add basic Nix flake; handle DWARFv5 in MachO; misc fixes for MachO as Go linker

.envrc

@@ -0,0 +1,5 @@
+# If we are a computer with nix-shell available, then use that to setup
+# the build environment with exactly what we need.
+if has nix; then
+  use nix
+fi

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: mlugg/setup-zig@v1
       with:
-        version: master
+        version: 0.13.0
     - run: zig version
     - run: zig fmt --check src 
     - run: zig build test -Dhas-static -Dhas-zig -Dhas-objc-msgsend-stubs
@@ -28,7 +28,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: mlugg/setup-zig@v1
       with:
-        version: master
+        version: 0.13.0
     - uses: ilammy/msvc-dev-cmd@v1
     - run: zig version
     - run: zig fmt --check src 
@@ -41,7 +41,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: mlugg/setup-zig@v1
       with:
-        version: master
+        version: 0.13.0
     - run: sudo apt-get install -y musl-tools
     - run: zig version
     - run: CC=musl-gcc zig build test -Dhas-static -Dmusl
@@ -53,7 +53,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: mlugg/setup-zig@v1
       with:
-        version: master
+        version: 0.13.0
     - run: sudo apt-get install -y clang
     - run: zig version
     - run: CC=clang zig build test -Dhas-static -Dsystem-compiler=clang

README.md

@@ -6,7 +6,7 @@
 
 ### Building
 
-You will need latest Zig in your path. You can get nightly binaries from [here](https://ziglang.org/download/).
+You will need Zig 0.13.0 in your path. You can download it from [here](https://ziglang.org/download/).
 
 ```
 $ zig build

build.zig

@@ -155,8 +155,7 @@ const CreateSymlinksStep = struct {
         return self;
     }
 
-    fn make(step: *std.Build.Step, options: std.Build.Step.MakeOptions) anyerror!void {
-        const prog_node = options.progress_node;
+    fn make(step: *std.Build.Step, prog_node: std.Progress.Node) anyerror!void {
         const self: *CreateSymlinksStep = @fieldParentPtr("step", step);
         const install_path = self.install.artifact.getEmittedBin().getPath(self.builder);
         const rel_source = fs.path.basename(install_path);

build.zig.zon

@@ -4,12 +4,12 @@
 
     .dependencies = .{
         .@"zig-yaml" = .{
-            .url = "https://github.com/kubkon/zig-yaml/archive/a551d00ab041f4799420ab224cdc3efdf978092c.tar.gz",
-            .hash = "12208398e1393f83a39d03f3ef4893607650b6227dc7f1eee3db4d163fbc2c0c37ca",
+            .url = "https://github.com/kubkon/zig-yaml/archive/325dbdd276604dccf184c32fef9600b0ac48343d.tar.gz",
+            .hash = "1220e8870ca83e47b98807e89b5b636072413f6c09f9b26037e4c98c55e4960ac55a",
         },
         .@"zig-dis-x86_64" = .{
-            .url = "https://github.com/kubkon/zig-dis-x86_64/archive/53b2e2dae9e824d7b4994e767c2cbb4f39e443a9.tar.gz",
-            .hash = "1220f2b9588352067d5b6f3b68d5461cea52f4425c9144f6757db775cf2f19cb5d26",
+            .url = "https://github.com/kubkon/zig-dis-x86_64/archive/5203b9affc5045e000ae7963d988e155e98e396d.tar.gz",
+            .hash = "12207252f0592e53e8794d5a41409791d5c8c70e0de67bfba48844406619847cc971",
         },
     },