Some of the fixes done for the warnings have breaking changes. Move back
to int and ensure that we do not have any compilation errors (we are
using -Werror).
Fixes: https://github.com/xamarin/xamarin-macios/issues/7509
## Miscellaneous fixes
* Fixed
`/Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/builds/mono-ios-sdk-destdir/ios-sources/external/linker/src/linker/Linker.Steps/OutputStep.cs(110,15): error CS0246: The type or namespace name ‘OutputException’ could not be found (are you missing a using directive or an assembly reference?) [/Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/tools/mmp/mmp.csproj]`
* Changed the name of the method that is used from linker. Because of this commit 6be26771b9
* Added `OutputException.cs` file on `mtouch.csproj`.
* Removing enter_gc_safe and exit_gc_safe because now it's already gc_safe in this part of code, after a mono change.
* Added known exceptions to LLVM exception list.
* Needs `ifdef` because of this https://github.com/mono/mono/pull/17260.
* Bump MIN_MONO_VERSION to 6.8.0.41 and point MIN_MONO_URL to the PR.
* Add ENABLE_IOS=1 and ENABLE_MAC=1.
* Added switch to disable packaged mono build
* [Tests] Ignore tests that fail on 32b.
Ignore the test on 32b, and filled issue: https://github.com/mono/mono/issues/17752
* [Tests] Ignore a couple of tests causing OOM.
Hopefully fixes https://github.com/xamarin/maccore/issues/1659 for good.
* Ignore `MM0135` test on Catalina+ because it needs Xcode 9.4.
* [monotouch-test] Add null checks for teardown when test didn't run because of a too early OS version.
* [CFNetwork]: Http 2.0 requires OS X 10.11 or later.
Check whether `_HTTPVersion2_0` is available and fallback to HTTP 1.1 otherwise.
## Bring HttpClient from CoreFX
* #7346
* This bumps Mono to use https://github.com/mono/mono/pull/17645 (which is the 2019-10 backport
of https://github.com/mono/mono/pull/17628).
* The big user-visible change is in regards to certificate validation, everything below are just
some minor adjustments to tests.
### SocketsHttpHandler
CoreFX uses a completely new `HttpClientHandler` implementation called `SocketsHttpHandler`,
which you can find at https://github.com/dotnet/corefx/tree/release/3.0/src/System.Net.Http/src/System/Net/Http/SocketsHttpHandler.
Since this is not based on the web stack anymore, it does not use any of the related APIs such
as `ServicePointManager` or `WebException`.
### Certificate Validation Changes
There is a new API called `HttpClientHandler.ServerCertificateCustomValidationCallback`.
- https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httpclienthandler.servercertificatecustomvalidationcallback?view=netframework-4.8
- c1778515a3/src/System.Net.Http/src/System/Net/Http/HttpClientHandler.Unix.cs (L154)
- c1778515a3/src/System.Net.Http/src/System/Net/Http/HttpClientHandler.Windows.cs (L383)
The `ServicePointManager.ServerCertificateValidationCallback` is no longer invoked and on
certificate validation failure, `AuthenticationException` (from `System.Security.Authentication`)
is thrown instead of `WebException`.
At the moment, the `NSUrlSessionHandler` still uses it's own validation callback and also still
throws `WebException` on failure; we should probably look into making this consistent with the
other handlers.
### Minor adjustments related to internal Mono APIs
* `HttpContent.SerializeToStreamAsync()` is now `protected` (changed from `protected internal`).
- src/Foundation/NSUrlSessionHandler.cs: changed overload accordingly.
- src/System.Net.Http/CFContentStream.cs: likewise.
* `HttpHeaders.GetKnownHeaderKind()` is an internal Mono API.
There is a new internal API called `System.Net.Http.PlatformHelper.IsContentHeader(key)`
which exists in both the old as well as the new implementation.
The correct way of doing it with the CoreFX handler is
`HeaderDescriptor.TryGet (key, out var descriptor) && descriptor.HeaderType == HttpHeaderType.Content`
### Minor adjustments to tests.
* `HttpClientHandler.MaxRequestContentBufferSize` is now longer supported, you can set it to
any non-negative value, the getter will always return 0.
See c1778515a3/src/System.Net.Http/src/System/Net/Http/HttpClientHandler.Core.cs (L18).
- tests/linker/ios/link sdk/HttpClientHandlerTest.cs: removed assertion from test.
