update Emscripten SDK to 3.1.61

CHANGELOG.md

@@ -4,6 +4,14 @@
 to the example code or the supported Zig version. For actual Sokol header changes, see the
 [sokol changelog](https://github.com/floooh/sokol/blob/master/CHANGELOG.md).
 
+### 03-Jun-2024
+
+- the Emscripten SDK dependency has been updated to 3.1.61
+- the Emscripten specific parts of build.zig have been updated to be more
+  'idiomatic' now. This also has the nice side effect that the dirty check for
+  the Emscripten linker step now works as expected (e.g. the step will do
+  nothing if the output is uptodate)
+
 ### 01-Jun-2024
 
 - added bindings for sokol_imgui.h (please read the section `## Dear ImGui support`

README.md

@@ -48,7 +48,7 @@ zig build run-debugtext-userfont
 zig build run-shapes
 ```
 
-(also run ```zig build --help``` to inspect the build targets)
+(also run ```zig build -l``` to get a list of build targets)
 
 By default, the backend 3D API will be selected based on the target platform:
 

build.zig

@@ -416,6 +416,9 @@ fn createEmsdkStep(b: *Build, emsdk: *Build.Dependency) *Build.Step.Run {
 // NOTE 2: the file exists check is a bit hacky, it would be cleaner
 // to build an on-the-fly helper tool which takes care of the SDK
 // setup and just does nothing if it already happened
+// NOTE 3: this code works just fine when the SDK version is updated in build.zig.zon
+// since this will be cloned into a new zig cache directory which doesn't have
+// an .emscripten file yet until the one-time setup.
 fn emSdkSetupStep(b: *Build, emsdk: *Build.Dependency) !?*Build.Step.Run {
     const dot_emsc_path = emSdkLazyPath(b, emsdk, &.{".emscripten"}).getPath(b);
     const dot_emsc_exists = !std.meta.isError(std.fs.accessAbsolute(dot_emsc_path, .{}));

build.zig.zon

@@ -11,8 +11,8 @@
     },
     .dependencies = .{
         .emsdk = .{
-            .url = "git+https://github.com/emscripten-core/emsdk#176dec4875db4d74c2038d7e8af3395be38d222c",
-            .hash = "122034cf4aca9f97fea3c34f3e9fe92e56f08e2160efe3c95d7ec89260e621426a81",
+            .url = "git+https://github.com/emscripten-core/emsdk#3.1.61",
+            .hash = "12200ba39d83227f5de08287b043b011a2eb855cdb077f4b165edce30564ba73400e",
         },
     },
 }