make it ccache friendly about osxcross

[tpoechtrager]

Yes, the wrapper is ignoring ccache symlinks while searching for the clang executable (to prevent breakage).

The proper way is to create x86_64-apple-darwin*-[clang|gcc] ccache symlinks,

e.g.:

cd /usr/lib64/ccache

ln -sf $(which ccache) x86_64-apple-darwin14-clang
ln -sf $(which ccache) x86_64-apple-darwin14-clang++
ln -sf $(which ccache) o32-clang
ln -sf $(which ccache) o32-clang++
ln -sf $(which ccache) o64-clang
ln -sf $(which ccache) o64-clang++
ln -sf $(which ccache) x86_64-apple-darwin14-gcc
ln -sf $(which ccache) x86_64-apple-darwin14-g++
[... and so on]

[pisto]

I guess that can work.

[pisto]

No it doesn't work, I get the following warnings if I append the osxcross path and create the appropriate ccache symlinks:

clang: warning: argument unused during compilation: '-isystem /usr/bin/../lib/clang/3.5.0/include'
clang: warning: argument unused during compilation: '-cxx-isystem /home/pisto/sorgenti/osxcross/target/bin/../SDK/MacOSX10.10.sdk/usr/i

and a bunch of

warning: equality comparison with extraneous parentheses [-Wparentheses-equality]

cp. http://peter.eisentraut.org/blog/2014/12/01/ccache-and-clang-part-3/

[tpoechtrager]

It does work, that warnings are not an OSXCross issue, you get them for other targets too.