public override CPPOutput CompileCPPFiles(CPPEnvironment CompileEnvironment, List<FileItem> SourceFiles, string ModuleName)
{
string Arguments = GetCLArguments_Global(CompileEnvironment);
string PCHArguments = "";
if (CompileEnvironment.Config.PrecompiledHeaderAction == PrecompiledHeaderAction.Include)
{
// Add the precompiled header file's path to the include path so Clang can find it.
// This needs to be before the other include paths to ensure Clang uses it instead of the source header file.
PCHArguments += string.Format(" -include \"{0}\"", CompileEnvironment.PrecompiledHeaderFile.AbsolutePath.Replace(".gch", ""));
}
// Add include paths to the argument list.
foreach (string IncludePath in CompileEnvironment.Config.IncludePaths)
{
Arguments += string.Format(" -I\"{0}\"", IncludePath);
}
foreach (string IncludePath in CompileEnvironment.Config.SystemIncludePaths)
{
Arguments += string.Format(" -I\"{0}\"", IncludePath);
}
// Add preprocessor definitions to the argument list.
foreach (string Definition in CompileEnvironment.Config.Definitions)
{
Arguments += string.Format(" -D \"{0}\"", Definition);
}
// Create a compile action for each source file.
CPPOutput Result = new CPPOutput();
foreach (FileItem SourceFile in SourceFiles)
{
Action CompileAction = new Action(ActionType.Compile);
string FileArguments = "";
string Extension = Path.GetExtension(SourceFile.AbsolutePath).ToUpperInvariant();
// Add C or C++ specific compiler arguments.
if (CompileEnvironment.Config.PrecompiledHeaderAction == PrecompiledHeaderAction.Create)
{
FileArguments += GetCompileArguments_PCH();
}
else if (Extension == ".C")
{
// Compile the file as C code.
FileArguments += GetCompileArguments_C();
}
else if (Extension == ".CC")
{
// Compile the file as C++ code.
FileArguments += GetCompileArguments_CPP();
}
else if (Extension == ".MM")
{
// Compile the file as Objective-C++ code.
FileArguments += GetCompileArguments_MM();
}
else if (Extension == ".M")
{
// Compile the file as Objective-C code.
FileArguments += GetCompileArguments_M();
}
else
{
FileArguments += GetCompileArguments_CPP();
// only use PCH for .cpp files
FileArguments += PCHArguments;
}
// Add the C++ source file and its included files to the prerequisite item list.
CompileAction.PrerequisiteItems.Add(SourceFile);
foreach (FileItem IncludedFile in CompileEnvironment.GetIncludeDependencies(SourceFile))
{
CompileAction.PrerequisiteItems.Add(IncludedFile);
}
if (CompileEnvironment.Config.PrecompiledHeaderAction == PrecompiledHeaderAction.Create)
{
// Add the precompiled header file to the produced item list.
FileItem PrecompiledHeaderFile = FileItem.GetItemByPath(
Path.Combine(
CompileEnvironment.Config.OutputDirectory,
Path.GetFileName(SourceFile.AbsolutePath) + ".gch"
)
);
CompileAction.ProducedItems.Add(PrecompiledHeaderFile);
Result.PrecompiledHeaderFile = PrecompiledHeaderFile;
// Add the parameters needed to compile the precompiled header file to the command-line.
FileArguments += string.Format(" -o \"{0}\"", PrecompiledHeaderFile.AbsolutePath, false);
}
else
{
if (CompileEnvironment.Config.PrecompiledHeaderAction == PrecompiledHeaderAction.Include)
{
CompileAction.bIsUsingPCH = true;
CompileAction.PrerequisiteItems.Add(CompileEnvironment.PrecompiledHeaderFile);
}
// Add the object file to the produced item list.
FileItem ObjectFile = FileItem.GetItemByPath(
Path.Combine(
CompileEnvironment.Config.OutputDirectory,
Path.GetFileName(SourceFile.AbsolutePath) + ".o"
)
);
CompileAction.ProducedItems.Add(ObjectFile);
Result.ObjectFiles.Add(ObjectFile);
FileArguments += string.Format(" -o \"{0}\"", ObjectFile.AbsolutePath, false);
}
// Add the source file path to the command-line.