* `HttpMessageInvoker.handler` is a `protected private` field - in the CoreFX handler, it is
called `_handler` and `private`. This is accessed via reflection by some of the tests, which are
now using the new name.
- tests/mmptest/src/MMPTest.cs: here
- tests/mtouch/MTouch.cs: here
* tests/monotouch-test/System.Net.Http/MessageHandlers.cs:
Adjust `RejectSslCertificatesServicePointManager` to reflect the certificate validation
changes described above.
- FIXME: There was an `Assert.Ignore()` related to `NSUrlSessionHandler` and macOS 10.10;
I removed that to reenable the test because the description linked to an old issue in
the private repo that was referenced by several "Merged" PR's, so it looked to me that
this might have already been fixed - and I also didn't see why it would fail there.
Static analysis (and any manual review) is easily confused by
`sizeof (id)`, `sizeof (self)` and `sizeof (*self)` when another
argument is `self` and can report false positives (or be missed
or misinterpreted by humans).
This simply clarify that `|` is an encoded pointer and will
be the size of the pointer (varying by architectures)
`xamarin_notify_dealloc` can throw an exception (depending on the mode
used).
Throwing exception in a destructor is problematic in [Obj]C++ and can
abort the application. That might be fine in some cases but there's
not much point in doing so when we're about to forget everything about
that specific object.
Help static analyzer by clarifying that only `char` will be given to
`isblank` so it does not look like it could be used to index an array
and gets out of bounds (important since this is user supplied values).
Digging down into `isblank` will get you to
> Using tainted variable _c as an index to array _DefaultRuneLocale.__runetype.
Change `redirect_io` to be easier to re-use correctly, i.e. returning the
file descriptor (instead of `0`).
Comment why the file descriptor are never released. It makes sense but
it's not obvious (even less in `redirect_io`) without comments.
Using static fields also makes it easier for static analysis (locals are
easier to process).
Finally reuse, mostly, the same string for the error message, i.e.
```
$ strings runtime//.libs/mac/libxammac.x86_64.dylib | grep "Could not redirect"
Xamarin.Mac: Could not redirect %s to `%s': %s
```
versus
```
$ strings runtime//.libs/mac/libxammac.x86_64.dylib | grep "Could not redirect"
Xamarin.Mac: Could not redirect stdout to `%s': %s
Xamarin.Mac: Could not redirect stderr to `%s': %s
```
* [Runtime] Enable the -Wshorten-64-to-32 flag and fix all warnings.
We want to enable the -Wconversion but that will raise too many warning
for a single commit. We are enabiling one by one the flags included in
-Wconversion so that we have smaller diffs.
-Wshorten-64-to-32 adds warnings when there is a implicit conversion that
loses integer precision. We are moving all the 32 to 64 conversions to
use 64. Expecially since most of the code changed is related with sizes,
legths and params counts that are never going to be negative.
Co-Authored-By: Rolf Bjarne Kvinge <rolf@xamarin.com>
`get_mono_env_options` allocate memory so it must [1] be freed.
[1] to be polite since it will be freed when the app exit, which
will free everything anyway
Enable the -Wsign-compare which will raise issues when a comparison
between signed and unsigned values could produce an incorrect result
and fix all the raised warnings.
* [runtime] Simplify Vision dlsym'ed functions
More code sharing - DRYer :)
It also remove complaints (from static analysis tools) that a `dlclose`
should be present. That's not really an issue here since it's reference
counted and won't be unloaded if you use the code (and such a call is
not added in the PR). It silence the warning since it's not a local
variable anymore.
`calloc` can return `null` and we're writing to the memory location
which would crash the process.
An `OutOfMemoryException` is the correct way to handle this (even if
will likely crash the process anyway).
If `old_gchandle` is not set (0) then the function returns early,
so can't be 0 after the `MONO_THREAD_ATTACH` meaning:
* the `else` branch is never executed;
* the `exception_gchandle` is never set to something other than 0
* ` if (exception_gchandle == 0) {` is always `true` and can be removed (diff looks bigger than it is because of indentation change)
= the call to `xamarin_process_managed_exception_gchandle` is unneeded
* Add xamarin_os_log function
See the comment in the function for an explanation
of why this wrapper function is required.
* Add Darwin/OSLog.cs
* Add xamarin_os_log to header
This ensures that the symbol will not be subject
to C++ name mangling, therefore breaking mmp.
