Do not override CXXFLAGS from external build system

[dwrobel]

Signed-off-by: Damian Wrobel [email protected]

[dwrobel]

I was trying to check the fix for #90 but libcamera-apps stopped to compile.

The problem is that you're overwriting all options passed to cmake via CXXFLAGS env. variable - which is usually used by the build system (rpm, deb). FYI, I had to pass -fPIC as otherwise linker generates the following error:

/usr/bin/ld: CMakeFiles/libcamera-jpeg.dir/libcamera_jpeg.cpp.o: relocation R_ARM_MOVW_ABS_NC against `_ZN12LibcameraApp12QueueRequestERK16CompletedRequest' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: CMakeFiles/libcamera-jpeg.dir/libcamera_jpeg.cpp.o(.text+0x44): unresolvable R_ARM_MOVW_ABS_NC relocation against symbol `_ZN12LibcameraApp12QueueRequestERK16CompletedRequest'

Full compilation log: https://download.copr.fedorainfracloud.org/results/dwrobel/libcamera-apps/fedora-rawhide-armhfp/02879524-libcamera-apps/build.log.gz.

[naushir]

LGTM. I will merge this now.

@dwrobel, feel free to create another PR with the -fPIC option and we can review that separately.