From f669af3a5cfbc5ce48df04f9be3da2b49a2d9862 Mon Sep 17 00:00:00 2001
From: R-Goc <ryszardgoc@gmail.com>
Date: Thu, 29 May 2025 00:04:33 -0600
Subject: [PATCH] LibGC: Add the minimum export macros required to link LibJS

This approach still requires the WINDOWS_EXPORT_ALL_SYMBOLS target
property, but it does let us run a lot more tests than before.
---
 Libraries/LibGC/CMakeLists.txt | 4 ++++
 Libraries/LibGC/Internals.h    | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Libraries/LibGC/CMakeLists.txt b/Libraries/LibGC/CMakeLists.txt
index ee3201d9c61..eca1f64f1f6 100644
--- a/Libraries/LibGC/CMakeLists.txt
+++ b/Libraries/LibGC/CMakeLists.txt
@@ -23,3 +23,7 @@ if (ENABLE_SWIFT)
     target_link_libraries(LibGC PRIVATE AK)
     add_swift_target_properties(LibGC LAGOM_LIBRARIES AK)
 endif()
+
+# TODO: Use lagom_generate_export_header and annotate entire LibGC with export macros
+include(GenerateExportHeader)
+generate_export_header(LibGC EXPORT_MACRO_NAME GC_API EXPORT_FILE_NAME "Export.h")
diff --git a/Libraries/LibGC/Internals.h b/Libraries/LibGC/Internals.h
index 234c33baf40..a6327491a6f 100644
--- a/Libraries/LibGC/Internals.h
+++ b/Libraries/LibGC/Internals.h
@@ -8,6 +8,7 @@
 #pragma once
 
 #include <AK/Types.h>
+#include <LibGC/Export.h>
 #include <LibGC/Forward.h>
 
 namespace GC {
@@ -33,7 +34,7 @@ class HeapBlockBase {
     AK_MAKE_NONCOPYABLE(HeapBlockBase);
 
 public:
-    static size_t block_size;
+    GC_API static size_t block_size;
     static HeapBlockBase* from_cell(Cell const* cell)
     {
         return reinterpret_cast<HeapBlockBase*>(bit_cast<FlatPtr>(cell) & ~(HeapBlockBase::block_size - 1));