all: add support for macOS to flake.nix

The Nix version of the macOS toolchain has difficulties compiling
Objective-C modules; disable modules instead of figuring out why.
It also doesn't include any frameworks automatically; add them explicitly.

While here, move suppression of OpenGL deprecation to a GL-specific
file.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/gl_macos.go

@@ -16,6 +16,9 @@ import (
 )
 
 /*
+#cgo CFLAGS: -DGL_SILENCE_DEPRECATION -xobjective-c -fobjc-arc
+#cgo LDFLAGS: -framework OpenGL
+
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreGraphics/CoreGraphics.h>
 #include <AppKit/AppKit.h>

app/gl_macos.m

@@ -2,8 +2,7 @@
 
 // +build darwin,!ios,nometal
 
-@import AppKit;
-
+#import <AppKit/AppKit.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <OpenGL/OpenGL.h>
 #include "_cgo_export.h"

app/metal_darwin.go

@@ -12,10 +12,11 @@ import (
 )
 
 /*
-#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
+#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
+#cgo LDFLAGS: -framework QuartzCore -framework Metal
 
-@import Metal;
-@import QuartzCore.CAMetalLayer;
+#import <Metal/Metal.h>
+#import <QuartzCore/CAMetalLayer.h>
 
 #include <CoreFoundation/CoreFoundation.h>
 

app/metal_macos.go

@@ -6,12 +6,10 @@
 package app
 
 /*
-#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
-
-@import AppKit;
-
-@import QuartzCore.CAMetalLayer;
+#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
 
+#import <AppKit/AppKit.h>
+#import <QuartzCore/CAMetalLayer.h>
 #include <CoreFoundation/CoreFoundation.h>
 
 CALayer *gio_layerFactory(void) {

app/os_darwin.m

@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-@import Dispatch;
-@import Foundation;
+#import <Dispatch/Dispatch.h>
+#import <Foundation/Foundation.h>
 
 #include "_cgo_export.h"
 

app/os_macos.go

@@ -24,7 +24,8 @@ import (
 )
 
 /*
-#cgo CFLAGS: -DGL_SILENCE_DEPRECATION -Werror -Wno-deprecated-declarations -fmodules -fobjc-arc -x objective-c
+#cgo CFLAGS: -Werror -Wno-deprecated-declarations -fobjc-arc -x objective-c
+#cgo LDFLAGS: -framework AppKit -framework QuartzCore
 
 #include <AppKit/AppKit.h>
 

app/os_macos.m

@@ -2,7 +2,7 @@
 
 // +build darwin,!ios
 
-@import AppKit;
+#import <AppKit/AppKit.h>
 
 #include "_cgo_export.h"