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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 return 0;29 }30 ")31 32 try_run(errc_exit_code33 errc_compiled34 ${CMAKE_BINARY_DIR}35 ${errc_test_code}36 RUN_OUTPUT_VARIABLE errc_result37 COMPILE_OUTPUT_VARIABLE errc_compile_errors)38 if (errc_compiled AND "${errc_exit_code}" STREQUAL "0")39 set(${outvar} ${errc_result} PARENT_SCOPE)40 else()41 set(${outvar} "" PARENT_SCOPE)42 message(NOTICE "${errc_compile_errors}")43 message(STATUS "Failed to get errc messages")44 endif ()45endfunction()46