Link a default for the embedded-assets prepare hook

packages/geastack-windows/targets/win32/main/win32_hook_defaults.cpp

@@ -9,12 +9,13 @@
 // only while the symbol has no definition. A program's definition (weak or
 // not) or an app's replaces the default; two strong definitions remain a
 // duplicate-symbol error.
-#include <cstddef>
-
 extern "C" void gea_win32_default_cycle_collection_defer() {}
 
 extern "C" bool gea_win32_default_embedded_asset_lookup(const char *, const unsigned char **, unsigned long *) { return false; }
 
+extern "C" bool gea_win32_default_embedded_assets_prepare() { return true; }
+
 #pragma comment(linker, "/alternatename:gea_cycle_collection_defer_begin=gea_win32_default_cycle_collection_defer")
 #pragma comment(linker, "/alternatename:gea_cycle_collection_defer_end=gea_win32_default_cycle_collection_defer")
 #pragma comment(linker, "/alternatename:gea_embedded_asset_lookup=gea_win32_default_embedded_asset_lookup")
+#pragma comment(linker, "/alternatename:gea_embedded_assets_prepare=gea_win32_default_embedded_assets_prepare")

packages/geastack-windows/targets/win32/test/fixtures/hook-defaults/app_duplicate.cpp

@@ -1,2 +1,3 @@
 // A second, different strong definition of the same hook: a genuine duplicate.
 extern "C" bool gea_embedded_asset_lookup(const char *, const unsigned char **, unsigned long *length) { *length = 43; return true; }
+extern "C" bool gea_embedded_assets_prepare() { return true; }

packages/geastack-windows/targets/win32/test/fixtures/hook-defaults/app_override.cpp

@@ -1,2 +1,3 @@
 // An app's own definition of a hook.
 extern "C" bool gea_embedded_asset_lookup(const char *, const unsigned char **, unsigned long *length) { *length = 42; return true; }
+extern "C" bool gea_embedded_assets_prepare() { return true; }

packages/geastack-windows/targets/win32/test/fixtures/hook-defaults/bundle_prepare.cpp

@@ -0,0 +1,2 @@
+// Stands in for the generated assets unit of an app with file-backed assets: a strong prepare hook.
+extern "C" bool gea_embedded_assets_prepare() { return true; }

packages/geastack-windows/targets/win32/test/fixtures/hook-defaults/framework.cpp

@@ -2,9 +2,11 @@
 #include <cstdio>
 extern "C" void gea_cycle_collection_defer_begin();
 extern "C" bool gea_embedded_asset_lookup(const char *path, const unsigned char **data, unsigned long *length);
+extern "C" bool gea_embedded_assets_prepare();
 int main()
 {
 	gea_cycle_collection_defer_begin();
+	std::printf("prepare %d\n", gea_embedded_assets_prepare() ? 1 : 0);
 	const unsigned char *data = nullptr;
 	unsigned long length = 0;
 	const bool found = gea_embedded_asset_lookup("a.png", &data, &length);

packages/geastack-windows/targets/win32/test/fixtures/hook-defaults/program.cpp

@@ -2,3 +2,4 @@
 #include <cstdio>
 extern "C" __attribute__((weak)) void gea_cycle_collection_defer_begin() { std::printf("program defer\n"); }
 extern "C" __attribute__((weak)) bool gea_embedded_asset_lookup(const char *, const unsigned char **, unsigned long *length) { *length = 7; return true; }
+extern "C" __attribute__((weak)) bool gea_embedded_assets_prepare() { return false; }

packages/geastack-windows/targets/win32/test/hook-defaults.test.mjs

@@ -43,7 +43,7 @@ test('linked hook defaults yield to program and app definitions, and duplicates
     return file
   }
   const defaults = object(path.join(targetDir, 'main', 'win32_hook_defaults.cpp'))
-  const [framework, program, override, duplicate] = ['framework', 'program', 'app_override', 'app_duplicate'].map((name) => object(path.join(fixtures, `${name}.cpp`)))
+  const [framework, program, bundle, override, duplicate] = ['framework', 'program', 'bundle_prepare', 'app_override', 'app_duplicate'].map((name) => object(path.join(fixtures, `${name}.cpp`)))
   const link = (name, objects) => {
     const executable = path.join(out, `${name}.exe`)
     const result = spawnSync(lldLink, ['/nologo', `/out:${executable}`, '/subsystem:console', ...objects], { encoding: 'utf8' })
@@ -52,10 +52,14 @@ test('linked hook defaults yield to program and app definitions, and duplicates
     assert.equal(run.status, 0, run.stderr)
     return { linked: true, lines: run.stdout.split(/\r?\n/).filter(Boolean) }
   }
-  assert.deepEqual(link('defaults', [framework, defaults]).lines, ['lookup 0 0'])
-  assert.deepEqual(link('program', [framework, defaults, program]).lines, ['program defer', 'lookup 1 7'])
-  assert.deepEqual(link('override', [framework, defaults, program, override]).lines, ['program defer', 'lookup 1 42'])
+  assert.deepEqual(link('defaults', [framework, defaults]).lines, ['prepare 1', 'lookup 0 0'])
+  assert.deepEqual(link('program', [framework, defaults, program]).lines, ['program defer', 'prepare 0', 'lookup 1 7'])
+  assert.deepEqual(link('bundle', [framework, defaults, program, bundle]).lines, ['program defer', 'prepare 1', 'lookup 1 7'])
+  assert.deepEqual(link('override', [framework, defaults, program, override]).lines, ['program defer', 'prepare 1', 'lookup 1 42'])
   const clash = link('duplicate', [framework, defaults, override, duplicate])
   assert.equal(clash.linked, false)
   assert.match(clash.output, /duplicate symbol: gea_embedded_asset_lookup/)
+  const prepareClash = link('prepare-duplicate', [framework, defaults, bundle, duplicate])
+  assert.equal(prepareClash.linked, false)
+  assert.match(prepareClash.output, /duplicate symbol: gea_embedded_assets_prepare/)
 })