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

[Yann E. MORIN]

Michael, All,

On 2020-08-05 14:41 +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.
> 
> Signed-off-by: Michael Nosthoff <buildroot at heine.tech>
> ---
>  package/boost/boost.mk | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/package/boost/boost.mk b/package/boost/boost.mk
> index ef638fc9df..1fcb264062 100644
> --- a/package/boost/boost.mk
> +++ b/package/boost/boost.mk
> @@ -134,6 +134,11 @@ 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
> +	echo "import modules ;" >> $(@D)/user-config.jam
> +	echo "modules.poke gcc : flags gcc.compile OPTIONS <optimization>off : $(TARGET_OPTIMIZATION) ;" >> $(@D)/user-config.jam
> +	echo "modules.poke gcc : flags gcc.compile OPTIONS <optimization>speed : $(TARGET_OPTIMIZATION) ;" >> $(@D)/user-config.jam
> +	echo "modules.poke gcc : flags gcc.compile OPTIONS <optimization>space : $(TARGET_OPTIMIZATION) ;" >> $(@D)/user-config.jam

Unfortunately, that does not seem to work:

    gcc.compile.c++ bin.v2/libs/thread/build/gcc-9.2.1/release/threadapi-pthread/threading-multi/visibility-hidden/pthread/thread.o
    "/home/ymorin/dev/buildroot/O/host/bin/arm-none-linux-gnueabihf-g++"
        -fvisibility-inlines-hidden -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
        -D_FILE_OFFSET_BITS=64  -Os   -fPIC -pthread -O3 -finline-functions
        -Wno-inline -Wall -fvisibility=hidden -Wextra -Wno-long-long
        -Wno-unused-parameter -Wunused-function -pedantic -DBOOST_ALL_NO_LIB=1
        -DBOOST_THREAD_BUILD_DLL=1 -DBOOST_THREAD_DONT_USE_CHRONO
        -DBOOST_THREAD_POSIX -DNDEBUG  -I"." -c -o
        "bin.v2/libs/thread/build/gcc-9.2.1/release/threadapi-pthread/threading-multi/visibility-hidden/pthread/thread.o"
        "libs/thread/src/pthread/thread.cpp"

(indentation mine)

Regards,
Yann E. MORIN.

> +	echo "" >> $(@D)/user-config.jam
>  endef
>  
>  define BOOST_BUILD_CMDS
> -- 
> 2.25.1
> 
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