Karl Palsson 7545a321b0 cortex-m7: improve compiler detection
Recent debian testing and ubuntu 15.10 releases contain a
gcc-arm-none-eabi toolchain that returns 0 for the test with -mcpu and
-fsyntax-only, despite not actually supporting cortex-m7.  They then
failed hard on actual compilation steps.

Use the --help=target output instead. tested with old g-a-e 4.7 and
newer releases.
2016-02-16 09:47:17 +00:00
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2016-02-16 09:47:17 +00:00