Re: [Buildroot] [PATCH 1/1] package/boost: enable all features except python on host

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

Fabrice, All,

+Peter K., +Thomas P., +Arnout.

On 2022-01-15 11:37 +0100, Fabrice Fontaine spake thusly:
> Enable all features except python on host variant as suggested by
> Yann E. Morin in
> https://patchwork.ozlabs.org/project/buildroot/patch/20220114171847.634174-1-fontaine.fabrice@gmail.com
> 
> Indeed, host packages have no way to express their dependencies on host
> boost

So, I was not expecting an actual patch so fast, and I was doing more
testing here...

So, with a recent-enough gcc (e.g. gcc-10 as is available in our Docker
image used in our CI), the full Boost (save for python) is indeed built.

So I gave it a shot on a much older system, like my autobuilder, that is
still running gcc-4.8. And there, only the headers component is built;
everything else is just skipped.

This means that host packages that depend on specific features of
host-boost will fail randomly depending on the host system, and there is
no way to prevent that, except by adding appropriate Config.in.host
options for host-boost.

Note: in our case, host-riscv-isa-sim already depends on gcc >= 4.9, so
it would not be selectable on my autobuilder. But still...

So I wonder what we should do... Any idea?

Regards,
Yann E. MORIN.

> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> ---
>  package/boost/boost.mk | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/package/boost/boost.mk b/package/boost/boost.mk
> index 2d2a8fb311..ad071ed206 100644
> --- a/package/boost/boost.mk
> +++ b/package/boost/boost.mk
> @@ -12,13 +12,7 @@ BOOST_LICENSE = BSL-1.0
>  BOOST_LICENSE_FILES = LICENSE_1_0.txt
>  BOOST_CPE_ID_VENDOR = boost
>  
> -# keep host variant as minimal as possible
> -HOST_BOOST_FLAGS = --without-icu --with-toolset=gcc \
> -	--without-libraries=$(subst $(space),$(comma),atomic chrono context \
> -	contract container coroutine date_time exception fiber filesystem graph \
> -	graph_parallel iostreams json locale log math mpi nowide program_options \
> -	python random serialization stacktrace test thread timer \
> -	type_erasure wave)
> +HOST_BOOST_FLAGS = --without-icu --with-toolset=gcc --without-libraries=python
>  
>  BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_ATOMIC),,atomic)
>  BOOST_WITHOUT_FLAGS += $(if $(BR2_PACKAGE_BOOST_CHRONO),,chrono)
> -- 
> 2.34.1
> 
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