[CMake] Add RCC platform configuration checks

1 files changed, 45 insertions, 0 deletions

diff --git a/rcc/cmake/modules/GetErrcMessages.cmake b/rcc/cmake/modules/GetErrcMessages.cmake
new file mode 100644
index 0000000..ad94f6a
--- /dev/null
+++ b/rcc/cmake/modules/GetErrcMessages.cmake
@@ -0,0 +1,45 @@
+# 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 rcc-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 rcc/utils/lit/lit/rcc/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()