Cross-compile issue

[mike-2020]

Looks like the build system does not respect toolchain/arch setting in menuconfig. Even I set it to arm, it still tries to use x86 toolchain (host system toolchain).

[ 53%] Building C object asr_lib/CMakeFiles/asr_lib.dir/src/asr.c.o
cc1: error: bad value (‘armv7-a’) for ‘-march=’ switch
cc1: note: valid arguments to ‘-march=’ switch are: nocona core2 nehalem corei7 westmere sandybridge corei7-avx ivybridge core-avx-i haswell core-avx2 broadwell skylake skylake-avx512 cannonlake icelake-client rocketlake icelake-server cascadelake tigerlake cooperlake sapphirerapids alderlake bonnell atom silvermont slm goldmont goldmont-plus tremont knl knm x86-64 x86-64-v2 x86-64-v3 x86-64-v4 eden-x2 nano nano-1000 nano-2000 nano-3000 nano-x2 eden-x4 nano-x4 k8 k8-sse3 opteron opteron-sse3 athlon64 athlon64-sse3 athlon-fx amdfam10 barcelona bdver1 bdver2 bdver3 bdver4 znver1 znver2 znver3 btver1 btver2 native
make[2]: *** [asr_lib/CMakeFiles/asr_lib.dir/build.make:76: asr_lib/CMakeFiles/asr_lib.dir/src/asr.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:246: asr_lib/CMakeFiles/asr_lib.dir/all] Error 2