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enable_language (C)
include(CheckCSourceCompiles)
set(C 1) # test that this is tolerated
check_c_source_compiles("I don't build" SHOULD_FAIL)
if(SHOULD_FAIL)
message(SEND_ERROR "invalid C source didn't fail.")
endif()
check_c_source_compiles("int main() {return 0;}" SHOULD_BUILD)
if(NOT SHOULD_BUILD)
message(SEND_ERROR "Test fail for valid C source.")
endif()
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