internal string GenerateReferencingSource(string reference_m, IEnumerable <Symbol> symbols)
#endif
{
if (!symbols.Any())
{
if (File.Exists(reference_m))
{
File.Delete(reference_m);
}
#if MTOUCH
yield break;
#else
return(null);
#endif
}
var sb = new StringBuilder();
sb.AppendLine("#import <Foundation/Foundation.h>");
foreach (var symbol in symbols)
{
switch (symbol.Type)
{
case SymbolType.Function:
case SymbolType.Field:
sb.Append("extern void * ").Append(symbol.Name).AppendLine(";");
break;
case SymbolType.ObjectiveCClass:
sb.AppendLine($"@interface {symbol.ObjectiveCName} : NSObject @end");
break;
default:
throw ErrorHelper.CreateError(99, Errors.MX0099, $"invalid symbol type {symbol.Type} for symbol {symbol.Name}");
}
}
sb.AppendLine("static void __xamarin_symbol_referencer () __attribute__ ((used)) __attribute__ ((optnone));");
sb.AppendLine("void __xamarin_symbol_referencer ()");
sb.AppendLine("{");
sb.AppendLine("\tvoid *value;");
foreach (var symbol in symbols)
{
switch (symbol.Type)
{
case SymbolType.Function:
case SymbolType.Field:
sb.AppendLine($"\tvalue = {symbol.Name};");
break;
case SymbolType.ObjectiveCClass:
sb.AppendLine($"\tvalue = [{symbol.ObjectiveCName} class];");
break;
default:
throw ErrorHelper.CreateError(99, Errors.MX0099, $"invalid symbol type {symbol.Type} for symbol {symbol.Name}");
}
}
sb.AppendLine("}");
sb.AppendLine();
Driver.WriteIfDifferent(reference_m, sb.ToString(), true);
#if MTOUCH
foreach (var abi in GetArchitectures(AssemblyBuildTarget.StaticObject))
{
var arch = abi.AsArchString();
var reference_o = Path.Combine(Path.GetDirectoryName(reference_m), arch, Path.GetFileNameWithoutExtension(reference_m) + ".o");
var compile_task = new CompileTask {
Target = this,
Abi = abi,
InputFile = reference_m,
OutputFile = reference_o,
SharedLibrary = false,
Language = "objective-c",
};
yield return(compile_task);
}
#else
return(reference_m);
#endif
}
public void NativeLink()
{
if (!string.IsNullOrEmpty(App.UserGccFlags))
{
App.DeadStrip = false;
}
if (App.EnableLLVMOnlyBitCode)
{
App.DeadStrip = false;
}
var compiler_flags = new CompilerFlags()
{
Target = this
};
// Get global frameworks
compiler_flags.AddFrameworks(App.Frameworks, App.WeakFrameworks);
compiler_flags.AddFrameworks(Frameworks, WeakFrameworks);
// Collect all LinkWith flags and frameworks from all assemblies.
foreach (var a in Assemblies)
{
compiler_flags.AddFrameworks(a.Frameworks, a.WeakFrameworks);
if (!App.FastDev || App.IsSimulatorBuild)
{
compiler_flags.AddLinkWith(a.LinkWith, a.ForceLoad);
}
compiler_flags.AddOtherFlags(a.LinkerFlags);
}
var bitcode = App.EnableBitCode;
if (bitcode)
{
compiler_flags.AddOtherFlag(App.EnableMarkerOnlyBitCode ? "-fembed-bitcode-marker" : "-fembed-bitcode");
}
if (App.EnablePie.HasValue && App.EnablePie.Value && (App.DeploymentTarget < new Version(4, 2)))
{
ErrorHelper.Error(28, "Cannot enable PIE (-pie) when targeting iOS 4.1 or earlier. Please disable PIE (-pie:false) or set the deployment target to at least iOS 4.2");
}
if (!App.EnablePie.HasValue)
{
App.EnablePie = true;
}
if (App.Platform == ApplePlatform.iOS)
{
if (App.EnablePie.Value && (App.DeploymentTarget >= new Version(4, 2)))
{
compiler_flags.AddOtherFlag("-Wl,-pie");
}
else
{
compiler_flags.AddOtherFlag("-Wl,-no_pie");
}
}
CompileTask.GetArchFlags(compiler_flags, Abis);
if (App.IsDeviceBuild)
{
compiler_flags.AddOtherFlag($"-m{Driver.GetTargetMinSdkName (App)}-version-min={App.DeploymentTarget}");
compiler_flags.AddOtherFlag($"-isysroot {Driver.Quote (Driver.GetFrameworkDirectory (App))}");
}
else
{
CompileTask.GetSimulatorCompilerFlags(compiler_flags, null, App);
}
compiler_flags.LinkWithMono();
compiler_flags.LinkWithXamarin();
compiler_flags.AddLinkWith(link_with);
compiler_flags.AddOtherFlag($"-o {Driver.Quote (Executable)}");
compiler_flags.AddOtherFlag("-lz");
compiler_flags.AddOtherFlag("-liconv");
bool need_libcpp = false;
if (App.EnableBitCode)
{
need_libcpp = true;
}
#if ENABLE_BITCODE_ON_IOS
need_libcpp = true;
#endif
if (need_libcpp)
{
compiler_flags.AddOtherFlag("-lc++");
}
// allow the native linker to remove unused symbols (if the caller was removed by the managed linker)
if (!bitcode)
{
// Note that we include *all* (__Internal) p/invoked symbols here
// We also include any fields from [Field] attributes.
