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enable_language (OBJC) include(CheckSourceRuns) set(OBJC 1) # test that this is tolerated check_source_runs(OBJC [[ #import <Foundation/Foundation.h> int main() { NSObject *foo; return 0; } ]] SHOULD_BUILD) if(NOT SHOULD_BUILD) message(SEND_ERROR "Test fail for valid OBJC source.") endif()