[Buildroot] [PATCH 2/3] Config.in: add symbols for BR2_HOST_GCC_AT_LEAST_X_Y

[Yann E. MORIN <yann.morin.1998@free.fr>]

Arnout, All,

On 2015-11-22 00:18 +0100, Arnout Vandecappelle (Essensium/Mind) spake thusly:
> Some host packages need a recent gcc version. Add symbols to Config.in
> to specify the HOSTCC version. The values are passed through the
> environment, and this environment is generated in a new support script.

I really don't like this...

Maybe it is a good candidate for a generated kconfig snippet, instead of
this generated-environment oddity?

Anyway, see below, you could generate only one environment variable,
instead of all of them...

> Also update the documentation to mention the new symbols.
> 
> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
> ---
>  Config.in                                 | 17 ++++++++++
>  Makefile                                  |  1 +
>  docs/manual/adding-packages-directory.txt |  7 ++++
>  support/scripts/gcc-version-variables     | 56 +++++++++++++++++++++++++++++++
>  4 files changed, 81 insertions(+)
>  create mode 100755 support/scripts/gcc-version-variables
> 
> diff --git a/Config.in b/Config.in
> index d795361..7bec90c 100644
> --- a/Config.in
> +++ b/Config.in
> @@ -18,6 +18,23 @@ config BR2_EXTERNAL
>  	string
>  	option env="BR2_EXTERNAL"
>  
> +# Hidden config symbols for packages to check system gcc version
> +config BR2_HOST_GCC_AT_LEAST_4_7
> +	bool
> +	option env="HOST_GCC_AT_LEAST_4_7"
> +
> +config BR2_HOST_GCC_AT_LEAST_4_8
> +	bool
> +	option env="HOST_GCC_AT_LEAST_4_8"
> +
> +config BR2_HOST_GCC_AT_LEAST_4_9
> +	bool
> +	option env="HOST_GCC_AT_LEAST_4_9"
> +
> +config BR2_HOST_GCC_AT_LEAST_5
> +	bool
> +	option env="HOST_GCC_AT_LEAST_5"

If you make each of those options actually select the N-1 option, then
all you need if to set one environment variable.

[--SNIP--]
> diff --git a/docs/manual/adding-packages-directory.txt b/docs/manual/adding-packages-directory.txt
> index 139123e..c2d9f75 100644
> --- a/docs/manual/adding-packages-directory.txt
> +++ b/docs/manual/adding-packages-directory.txt
> @@ -283,6 +283,13 @@ use in the comment.
>  ** Comment string: +gcc >= X.Y+ and/or `gcc <= X.Y` (replace
>     +X.Y+ with the proper version)
>  
> +* Host GCC version
> +** Dependency symbol: +BR2_HOST_GCC_AT_LEAST_X_Y+, (replace
> +   +X_Y+ with the proper version, see +Config.in+)
> +** Comment string: no comment to be added
> +** Note that it is usually not the package itself that has a minimum
> +   host GCC version, but rather a host-package on which it depends.

Well, in case the package builds an internal host tool, and properly
separates BUILD_CC from CC, then the restriction does apply to the
package itself and not a host-package.

Regards,
Yann E. MORIN.

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