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I have to compile some libraries that need gcc 4.8 but I am on wheezy. another option is clang.

these are several libraries that downloaded automatically and called from installer so I can not modifies config to use clang.

how can I change default compiler to clang in debian instead?

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    Build scripts usually determine the "default compiler" by using the environment variable CC. Try to set it to clang and everything might work fine. – michas Jan 18 '17 at 7:05
5

Use the following:

sudo update-alternatives --install /usr/bin/cc cc /usr/bin/clang 100
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    Just a note for g++ users, you also want sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++ 100 – Brian Stamper Feb 21 '19 at 3:19

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