Update WASM-4 memory config and rocci-bird

.github/workflows/generate-docs.yaml

@@ -24,6 +24,7 @@ jobs:
         uses: roc-lang/setup-roc@main
         with:
           version: nightly-new-compiler
+          nightly-tag: nightly-2026-July-14-c9147c2
       - name: Build host object
         run: zig build
       - name: Generate docs

.github/workflows/release.yml

@@ -37,9 +37,10 @@ jobs:
           version: ${{ env.ZIG_VERSION }}
 
       - name: Install Roc
-        uses: roc-lang/setup-roc@v0.2.0
+        uses: roc-lang/setup-roc@main
         with:
           version: ${{ env.ROC_VERSION }}
+          nightly-tag: nightly-2026-July-14-c9147c2
 
       - name: Capture Roc version
         id: roc_version
@@ -55,7 +56,7 @@ jobs:
           } >> "$GITHUB_OUTPUT"
 
       - name: Build host object
-        run: zig build -Doptimize=ReleaseSafe
+        run: zig build -Doptimize=ReleaseSmall
 
       - name: Bundle platform
         id: bundle
@@ -118,9 +119,10 @@ jobs:
           version: ${{ env.ZIG_VERSION }}
 
       - name: Install Roc
-        uses: roc-lang/setup-roc@v0.2.0
+        uses: roc-lang/setup-roc@main
         with:
           version: ${{ env.ROC_VERSION }}
+          nightly-tag: nightly-2026-July-14-c9147c2
 
       - name: Install Python
         uses: actions/setup-python@v5

.github/workflows/tests.yaml

@@ -25,6 +25,7 @@ jobs:
         uses: roc-lang/setup-roc@main
         with:
           version: nightly-new-compiler
+          nightly-tag: nightly-2026-July-14-c9147c2
 
       - run: roc version
 

CONTRIBUTING.md

@@ -84,7 +84,7 @@ If hot reloading stops working, press `R` in the WASM-4 runtime to reload the ca
 Package the platform as a Roc archive with:
 
 ```shell
-zig build -Doptimize=ReleaseSafe
+zig build -Doptimize=ReleaseSmall
 ROC=roc ./bundle.sh
 ```
 
@@ -114,4 +114,4 @@ zig build -Doptimize=ReleaseSmall
 roc build examples/snake.roc --opt=size
 ```
 
-If the cart is too large, you can try lowering the dynamic memory space with `-Dmem-size=<bytes>`. The default is `40960` bytes.
+If the cart is too large, you can try lowering the dynamic memory space with `-Dmem-size=<bytes>`. The default is `32768` bytes.

build.zig

@@ -15,13 +15,14 @@ pub fn build(b: *std.Build) void {
     // Build options exposed as the `config` module to allocator.zig / host.zig.
     // ---------------------------------------------------------------------
 
-    // Full mem size on WASM-4 is 58976, but we have to leave room for code + constants.
-    // Was u16 in the old build; widened to u32 for headroom.
+    // WASM-4 gives programs 58976 bytes after its reserved hardware range. The
+    // final module also needs room there for stack and Roc static data, so the
+    // default allocator arena intentionally leaves several KiB free.
     const mem_size = b.option(
         u32,
         "mem-size",
         "the amount of space reserved for dynamic memory allocation",
-    ) orelse 40960;
+    ) orelse 32768;
 
     // Enable this if you hit any sort of memory corruption. Costs performance.
     const zero_on_alloc = b.option(

ci/all_tests.sh

@@ -39,7 +39,7 @@ echo "Zig: $(zig version)"
 if [ "$SKIP_ZIG_BUILD" = "1" ]; then
     echo "Skipping zig build because SKIP_ZIG_BUILD=1"
 else
-    zig build
+    zig build -Doptimize=ReleaseSmall
 fi
 
 # zig tests

examples/basic.roc

@@ -1,4 +1,4 @@
-app [main] { w4: platform "https://github.com/lukewilliamboswell/roc-wasm4/releases/download/0.6/ADeKYHzDvyXSEZjj4wG3qRLTFRYiiEWLuVMPD5S8uBF3.tar.zst" }
+app [main] { w4: platform "../platform/main.roc" }
 
 import w4.W4
 

examples/rocci-bird-rust/.cargo/config.toml

@@ -0,0 +1,14 @@
+[build]
+target = "wasm32-unknown-unknown"
+
+[target.wasm32-unknown-unknown]
+rustflags = [
+    "-C", "link-arg=--import-memory",
+    "-C", "link-arg=--initial-memory=65536",
+    "-C", "link-arg=--max-memory=65536",
+    "-C", "link-arg=--allow-undefined",
+    "-C", "link-arg=--no-stack-first",
+    "-C", "link-arg=--global-base=6592",
+    "-C", "link-arg=-z",
+    "-C", "link-arg=stack-size=14752",
+]

examples/rocci-bird-rust/.gitignore

@@ -0,0 +1 @@
+/target

examples/rocci-bird-rust/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "rocci-bird-rust"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[profile.release]
+opt-level = "z"
+lto = true
+codegen-units = 1
+panic = "abort"
+strip = true