With this change applied, OSLog works as expected.
* Resolve stylistic PR feedback
* Move OSLog into CoreFoundation namespace
This is where the NativeObject class lives, and it
also feels like a better fit for a low-level API
that is available on non-Mac platforms than the
macOS-only Darwin namespace.
It is the more common and optimized idiom to just substract two integer values rather than do conditional checks. This may yield better performance for the qsort function, improving a bit of the startup time in case of many items
* Use a better, non-overflowing version with bit twiddling hacks.
Credits to @mandel-macaque for the magic
This has a couple of advantages:
* It makes it easier to add a catalyst version of these libraries (because it
becomes cumbersome to build for catalyst when the build rules assumes we're
building for both simulator and device).
* It makes it easier to create an xcframework of our libraries, because the
contents in an xcframework is split like this.
Fixes these warnings:
shared.m:252:6: warning: 'OSAtomicDecrement32Barrier' is deprecated: first deprecated in watchOS 3.0 - Use std::atomic_fetch_sub() from <atomic> instead [-Wdeprecated-declarations]
if (OSAtomicDecrement32Barrier (&bl->descriptor->ref_count) == 0) {
^
/Applications/Xcode11.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS6.0.sdk/usr/include/libkern/OSAtomicDeprecated.h:201:9: note: 'OSAtomicDecrement32Barrier' has been explicitly marked deprecated here
int32_t OSAtomicDecrement32Barrier( volatile int32_t *__theValue );
^
shared.m:270:2: warning: 'OSAtomicIncrement32' is deprecated: first deprecated in watchOS 3.0 - Use std::atomic_fetch_add_explicit(std::memory_order_relaxed) from <atomic> instead [-Wdeprecated-declarations]
OSAtomicIncrement32 (&source->descriptor->ref_count);
^
/Applications/Xcode11.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS6.0.sdk/usr/include/libkern/OSAtomicDeprecated.h:171:9: note: 'OSAtomicIncrement32' has been explicitly marked deprecated here
int32_t OSAtomicIncrement32( volatile int32_t *__theValue );
^
monotouch-debug.m:309:10: warning: 'OSAtomicIncrement32Barrier' is deprecated: first deprecated in watchOS 3.0 - Use std::atomic_fetch_add() from <atomic> instead [-Wdeprecated-declarations]
int c = OSAtomicIncrement32Barrier (&http_send_counter);
^
/Applications/Xcode11.app/Contents/Developer/Platforms/WatchOS.platform/Developer/SDKs/WatchOS6.0.sdk/usr/include/libkern/OSAtomicDeprecated.h:182:9: note: 'OSAtomicIncrement32Barrier' has been explicitly marked deprecated here
int32_t OSAtomicIncrement32Barrier( volatile int32_t *__theValue );
^
* Drop the Xcode 9.4 dependency.
Also bump mono to get the removal of the mac32 binaries.
New commits in mono/mono:
* mono/mono@70d6903053 [2019-08] [merp] Use a separate program as the hang supervisor. (#16900)
* mono/mono@4bff2b6370 [offsets-tool] Install clang into the user-specific python directory.