FileArguments += string.Format(" \"{0}\"", SourceFile.AbsolutePath);
CompileAction.WorkingDirectory = Path.GetFullPath(".");
CompileAction.CommandPath = ClangPath;
CompileAction.CommandArguments = Arguments + FileArguments + CompileEnvironment.Config.AdditionalArguments;
CompileAction.StatusDescription = string.Format("{0}", Path.GetFileName(SourceFile.AbsolutePath));
CompileAction.StatusDetailedDescription = SourceFile.Description;
CompileAction.bIsGCCCompiler = true;
// Don't farm out creation of pre-compiled headers as it is the critical path task.
CompileAction.bCanExecuteRemotely =
CompileEnvironment.Config.PrecompiledHeaderAction != PrecompiledHeaderAction.Create ||
BuildConfiguration.bAllowRemotelyCompiledPCHs;
CompileAction.OutputEventHandler = new DataReceivedEventHandler(CompileOutputReceivedDataEventHandler);
}
return Result;
}
static string GetCLArguments_Global(CPPEnvironment CompileEnvironment)
{
string Result = "";
// build up the commandline common to C and C++
Result += " -c";
Result += " -pipe";
Result += " -fomit-frame-pointer";
Result += " -fno-exceptions"; // no exceptions
Result += " -funwind-tables"; // generate unwind tables as they seem to be needed for stack tracing (why??)
Result += " -Wall -Werror";
Result += " -Wsequence-point"; // additional warning not normally included in Wall: warns if order of operations is ambigious
//Result += " -Wunreachable-code"; // additional warning not normally included in Wall: warns if there is code that will never be executed - not helpful due to bIsGCC and similar
//Result += " -Wshadow"; // additional warning not normally included in Wall: warns if there variable/typedef shadows some other variable - not helpful because we have gobs of code that shadows variables
Result += " -mmmx -msse -msse2"; // allows use of SIMD intrinsics
Result += " -fno-math-errno"; // do not assume that math ops have side effects
Result += " -fdiagnostics-format=msvc"; // make diagnostics compatible with MSVC
Result += " -Wno-unused-variable";
// this will hide the warnings about static functions in headers that aren't used in every single .cpp file
Result += " -Wno-unused-function";
// this hides the "enumeration value 'XXXXX' not handled in switch [-Wswitch]" warnings - we should maybe remove this at some point and add UE_LOG(, Fatal, ) to default cases
Result += " -Wno-switch";
// this hides the "warning : comparison of unsigned expression < 0 is always false" type warnings due to constant comparisons, which are possible with template arguments
Result += " -Wno-tautological-compare";
Result += " -Wno-unknown-pragmas"; // Slate triggers this (with its optimize on/off pragmas)
Result += " -Wno-unused-private-field"; // MultichannelTcpSocket.h triggers this, possibly more
Result += " -Wno-invalid-offsetof"; // needed to suppress warnings about using offsetof on non-POD types.
//Result += " -DOPERATOR_NEW_INLINE=FORCENOINLINE";
// shipping builds will cause this warning with "ensure", so disable only in those case
if (CompileEnvironment.Config.TargetConfiguration == CPPTargetConfiguration.Shipping)
{
Result += " -Wno-unused-value";
}
// debug info
if (CompileEnvironment.Config.bCreateDebugInfo)
{
Result += " -g3";
}
else if (CompileEnvironment.Config.TargetConfiguration < CPPTargetConfiguration.Shipping)
{
Result += " -gline-tables-only"; // include debug info for meaningful callstacks
}
else
{
// in shipping, strip as much info as possible
Result += " -g0";
Result += " -fvisibility=hidden"; // prevents from exporting all symbols (reduces the size of the binary)
}
// optimization level
if (CompileEnvironment.Config.TargetConfiguration == CPPTargetConfiguration.Debug)
{
Result += " -O0";
}
else
{
Result += " -O3";
}
//Result += " -v"; // for better error diagnosis
Result += " -target x86_64-unknown-linux-gnu"; // Set target triple
Result += " -D _LINUX64";
Result += String.Format(" --sysroot={0}", BaseLinuxPath);
return Result;
}