Bug 15444 – [Interfacing to Objective-C]

When I run the code at the bottom of this page on OSX El Capitan with the compiler flag options specified, I get the following errors and cannot proceed: $ dmd -L-framework -LFoundation test.d test.d(6): Error: undefined identifier 'selector' test.d(12): Error: undefined identifier 'selector' test.d(13): Error: undefined identifier 'selector' Evidently it really doesn't like 'selector'. Here's the version of DMD I'm running, which I got from Homebrew: $ dmd --version DMD64 D Compiler v2.069 Copyright (c) 1999-2015 by Digital Mars written by Walter Bright

I added the code below for reference. It works perfectly fine for me using Yosemite. It's most likely an issue with the installation of the compiler. // test.d module main; extern (Objective-C) interface Class { NSString alloc() @selector("alloc"); } extern (Objective-C) interface NSString { NSString initWithUTF8String(in char* str) @selector("initWithUTF8String:"); void release() @selector("release"); } extern (C) void NSLog(NSString, ...); extern (C) Class objc_lookUpClass(in char* name); void main() { auto cls = objc_lookUpClass("NSString"); auto str = cls.alloc().initWithUTF8String("Hello World!"); NSLog(str); str.release(); }

Here's the fix. It has to do with El Capitan and brew. I found the fix: $ sudo brew update $ sudo brew uninstall --force dmd $ sudo su $ cd /Library $ rm -rfd D $ exit $ sudo brew install dmd This not only takes one from an older dmd to a more current version (in my case, from 2.068 to 2.069), but it also fixes a bug where /Library/D doesn't get updated. (Besides, the El Capitan version of 2.069 now doesn't use /Library/D.) When I did that, I found I was able to compile like so: volomike:cpptod4 mike$ dmd -m64 -L-framework -LFoundation test.d volomike:cpptod4 mike$ ls test test.d test.o volomike:cpptod4 mike$ ./test 2015-12-15 03:07:52.669 test[7308:116958] Hello World! volomike:cpptod4 mike$ So, it not only used an Objective C NSString object, but it fed it to NSLog and I got console output in NSLog format.

Changing from FIXED to WORKSFORME since this was apparently an installation problem.