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toolchain: add hidden BR2_TOOLCHAIN_HAS_SSP_STRONG boolean

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This will allow toolchain to indicate if they support
-fstack-protector-strong or not.

Whenever the gcc version is >= 4.9, we always have SSP_STRONG support
if we have SSP support. However, some toolchains older than gcc 4.9
might have backported SSP_STRONG support, which is why we cannot rely
just on BR2_TOOLCHAIN_GCC_AT_LEAST_4_9.

Having this "default" value allows to avoid adding a "select
BR2_TOOLCHAIN_HAS_SSP_STRONG" in the internal toolchain logic plus in
almost external toolchains. But it allows custom external toolchains
that are pre-4.9 to potentially declare that they support strong SSP.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Thomas Petazzoni 2020-02-20 03:01:14 +01:00 committed by Yann E. MORIN
parent 2bb9b7c56b
commit 2b75114392
1 changed files with 4 additions and 0 deletions
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4
toolchain/Config.in
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@ -189,6 +189,10 @@ config BR2_TOOLCHAIN_HAS_THREADS_NPTL
config BR2_TOOLCHAIN_HAS_SSP
bool
config BR2_TOOLCHAIN_HAS_SSP_STRONG
bool
default y if BR2_TOOLCHAIN_HAS_SSP && BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
config BR2_TOOLCHAIN_HAS_UCONTEXT
bool