1# This function returns the messages of various POSIX error codes as they are returned by std::error_code. 2# The purpose of this function is to supply those error messages to llvm-lit using the errc_messages config. 3# Currently supplied and needed error codes: ENOENT, EISDIR, EINVAL and EACCES. 4# Messages are semi colon separated. 5# Keep amount, order and tested error codes in sync with llvm/utils/lit/lit/llvm/config.py. 6function(get_errc_messages outvar) 7 if(CMAKE_CROSSCOMPILING AND NOT CMAKE_CROSSCOMPILING_EMULATOR AND NOT DEFINED errc_exit_code) 8 set(${outvar} "" PARENT_SCOPE) 9 message(STATUS "Can't get errc messages in cross-compilation mode") 10 return() 11 endif() 12 13 set(errc_test_code ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/getErrc.cpp) 14 15 file(WRITE ${errc_test_code} " 16 #include <cerrno> 17 #include <iostream> 18 #include <string> 19 #include <system_error> 20 21 std::string getMessageFor(int err) { 22 return std::make_error_code(static_cast<std::errc>(err)).message(); 23 } 24 25 int main() { 26 std::cout << getMessageFor(ENOENT) << ';' << getMessageFor(EISDIR); 27 std::cout << ';' << getMessageFor(EINVAL) << ';' << getMessageFor(EACCES); 28 } 29 ") 30 31 try_run(errc_exit_code 32 errc_compiled 33 ${CMAKE_BINARY_DIR} 34 ${errc_test_code} 35 RUN_OUTPUT_VARIABLE errc_result 36 COMPILE_OUTPUT_VARIABLE errc_compile_errors) 37 if (errc_compiled AND "${errc_exit_code}" STREQUAL "0") 38 set(${outvar} ${errc_result} PARENT_SCOPE) 39 else() 40 set(${outvar} "" PARENT_SCOPE) 41 message(STATUS "Failed to get errc messages") 42 endif () 43endfunction() 44