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toolchain/toolchain-external/toolchain-external-custom: be more flexible on gcc version

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The custom external toolchain logic asks the user to specify which gcc
version is provided by the toolchain. The list of gcc versions given
by Buildroot is restricted depending on the selected CPU architecture
using the BR2_ARCH_NEEDS_GCC_AT_LEAST_xyz config options.

However, these config options generally indicate in which upstream gcc
version the support for the selected architecture was introduced. But
in practice, it is possible that an external toolchain uses some
non-upstream gcc code, providing support for a CPU architecture before
it was merged in upstream gcc.

A specific example is that there are pre-built external toolchains for
the C-SKY CPU architecture that are based on gcc 6.x, even if the
support for it was only added in upstream gcc 9.x.

Due to the BR2_ARCH_NEEDS_GCC_AT_LEAST_xyz options, only gcc >= 9.x
can be selected for C-SKY, preventing the use of such a custom
toolchain.

In addition, those dependencies are in fact not really needed:
Buildroot will check that the gcc version provided matches what the
user declared in the configuration. And if the gcc provided by the
toolchain does support that CPU architecture, then well, so be it,
there's no need to restrict the gcc version selected.

So we simply get rid of these dependencies on
BR2_ARCH_NEEDS_GCC_AT_LEAST_xyz, and also don't use them anymore to
chose a default value for the gcc version.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Acked-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2019-08-02 23:36:46 +02:00 committed by Peter Korsgaard
parent 0273e2053b
commit b3ba26150d
1 changed files with 0 additions and 20 deletions
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20
toolchain/toolchain-external/toolchain-external-custom/Config.in.options
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@ -27,14 +27,6 @@ config BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX
choice
bool "External toolchain gcc version"
default BR2_TOOLCHAIN_EXTERNAL_GCC_9 if BR2_ARCH_NEEDS_GCC_AT_LEAST_9
default BR2_TOOLCHAIN_EXTERNAL_GCC_8 if BR2_ARCH_NEEDS_GCC_AT_LEAST_8
default BR2_TOOLCHAIN_EXTERNAL_GCC_7 if BR2_ARCH_NEEDS_GCC_AT_LEAST_7
default BR2_TOOLCHAIN_EXTERNAL_GCC_6 if BR2_ARCH_NEEDS_GCC_AT_LEAST_6
default BR2_TOOLCHAIN_EXTERNAL_GCC_5 if BR2_ARCH_NEEDS_GCC_AT_LEAST_5
default BR2_TOOLCHAIN_EXTERNAL_GCC_4_9 if BR2_ARCH_NEEDS_GCC_AT_LEAST_4_9
default BR2_TOOLCHAIN_EXTERNAL_GCC_4_8 if BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
default BR2_TOOLCHAIN_EXTERNAL_GCC_4_3
help
Set to the gcc version that is used by your external
toolchain.
@ -45,62 +37,50 @@ config BR2_TOOLCHAIN_EXTERNAL_GCC_9
config BR2_TOOLCHAIN_EXTERNAL_GCC_8
bool "8.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_9
select BR2_TOOLCHAIN_GCC_AT_LEAST_8
config BR2_TOOLCHAIN_EXTERNAL_GCC_7
bool "7.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_8
select BR2_TOOLCHAIN_GCC_AT_LEAST_7
config BR2_TOOLCHAIN_EXTERNAL_GCC_6
bool "6.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_7
select BR2_TOOLCHAIN_GCC_AT_LEAST_6
config BR2_TOOLCHAIN_EXTERNAL_GCC_5
bool "5.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_6
select BR2_TOOLCHAIN_GCC_AT_LEAST_5
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_9
bool "4.9.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_5
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_9
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_8
bool "4.8.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_9
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_7
bool "4.7.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_7
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_6
bool "4.6.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_6
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_5
bool "4.5.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_5
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_4
bool "4.4.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_4
config BR2_TOOLCHAIN_EXTERNAL_GCC_4_3
bool "4.3.x"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
select BR2_TOOLCHAIN_GCC_AT_LEAST_4_3
config BR2_TOOLCHAIN_EXTERNAL_GCC_OLD
bool "older"
depends on !BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
help
Use this option if your GCC version is older than any of the
above.