Oh wow

... Looks like they not using GCC front end, Segger has it's own. (Is this unfortunate, or ?)
In SES the compiler is called by cc1
markuskrug, that's the backend ..
U dunno, I would be feeling better if it would be possible to use GCC front end, but .. I''ll see what they reply.
Edit:
So I gave it a quick try building external and note:
1) Tool Chain Directory was the only thing I had to change. Note, I tried GNU ARM v 6, and v7 latest . On sample project Hello only.
2) Unlike the internal (pre-installed) toolchain path - $(StudioDir)/gcc/$(GCCTarget)/bin - your external can point to the GCC bin folder, and the external build configuration
comes with pre-configured "External Build", which is all specified in GCC/G++ commands, so
Alleluah Jeses thank ya,

.
I'm starting to feel warmer