* mono/mono@81894ec8ca Implement WriteCore and ReadCore in DeflateStream
* mono/mono@bfbf823ca1 [ci] Remove more XCODE32_DIR usages (#16964)
* mono/mono@ce01b20a4d Add net_4.8.xml to EXTRA_DIST and bump binary-reference-assemblies again
* mono/mono@7a587d7fa6 Add .NET 4.8 reference assemblies (#16912)
* mono/mono@35e454a8f6 [sdks] Remove the mac32 build. (#16936)
* mono/mono@75eb342f53 [2019-08] [System] Make FileSystemWatcher backend non-static (#16926)
* mono/mono@5881981f79 [2019-08] [mini] Add missing membars when initializing rgctx entries (#16909)
* mono/mono@6290b6cd6e Temporarily disable embedded ppdb data decompression (#16911)
* mono/mono@a0e7f9eaf2 [2019-08] [arm64_32] make "Debug Mode" work on Watch series 4 with --interpreter (#16886)
* mono/mono@6275840a7f Rename bundle identifier for the various Mono.frameworks we create for Xamarin.iOS. Fixesxamarin/xamarin-macios#7005. (#16901)
* mono/mono@25f6093283 [corlib] Fix building nunit-lite twice (#16895)
* mono/mono@7ec17ba1be [2019-08] [android sdk] Add aprofutil tool (#16884)
* mono/mono@f755f3b539 [metadata] Fix leaks when handling a few attributes (#16850)
* mono/mono@5f9a2db39b [2019-08] Fix infrequent hangs in test-runner. (#16854)
* mono/mono@f31f5ea1f1 [2019-08] [threads] do not convert NULL thread name (#16828)
* mono/mono@20308e6f87 [aot] Do not wrap tool_prefix path when calling strip (#16820)
* mono/mono@cecda47c48 [aprofutil] Add -p and -f options
* mono/mono@824cc12ac3 Bump to mono/corefx@e79cf5b
* mono/mono@b77dc06a7e [aprofutil] Install the tool correctly (#16112)
* mono/mono@1848d78d60 [aotprof-tool] Initial import of AOT profiler tool (#15384)
* mono/mono@da0086e304 [2019-08] Add RenamedEvent* to FSW sources from CoreFX (#16756)
* mono/mono@0297b21b03 [msbuild][roslyn] Bump msbuild and roslyn to pull in new versions (#16768)
* mono/mono@40631e3b9e [2019-08] [aot] move method_addresses to data.rel.so section to avoid text relocations (#16751)
* mono/mono@68b77674e2 Vtable [i] can be null so this should be check before use it. Fixes#16712
* mono/mono@4a0b4f41ed [mini] publish global patches after JitInfo has been added
* mono/mono@7a1f63fde6 [debugger][android] It was not initialising seq_points on MonoCompile on Android, so when was compiling dynamic methods, seq_points wasn't created and we got the assert when try to single step.
Diff: 29b1ac19c9..70d6903053
* [tests] Add a fat macOS dylib for testing purposes.
Add a binary version of a fat macOS dylib (because we can't create one when we
need it since we can't create 32-bit slice anymore).
It was created like this (in tests/test-libraries):
$ cat test.m
int theUltimateAnswer ()
{
return 42;
}
$ /Applications/Xcode94.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang test.m -olibtest.i386.dylib -shared -isysroot /Applications/Xcode94.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk -framework Foundation -framework CoreLocation -lz -arch i386
$ lipo -create libtest.i386.dylib .libs/macos/libtest.dylib -output libtest-fat.dylib
* [tests] Adjust XM tests to XM not having fat dylibs anymore.
* [tests] Adjust product tests to some libraries not being fat anymore.
* One more test fix.
* Add a dummy x86_64 slice to all our native libraries that don't have one. (#6848)
Apple's notarization tool has a bug where they incorrectly flag Mach-O
binaries without an x86_64 slice, so make sure all our libraries have one.
* Jenkinsfile notarization (#6869)
* Add in notarization script for xamarin.mac/xamarin.iOS
* Flatten the list to get rid of the braces
* Add in keychain password
* Add login.keychain back in to access codesigning certificates
* Always sign pkgs, upload notarized copies
* Enable ios notarization and make notarized pkgs public
* Make notarization non-fatal
* Publish GH statuses for notarized PKGs
* Don't forget to declare URI variables for notarized pkgs
* report proper package links
* [jenkins] Improve package reporting.
* Use dummy function name which our tests won't complain about.
Rename the bundle identifier for the frameworks we ship, because apparently
Apple has added an App Store check to reject apps with multiple frameworks
with the same bundle identifier.
For some reason that includes rejecting frameworks that are both in iOS and
watchOS apps. This feels like a bug on Apple's end, but we can still easily
work around it, so let's do just that.
Strictly speaking it's not necessary to change the bundle identifier for tvOS
frameworks, but it's more consistent that way.
Fixes https://github.com/xamarin/xamarin-macios/issues/6920.
Support for `NSValue`/`CGAffineTransform` exists in iOS/tvOS/watchOS,
from UIKit, but not for macOS. However this will be required for the
new protocols inside CoreImage.
Also add an overload for `StoreValueAtAddress` since the original
one was deprecated but we did not provide the new alternative to
update the code.
* Build native code with -std=c++14.
Apple's headers now require -std=c++14 to compile their headers in C++ mode.
This fixes a compile error that would occur with the PhotosUI framework when
compiling code for C++.
* [mmp] Use -std=c++14 when compiling.
* Fix command line output.
* [mmp] Add all source files at the end, so they all get the -x clang argument applied.
* Limit when using c++14 in mtouch according to language.
