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Re: libdispatch types in a property declaration


From: Simon Gornall
Subject: Re: libdispatch types in a property declaration
Date: Thu, 23 May 2019 08:47:28 -0700



On 23 May 2019, at 08:15, David Chisnall <address@hidden> wrote:

Hi,

I'd not looked at the Swift corelibs version of libdispatch.  Looking at its headers, there are some feature test macros that check if you have Objective-C support, which seem to only enable Objective-C interop on Apple platforms:

https://github.com/apple/swift-corelibs-libdispatch/blob/631821c2bfcf296995a8424f148a9365470c2210/os/object.h#L58

You could add some checks to there to enable them on non-Mac platforms and see what happens when you build them…

Good idea :) 

Defining -DOS_OBJECT_HAVE_OBJC_SUPPORT=1 in the ${TOOL_NAME}_CPPFLAGS variable in GNUmakefile successfully navigated that set of tests, and then it fell over because dispatch.h #includes <objc/NSObject.h> rather than <Foundation/NSObject.h>. A symlink fixed that :)

So now Server.m compiles. There’s still quite a long way to go to see if it works, apparently we don’t have NS{Mutable}OrderedSet in GNUstep just yet, so I’ll mock one up with an NS{Mutable}Array and an NS{Mutable}Set and see where it barfs next :)

The board that’s running all this is one of these - I still find it kind of amazing that something this small can run “Cocoa” apps :)

Cheers!
Simon



David

On 23/05/2019 15:13, Simon Gornall wrote:
[I posted this in gnu.gnustep.discuss, but then realised that the last post before mine was back in January. Posting here where there’s more traffic :)]
Hi all,
So I've just installed Debian (Sid) and got GNUstep installed with runtime 2.0 / clang-8 etc. by following http://wiki.gnustep.org/index.php/Building_GNUstep_under_Debian_FreeBSD#libdispatch <http://wiki.gnustep.org/index.php/Building_GNUstep_under_Debian_FreeBSD#libdispatch> As far as I can tell, it all worked fine. I got a few tests fail where the above link didn't mention, but they seemed to be to do with Objc++, and I'm not planning on using that. I put that down to running sid.
I have a project that compiles on my Mac, and I'm trying to port it over - part of it is a web-socket service, which uses libdispatch and blocks to process the data streams. On the Mac, there aren't any warnings. On the linux box, I get:
nano:~/src/b-leet.com/bleetd <http://b-leet.com/bleetd>> make messages=yes
This is gnustep-make 2.7.0. Type 'make print-gnustep-make-help' for help.
Running in gnustep-make version 2 strict mode.
Making all for tool bleetd...
/usr/bin/clang-8 bleetd/classes/server/Server.m -c \
      -MMD -MP -Ibleetd/classes/server -Ibleetd/classes/websockets -DGNUSTEP -DGNUSTEP_BASE_LIBRARY=1 -DGNU_GUI_LIBRARY=1 -DGNUSTEP_RUNTIME=1 -D_NONFRAGILE_ABI=1 -DGNUSTEP_BASE_LIBRARY=1 -fno-strict-aliasing -fexceptions -fobjc-exceptions -D_NATIVE_OBJC_EXCEPTIONS -pthread -fPIC -Wall -DGSWARN -DGSDIAGNOSE -Wno-import -g -O2 -fblocks -fobjc-runtime=gnustep-2.0 -fblocks -fconstant-string-class=NSConstantString -I. -I/home/simon/GNUstep/Library/Headers -I/usr/local/include \
       -o obj/bleetd.obj/bleetd/classes/server/Server.m.o
In file included from bleetd/classes/server/Server.m:10:
In file included from bleetd/classes/websockets/PSWebSocketServer.h:16:
bleetd/classes/websockets/PSWebSocket.h:69:1: error: property with 'retain (or strong)' attribute must be of object type
@property (nonatomic, strong) dispatch_queue_t delegateQueue;
^
In file included from bleetd/classes/server/Server.m:10:
bleetd/classes/websockets/PSWebSocketServer.h:47:1: error: property with 'retain (or strong)' attribute must be of object type
@property (nonatomic, strong) dispatch_queue_t delegateQueue;
^
2 errors generated.
The GNUmakefile I put together looks like:
---8<------8<------8<---  Cut Here  ---8<------8<------8<---
include $(GNUSTEP_MAKEFILES)/common.make
TOOL_NAME = bleetd
bleetd_CPPFLAGS         = -Ibleetd/classes/server \
            -Ibleetd/classes/websockets
bleetd_OBJC_FILES         = $(shell find bleetd -name '*.m')
include $(GNUSTEP_MAKEFILES)/tool.make
---8<------8<------8<---  Cut Here  ---8<------8<------8<---
So the question: Would I normally expect a 'dispatch_queue_t' to still be something that can be put into a property in GNUstep ? I'm really only familiar with the Mac side of things - I’m new to GNUstep, and in Mac-land they're reference-counted objects. I guess I’m asking: is this a bug, did I do something wrong during install, or is it expected behaviour ?
Cheers
   Simon
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