Cache qt_config_compile_test results

Inside qt_config_compile_test we use two different calls:
check_cxx_source_compiles when given code, and try_compile when
given a project.

The former caches its results, while the latter does not, which means
that the try_compile calls are re-executed on each reconfigure.

Do what check_cxx_source_compiles does internally, and don't rerun
the try_compile calls if the results were computed once.

Change-Id: I2691ff08b7bb46c3fa60bbf5ed6278731c9b8e21
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

0 files changed, 0 insertions, 0 deletions