Ben Boeckel 76305038ef determine full compiler version for gcc-7 ... Fixes #5778. Spack uses 'gcc -dumpversion' to determine the full version of gcc. 'gcc -dumpversion' no longer gives the full version on gcc 7.2.0. 'gcc -dumpfullversion' is required instead. This PR detects when 'gcc -dumpversion' gives a truncated version of '7' and in that case retrieves the full version with 'gcc -dumpfullversion'		2017-11-02 18:44:10 -07:00
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spack	determine full compiler version for gcc-7	2017-11-02 18:44:10 -07:00