compiler_flags.ReferenceSymbols(GetRequiredSymbols());
}
string mainlib;
if (App.IsWatchExtension)
{
mainlib = "libwatchextension.a";
compiler_flags.AddOtherFlag(" -e _xamarin_watchextension_main");
}
else if (App.IsTVExtension)
{
mainlib = "libtvextension.a";
}
else if (App.IsExtension)
{
mainlib = "libextension.a";
}
else
{
mainlib = "libapp.a";
}
var libdir = Path.Combine(Driver.GetProductSdkDirectory(App), "usr", "lib");
var libmain = Path.Combine(libdir, mainlib);
compiler_flags.AddLinkWith(libmain, true);
if (App.EnableProfiling)
{
string libprofiler;
if (App.FastDev)
{
libprofiler = Path.Combine(libdir, "libmono-profiler-log.dylib");
compiler_flags.AddLinkWith(libprofiler);
}
else
{
libprofiler = Path.Combine(libdir, "libmono-profiler-log.a");
compiler_flags.AddLinkWith(libprofiler);
if (!App.EnableBitCode)
{
compiler_flags.ReferenceSymbol("mono_profiler_startup_log");
}
}
}
if (!string.IsNullOrEmpty(App.UserGccFlags))
{
compiler_flags.AddOtherFlag(App.UserGccFlags);
}
if (App.DeadStrip)
{
compiler_flags.AddOtherFlag("-dead_strip");
}
if (App.IsExtension)
{
if (App.Platform == ApplePlatform.iOS && Driver.XcodeVersion.Major < 7)
{
compiler_flags.AddOtherFlag("-lpkstart");
compiler_flags.AddOtherFlag($"-F {Driver.Quote (Path.Combine (Driver.GetFrameworkDirectory (App), "System/Library/PrivateFrameworks"))} -framework PlugInKit");
}
compiler_flags.AddOtherFlag("-fapplication-extension");
}
compiler_flags.Inputs = new List <string> ();
var flags = compiler_flags.ToString(); // This will populate Inputs.
if (!Application.IsUptodate(compiler_flags.Inputs, new string [] { Executable }))
{
// always show the native linker warnings since many of them turn out to be very important
// and very hard to diagnose otherwise when hidden from the build output. Ref: bug #2430
var linker_errors = new List <Exception> ();
var output = new StringBuilder();
var code = Driver.RunCommand(App.CompilerPath, flags, null, output);
Application.ProcessNativeLinkerOutput(this, output.ToString(), link_with, linker_errors, code != 0);
if (code != 0)
{
// if the build failed - it could be because of missing frameworks / libraries we identified earlier
foreach (var assembly in Assemblies)
{
if (assembly.UnresolvedModuleReferences == null)
{
continue;
}
foreach (var mr in assembly.UnresolvedModuleReferences)
{
// TODO: add more diagnose information on the warnings
var name = Path.GetFileNameWithoutExtension(mr.Name);
linker_errors.Add(new MonoTouchException(5215, false, "References to '{0}' might require additional -framework=XXX or -lXXX instructions to the native linker", name));
}
}
// mtouch does not validate extra parameters given to GCC when linking (--gcc_flags)
if (!String.IsNullOrEmpty(App.UserGccFlags))
{
linker_errors.Add(new MonoTouchException(5201, true, "Native linking failed. Please review the build log and the user flags provided to gcc: {0}", App.UserGccFlags));
}
linker_errors.Add(new MonoTouchException(5202, true, "Native linking failed. Please review the build log.", App.UserGccFlags));
}
ErrorHelper.Show(linker_errors);
}
else
{
cached_executable = true;
Driver.Log(3, "Target '{0}' is up-to-date.", Executable);
}
// the native linker can prefer private (and existing) over public (but non-existing) framework when weak_framework are used
// on an iOS target version where the framework does not exists, e.g. targeting iOS6 for JavaScriptCore added in iOS7 results in
// /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore instead of
// /System/Library/Frameworks/JavaScriptCore.framework/JavaScriptCore
// more details in https://bugzilla.xamarin.com/show_bug.cgi?id=31036
if (WeakFrameworks.Count > 0)
{
AdjustDylibs();
}
Driver.Watch("Native Link", 1);
}
