[CMake] Prefer clang over gcc

[Rolf Eike Beer]

Am Sonntag, 24. Juni 2018, 11:32:32 CEST schrieb Quaquaraquà:
> Dear users,
> 
> how do you specify the order of compilers to select from the system?
> That is, if the user didn't set neither CMAKE_C_COMPILER nor the env.
> var. CC, I wish the build system would pick one of the compilers from a
> given list. In AutoConf, this is achieved through AC_PROG_CC([clang gcc
> icc cc]) [1]. What would be the corresponding snippet in cmake?

CMake will look at /usr/bin/cc if nothing else is set.

Eike
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