protected override async Task ExecuteAsync()
{
// 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 cmd_length = Target.App.CompilerPath.Length + 1 + CompilerFlags.ToString().Length;
try {
var code = await Driver.RunCommandAsync(Target.App.CompilerPath, CompilerFlags.ToArray(), null, output, suppressPrintOnErrors : true);
Application.ProcessNativeLinkerOutput(Target, output.ToString(), CompilerFlags.AllLibraries, linker_errors, code != 0);
if (code != 0)
{
Console.WriteLine($"Process exited with code {code}, command:\n{Target.App.CompilerPath} {CompilerFlags.ToString ()}\n{output} ");
// if the build failed - it could be because of missing frameworks / libraries we identified earlier
foreach (var assembly in Target.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, Errors.MT5215, name));
}
}
// mtouch does not validate extra parameters given to GCC when linking (--gcc_flags)
if (Target.App.UserGccFlags?.Count > 0)
{
linker_errors.Add(new MonoTouchException(5201, true, Errors.MT5201, StringUtils.FormatArguments(Target.App.UserGccFlags)));
}
else
{
linker_errors.Add(new MonoTouchException(5202, true, Errors.MT5202));
}
if (code == 255)
{
// check command length
// getconf ARG_MAX
StringBuilder getconf_output = new StringBuilder();
if (Driver.RunCommand("getconf", new [] { "ARG_MAX" }, output: getconf_output, suppressPrintOnErrors: true) == 0)
{
int arg_max;
if (int.TryParse(getconf_output.ToString().Trim(' ', '\t', '\n', '\r'), out arg_max))
{
if (cmd_length > arg_max)
{
linker_errors.Add(ErrorHelper.CreateError(5217, Errors.MT5217, cmd_length));
}
else
{
Driver.Log(3, $"Linker failure is probably not due to command-line length (actual: {cmd_length} limit: {arg_max}");
}
}
else
{
Driver.Log(3, "Failed to parse 'getconf ARG_MAX' output: {0}", getconf_output);
}
}
else
{
Driver.Log(3, "Failed to execute 'getconf ARG_MAX'\n{0}", getconf_output);
}
}
}
} catch (System.ComponentModel.Win32Exception wex) {
/* This means we failed to execute the linker, not that the linker itself returned with a failure */
if (wex.NativeErrorCode == 7 /* E2BIG = Too many arguments */)
{
linker_errors.Add(ErrorHelper.CreateError(5217, wex, Errors.MT5217, cmd_length));
}
else
{
linker_errors.Add(ErrorHelper.CreateError(5222, wex, Errors.MX5222, wex.Message));
}
}
ErrorHelper.Show(linker_errors);
// 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 (CompilerFlags.WeakFrameworks.Count > 0)
{
Target.AdjustDylibs(OutputFile);
}
Driver.Watch("Native Link", 1);
}