support 32bit architectures (#10)

* fix compile error for 32bit arches
* ci: build and test 32bit executables

Author: rdunnington

.github/workflows/ci.yml

@@ -7,14 +7,35 @@ on:
   pull_request:
 
 jobs:
-  test:
-    strategy:
-      matrix:
-        os: [windows-latest, macos-latest, ubuntu-latest]
-    runs-on: ${{matrix.os}}
+  test-windows:
+    runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: mlugg/setup-zig@v1
         with:
           version: 0.14.0
-      - run: zig build test
+      - run: |
+          zig build test
+          zig build -Dtarget=x86-windows-gnu test
+
+  test-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: mlugg/setup-zig@v1
+        with:
+          version: 0.14.0
+        # Note that there's no testing for 32-bit on macos since offical support has been dropped
+      - run: |
+          zig build test
+
+  test-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: mlugg/setup-zig@v1
+        with:
+          version: 0.14.0
+      - run: |
+          zig build test
+          zig build -Dtarget=x86-linux-gnu test

stable_array.zig

@@ -469,7 +469,11 @@ test "huge max size" {
     const MB = KB * 1024;
     const GB = MB * 1024;
 
-    var a = StableArray(u8).init(GB * 128);
+    const MAX_MEMORY_32 = GB * 1;
+    const MAX_MEMORY_64 = GB * 128;
+    const MAX_MEMORY = if (@sizeOf(usize) < @sizeOf(u64)) MAX_MEMORY_32 else MAX_MEMORY_64;
+
+    var a = StableArray(u8).init(MAX_MEMORY);
     defer a.deinit();
 
     try a.resize(MB * 4);