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Commit 775fe807 authored by Sam Yates's avatar Sam Yates Committed by Benjamin Cumming
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Test for xlC and refuse to build with it. (#519) 

Fixes issue #517.

Deprecate the IBM xlC compiler.
xlC generates code that is an order of a magnitude slower than gcc, while generating spurious warnings, and requiring hacks and workarounds to pass all tests.
Supporting it makes no sense.

* Add test and fatal error for xlC detection in CheckCompilerXLC.cmake.
* Move xlC 13 misdetection work around to CheckCompilerXLC.cmake.
* Remove xlC-specific compatibility workarounds from code.
parent 40612fa7
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