fx-carton b62e306222 Fix cflags parsing (#2510, #2265) (#2590) ...

* Parse CFLAGS that can be passed using a whitelist

I went through GCC's man page and selected flags that can safely be
passed to GCC and that can be useful to syntax checking. These include:

- -I/-i* include flags
- preprocessor flags such as -D
- -W* warning flags
- -O* optimization flags
- most -f options
- -m arch dependent options

* Fix CFLAGS tests: -Idir is now parsed to -I dir
* Added two tests for flags we want or don't want to pass.
* Also check for / in addition to s:sep

2019-08-17 19:08:14 +01:00

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