[Buildroot] [PATCH v2] package/boost: fixup Optimization flag in boost build

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

Michael, All,

On 2020-08-07 10:58 +0200, Michael Nosthoff spake thusly:
> When building with Boost Build the CXXFLAGS are extended depending
> on the optimization level set. When not defined explicitly the
> optimization level depends on the <variant>. For release it's 'speed'
> and for debug it's set to 'off'
> 
> These flags overwrite the -O flag passed in with TARGET_CXXFLAGS as
> it is appended when calling g++.
> 
> This commit sets the Optimization flags generated by Boost Build
> to the value of TARGET_OPTIMIZATION no matter what level is used.
> 
> As Boost Build offers no nice way to alter those values the gcc
> toolchain file is altered directly.
> 
> Signed-off-by: Michael Nosthoff <buildroot@heine.tech>

Applied to master, thanks.

Ultimately, it would be nice if upstream had a provision to not set the
optimisation level.

For example, in addition to the existign three levels, 'off', 'speed',
and 'space' (IIRC), maybe suggest they add a new one, maybe 'none', that
would not set any -O flag at all, thus using whatever the user would set
in their CXXFLAGS, or whatever the compiler defaults to...

Regards,
Yann E. MORIN.

> ---
> 
> v1 -> v2:
>   - use sed to manipulate gcc.jam directly
>   - remove extending user-config.jam
> 
> ---
>  package/boost/boost.mk | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/package/boost/boost.mk b/package/boost/boost.mk
> index ef638fc9df..323802488d 100644
> --- a/package/boost/boost.mk
> +++ b/package/boost/boost.mk
> @@ -134,6 +134,7 @@ define BOOST_CONFIGURE_CMDS
>  	(cd $(@D) && ./bootstrap.sh $(BOOST_FLAGS))
>  	echo "using gcc : `$(TARGET_CC) -dumpversion` : $(TARGET_CXX) : <cxxflags>\"$(BOOST_TARGET_CXXFLAGS)\" <linkflags>\"$(TARGET_LDFLAGS)\" ;" > $(@D)/user-config.jam
>  	echo "" >> $(@D)/user-config.jam
> +	sed -i "s/: -O.* ;/: $(TARGET_OPTIMIZATION) ;/" $(@D)/tools/build/src/tools/gcc.jam
>  endef
>  
>  define BOOST_BUILD_CMDS
> -- 
> 2.25.1
> 
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