[Github-comments] [geany] "which $CXX" breaks if CXX consists of several items (#829)

[Colomban Wendling]

Agreed it's broken, we should have a better fix for this -- I don't remember exactly, but IIRC it's something about `AC_PROG_CXX` setting `CXX` to `g++` if it didn't find no compiler at all, and us wanting to fail hard at configure time instead.

Anyway, as a workaround until it gets fixed, you can set `CXXFLAGS` to `-isystem /sysroot/foo` instead of having this in `CXX` itself.

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https://github.com/geany/geany/issues/829#issuecomment-165582221
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