[yocto] Changing HOST_CC_ARCH temporarily in recipe

[Damien LEFEVRE]

Yeah that's true and that's how I fixed it =)

Thanks,
-Damien

On Wed, Sep 18, 2019 at 11:44 AM <Mikko.Rapeli at bmw.de> wrote:

> Hi,
>
> On Wed, Sep 18, 2019 at 11:26:29AM +0300, Damien LEFEVRE wrote:
> > Hi,
> >
> > I have a package which requires to first build a x64 binary which is then
> > used to compile the target platform binaries.
> >
> > The way I got away with it was to build that host binary from
> > do_configure_prepend() and then continue with the build procedure.
> >
> > I recently upgraded to GCC7 + warrior and now building the host binary
> > from do_configure_prepend fails due to this error:
> > testCCompiler.c:1:0: error: bad value (armv8-a+crc) for -march= switch
> >
> > I figured that the arch switch (building for tegra) is defined
> > in HOST_CC_ARCH as:
> > -march=armv8-a+crc -fstack-protector-strong  -D_FORTIFY_SOURCE=2 -Wformat
> > -Wformat-security -Werror=format-security
> >
> > If I clear HOST_CC_ARCH in my recipe file, do_configure_prepend succeeds
> > but of course the rest of the build will fail.
> >
> > So i'm trying to do something like this:
> > do_configure_prepend(){
> >     export HOST_CC_ARCH_BACKUP="${HOST_CC_ARCH}"
> >     HOST_CC_ARCH=""
> >     echo "HOST_CC_ARCH before cmake: ${HOST_CC_ARCH}"
> >     CC="${BUILD_CC}" CXX="${BUILD_CXX}" CCFLAGS="${BUILD_CFLAGS}"
> >  CXXFLAGS="${BUILD_CPPFLAGS} -std=c++11" LDFLAGS="${BUILD_LDFLAGS}" cmake
> > ${S}
> >     make
> >     HOST_CC_ARCH="${HOST_CC_ARCH_BACKUP}"
> > }
> >
> > There I still get:
> > HOST_CC_ARCH before cmake:  -march=armv8-a+crc -fstack-protector-strong
> >  -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security
> >
> > So HOST_CC_ARCH doesn't get updated.
> >
> > How can I temporarily reset HOST_CC_ARCH?
>
> Only clean way to do this is to split the recipe into two parts:
>
>  * native for the build time tooling
>
>  * target for the target only build, which depends on the native build
>    time tooling
>
> Everything else is a hack :)
>
> Hope this helps,
>
> -Mikko
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