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# This function returns the messages of various POSIX error codes as they are returned by std::error_code.
# The purpose of this function is to supply those error messages to llvm-lit using the errc_messages config.
# Currently supplied and needed error codes: ENOENT, EISDIR, EINVAL and EACCES.
# Messages are semi colon separated.
# Keep amount, order and tested error codes in sync with llvm/utils/lit/lit/llvm/config.py.
function(get_errc_messages outvar)
if(CMAKE_CROSSCOMPILING AND NOT CMAKE_CROSSCOMPILING_EMULATOR AND NOT DEFINED errc_exit_code)
set(${outvar} "" PARENT_SCOPE)
message(STATUS "Can't get errc messages in cross-compilation mode")
return()
endif()
set(errc_test_code ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/getErrc.cpp)
file(WRITE ${errc_test_code} "
#include <cerrno>
#include <iostream>
#include <string>
#include <system_error>
std::string getMessageFor(int err) {
return std::make_error_code(static_cast<std::errc>(err)).message();
}
int main() {
std::cout << getMessageFor(ENOENT) << ';' << getMessageFor(EISDIR);
std::cout << ';' << getMessageFor(EINVAL) << ';' << getMessageFor(EACCES);
return 0;
}
")
try_run(errc_exit_code
errc_compiled
${CMAKE_BINARY_DIR}
${errc_test_code}
RUN_OUTPUT_VARIABLE errc_result
COMPILE_OUTPUT_VARIABLE errc_compile_errors)
if (errc_compiled AND "${errc_exit_code}" STREQUAL "0")
set(${outvar} ${errc_result} PARENT_SCOPE)
else()
set(${outvar} "" PARENT_SCOPE)
message(NOTICE "${errc_compile_errors}")
message(STATUS "Failed to get errc messages")
endif ()
endfunction()
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