR
> +	default "-fstack-protector-strong" if BR2_SSP_STRONG
> +	default "-fstack-protector-all"    if BR2_SSP_ALL
> +
>  comment "Stack Smashing Protection needs a toolchain w/ SSP"
>  	depends on !BR2_TOOLCHAIN_HAS_SSP
>  
> diff --git a/toolchain/toolchain-wrapper.c b/toolchain/toolchain-wrapper.c
> index e9c5cd9d32..c73a0cc079 100644
> --- a/toolchain/toolchain-wrapper.c
> +++ b/toolchain/toolchain-wrapper.c
> @@ -98,15 +98,6 @@ static char *predef_args[] = {
>  #if defined(BR_MIPS_TARGET_BIG_ENDIAN) || defined(BR_ARC_TARGET_BIG_ENDIAN)
>  	"-EB",
>  #endif
> -#ifdef BR_SSP_REGULAR
> -	"-fstack-protector",
> -#endif
> -#ifdef BR_SSP_STRONG
> -	"-fstack-protector-strong",
> -#endif
> -#ifdef BR_SSP_ALL
> -	"-fstack-protector-all",
> -#endif
>  #ifdef BR_ADDITIONAL_CFLAGS
>  	BR_ADDITIONAL_CFLAGS
>  #endif
> diff --git a/toolchain/toolchain-wrapper.mk b/toolchain/toolchain-wrapper.mk
> index c9e6fd3f3d..ca66fa7ba4 100644
> --- a/toolchain/toolchain-wrapper.mk
> +++ b/toolchain/toolchain-wrapper.mk
> @@ -17,6 +17,7 @@ TOOLCHAIN_WRAPPER_ARGS = $($(PKG)_TOOLCHAIN_WRAPPER_ARGS)
>  TOOLCHAIN_WRAPPER_ARGS += -DBR_SYSROOT='"$(STAGING_SUBDIR)"'
>  
>  TOOLCHAIN_WRAPPER_OPTS = \
> +	$(call qstrip,$(BR2_SSP_OPTION)) \
>  	$(call qstrip,$(BR2_TARGET_OPTIMIZATION))
>  
>  # We create a list like '"-mfoo", "-mbar", "-mbarfoo"' so that each flag is a
> @@ -53,14 +54,6 @@ else ifeq ($(BR2_RELRO_FULL),y)
>  TOOLCHAIN_WRAPPER_ARGS += -DBR2_RELRO_FULL
>  endif
>  
> -ifeq ($(BR2_SSP_REGULAR),y)
> -TOOLCHAIN_WRAPPER_ARGS += -DBR_SSP_REGULAR
> -else ifeq ($(BR2_SSP_STRONG),y)
> -TOOLCHAIN_WRAPPER_ARGS += -DBR_SSP_STRONG
> -else ifeq ($(BR2_SSP_ALL),y)
> -TOOLCHAIN_WRAPPER_ARGS += -DBR_SSP_ALL
> -endif
> -
>  define TOOLCHAIN_WRAPPER_BUILD
>  	$(HOSTCC) $(HOST_CFLAGS) $(TOOLCHAIN_WRAPPER_ARGS) \
>  		-s -Wl,--hash-style=$(TOOLCHAIN_WRAPPER_HASH_STYLE) \
>