It's now required to cast objc_msgSend[Super] to a function of the correct
signature, so let's do that.
Also remove the define that allowed us to use the previous behavior.
Define the xamarin_timezone_get_local_name function in a header, so that we
don't get C++ mangling. Also make it return a non-const char*, since the
caller is supposed to free the returned value.
Fixes this test:
* Xamarin.Tests.Misc.PublicSymbols(iOS): Failed libraries
Expected: <empty>
But was: "/Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/MonoTouch.iphoneos.sdk/usr/lib/libxamarin-debug.a:
__Z31xamarin_timezone_get_local_namev
__Z31xamarin_timezone_get_local_namev
__Z31xamarin_timezone_get_local_namev
__Z31xamarin_timezone_get_local_namev
__Z31xamarin_timezone_get_local_namev
* Use the commonly used casing for `MSBuildSDKsPath` property
Handle "incorrectly" cased msbuild property names
msbuild property names are case insensitive. While generating the custom
app.config, in `SetToolsetProperty(..)` we try to update the property if
it already exists. But the name lookup was case sensitive, thus causing
the lookup to fail, resulting in two entries for the same property name
differing only in case. Eg. `MSBuildSDKsPath` vs `MSBuildSdksPath`.
* [mtouch] Whitelist new Brotli native symbols in Xamarin.Tests.Misc.PublicSymbols test
* [mtouch] Better assert in NoLLVMFailuresInWatchOS() test
We'd list the "LLVM failed" messages before even though the AOT might've crashed and the list is meaningless. Assert the exit code before that.
* [mtouch] Use new LLVM even for 32bit targets
See https://github.com/mono/mono/issues/14841 and https://github.com/mono/mono/issues/9621
* [mtouch] Work around slow LLVM in "don't link" test
See https://github.com/mono/mono/issues/14843
* Remove useless conditional
* Remove LLVM36 from Makefile
* [watch4] set right min version for arm64_32 based watch devices (#6307)
Fixes the confusion around `libmono-native*` (see for example ce5ba1e41d (commitcomment-33834491) ) when building with `MONO_BUILD_FROM_SOURCE=1`.
* reflect watchos64_32_version_min change from mono sdk
* Move mono hash info to mk/mono.mk so that existing scripts work.
* Add Makefile dependency on mono.mk where necessary
With 3e7bc29ade the Mono hash was moved from Make.config to mono.mk.
We need to add a Makefile dependency on this file wherever Make.config was used to track a Mono dependency.
* [tests] Copy mk/mono.mk to the XM test package.
* [tests] Update minOS version test after consolidating min watchOS versions everywhere.
Fixes this mtouch and mmptest failure:
1) Failed : Xamarin.Tests.ProductTests.MinOSVersion(watchOS,MinwatchOS,WatchOSSimulator,False)
Failures
Expected: <empty>
But was: < "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (mono-runtime-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (bindings-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (bindings-generated-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (shared-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (runtime-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (trampolines-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (trampolines-invoke-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (xamarin-support-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (nsstring-localization-debug.arm64_32.o).", "Unexpected minOS version (expected 2.0.0, alternatively 2.0.0, found 5.1.0) in /Users/builder/jenkins/workspace/xamarin-macios/xamarin-macios/_ios-build/Library/Frameworks/Xamarin.iOS.framework/Versions/git/SDKs/Xamarin.WatchSimulator.sdk/usr/lib/libxamarin-debug.a (trampolines-varargs-debug.arm64_32.o)."... >
* [mmp] Fix make clean target
It needs an -r to remove directories:
```
rm: bin: is a directory
rm: obj: is a directory
```
* Add new xamarin_timezone_get_local_name() to a few more places
This includes:
* 32-bit version of Xamarin.Mac.dll and OpenTK.dll
* XamMac.dll and XamMac.CFNetwork.dll
* 32-bit versions of the runtime libraries (libxammac.a and friends).
* 32-bit version of the partial static library for Xamarin.Mac.
* Classic support in the generator.
We still ship a few Classic files so that Visual Studio for Mac continue to detect that Xamarin.Mac is installed (otherwise VSfM won't open Classic projects, which makes it impossible to use the migration wizard).
This makes our build slightly faster.
Partial fix for #6300.
Manuel de la Pena
Marius Ungureanu
Rolf Bjarne Kvinge
Jo Shields
Sebastien Pouliot
William Kent
Bernhard Urban
Alex Soto