[Buildroot] [PATCH] qt5: use ccache for building host code

Thomas Petazzoni thomas.petazzoni at bootlin.com
Mon Nov 5 07:49:34 UTC 2018

Hello Peter,

On Sun, 4 Nov 2018 22:46:38 +0100, Peter Seiderer wrote:

> Thanks for the answer (you got it right)...., so in case I use the
> buildroot-generated qmake I will always use ccache (if configured),
> even if used outside of the buildroot build system, right?

Well, in the context of Buildroot, qmake is essentially used to build
code for the target, using the cross-compiler. In this case, ccache was
already used, because invoking ccache is hidden inside the toolchain
wrapper, so there's no way around it :-)

However, I guess with the right qmake invocations, you can make it
build code for the host as well. And then yes, in this case, I assume
it would now start using ccache.

> The $(HOSTCC) is expanded at the sed command running time,
> g++-base.conf will contain 'QMAKE_COMPILER=gcc' or
> 'QMAKE_COMPILER=ccache gcc'...
> Not sure if this matters for some use cases...

What are you worried about? The fact that there is a space in the
QMAKE_COMPILER variable value ?

Best regards,

Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering

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