[Buildroot] [PATCH 2/4] toolchain: check the SSP option is known

[yann.morin at orange.com <yann.morin@orange.com>]

Arnout, All,

On 2019-03-12 09:53 +0100, Arnout Vandecappelle spake thusly:
> On 12/03/2019 07:18, yann.morin at orange.com wrote:
> > Arnout, All,
> > 
> > On 2019-03-12 01:25 +0100, Arnout Vandecappelle spake thusly:
> >> On 11/03/2019 07:48, yann.morin at orange.com wrote:
> >>> From: "Yann E. MORIN" <yann.morin@orange.com>
> >>> Extend the macro that currently checks for SSP in the toolchain, with
> >>> a new test that the actual SSP option is recognised and accepted.
> > [--SNIP--]
> >>  I notice that in vlc.mk, we have
> >>
> >> ax_cv_check_cflags___fstack_protector_strong=$(if $(BR2_TOOLCHAIN_HAS_SSP),yes,no)
> > 
> > It should probably be changed to:   $(if $(BR2_SSP_STRONG),yes,no)
> > 
> > I'll check what vlc really wants it for (e.g. strong, all, regular?),
> > fix and send a patch.
> > 
> >> without an actual check that stack-protector=strong really is available... Maybe
> >> we need BR2_TOOLCHAIN_HAS_SSP_STRONG after all?
> > 
> > I really pondered doing it that way, but I decided against, because:
> > 
> >   - our internal toolchain infra only supports gcc >= 4.9, so it has SSP
> >     strong
> > 
> >   - of the external pre-built toolchains, only the codesourcery-arm one
> >     has a gcc-4.8 which lacks SSP strong (and I use that in the cover
> >     letter to explain how to test my changes), all the others have a
> >     gcc >= 4.9
> > 
> > So, we'd have to add this _HAS_SSP_STRONG for a single case.
> 
>  Hm, somehow I missed that in your commit message :-P

ACK, I'll add it to the commit message before submitting v2.

Regards,
Yann E. MORIN.

>  Regards,
>  Arnout
> 
> > 
> > Now, the vlc case, fixed as I suggest above, would be covered by this
> > configure-test.
> > 
> > Regards,
> > Yann E. MORIN.
> > 
> >>> 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>
> >>> ---
> >>>  toolchain/helpers.mk                                   | 8 ++++++++
> >>>  toolchain/toolchain-external/pkg-toolchain-external.mk | 2 +-
> >>>  2 files changed, 9 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk
> >>> index e5520c00c3..ba097e83cf 100644
> >>> --- a/toolchain/helpers.mk
> >>> +++ b/toolchain/helpers.mk
> >>> @@ -415,6 +415,7 @@ check_unusable_toolchain = \
> >>>  # Check if the toolchain has SSP (stack smashing protector) support
> >>>  #
> >>>  # $1: cross-gcc path
> >>> +# $2: gcc ssp option
> >>>  #
> >>>  check_toolchain_ssp = \
> >>>  	__CROSS_CC=$(strip $1) ; \
> >>> @@ -427,6 +428,13 @@ check_toolchain_ssp = \
> >>>  		echo "SSP support not available in this toolchain, please disable BR2_TOOLCHAIN_EXTERNAL_HAS_SSP" ; \
> >>>  		exit 1 ; \
> >>>  	fi ; \
> >>> +	__SSP_OPTION=$(2); \
> >>> +	if [ -n "$${__SSP_OPTION}" ] ; then \
> >>> +		if ! echo 'void main(){}' | $${__CROSS_CC} -Werror $${__SSP_OPTION} -x c - -o $(BUILD_DIR)/.br-toolchain-test.tmp >/dev/null 2>&1 ; then \
> >>> +			echo "SSP option $${__SSP_OPTION} not available in this toolchain, please select another SSP level" ; \
> >>> +			exit 1 ; \
> >>> +		fi; \
> >>> +	fi; \
> >>>  	rm -f $(BUILD_DIR)/.br-toolchain-test.tmp*
> >>>  
> >>>  #
> >>> diff --git a/toolchain/toolchain-external/pkg-toolchain-external.mk b/toolchain/toolchain-external/pkg-toolchain-external.mk
> >>> index db3570d96f..00cbd7b17a 100644
> >>> --- a/toolchain/toolchain-external/pkg-toolchain-external.mk
> >>> +++ b/toolchain/toolchain-external/pkg-toolchain-external.mk
> >>> @@ -549,7 +549,7 @@ define $(2)_CONFIGURE_CMDS
> >>>  	else \
> >>>  		$$(call check_glibc,$$$${SYSROOT_DIR}) ; \
> >>>  	fi
> >>> -	$$(Q)$$(call check_toolchain_ssp,$$(TOOLCHAIN_EXTERNAL_CC))
> >>> +	$$(Q)$$(call check_toolchain_ssp,$$(TOOLCHAIN_EXTERNAL_CC),$(BR2_SSP_OPTION))
> >>>  endef
> >>>  
> >>>  $(2)_TOOLCHAIN_WRAPPER_ARGS += $$(TOOLCHAIN_EXTERNAL_TOOLCHAIN_WRAPPER_ARGS)
> >>>
> > 

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