6b3993b0bf
The test "complex" sets the variable CMAKE_BACKWARDS_COMPATIBILITY to 1.4. When that variable is set, configure_file does not default to IMMEDIATE mode processing. And so, the output file likely does not exist yet by the time the next line in the CMakeLists.txt file is processed. When that next line is "try_compile" on that file, this is a problem. Fix the problem by explicitly using IMMEDIATE in the configure_file call. This problem was quite mysterious, as it only showed up on the "complex" test, when the previous commit introduced a CheckSymbolExists call into the FindThreads module. Which is not even explicitly included in the "complex" test... FindThreads gets included indirectly only as a side effect of setting CMAKE_BACKWARDS_COMPATIBILITY to 1.4 and even then it's included indirectly by auto-inclusion of CMakeBackwardCompatibilityC.cmake... Wow. Just wow.
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