Dmitry Kalinkin 96d2a6c434 ccache: improve compiler wrapper
* move compiler detection logic from nix to bash
* robust inheritance of isGNU/isClang

Fixes: d3274e8ae3 ('ccache: support clang in ccache.links')
Fixes: 634824d50b ('ccache: fix references to stdenv.cc.cc.isClang')
2016-09-18 14:54:12 -04:00
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2016-09-18 14:54:12 -04:00