wasm-linker: Only export symbols notated as such

This exposes a function from stage2 to stage1 to append symbols to automatically export them.

This happends under the following conditions:
- Target is wasm
- User has not provided --export/--rdynamic flags themselves.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/Compilation.zig b/src/Compilation.zig
index 40aabcae36..cca07c2a34 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -165,6 +165,10 @@ emit_docs: ?EmitLoc,
 work_queue_wait_group: WaitGroup,
 astgen_wait_group: WaitGroup,
 
+/// Exported symbol names. This is only for when the target is wasm.
+/// TODO: Remove this when Stage2 becomes the default compiler as it will already have this information.
+export_symbol_names: std.ArrayListUnmanaged([]const u8) = .{},
+
 pub const SemaError = Module.SemaError;
 
 pub const CRTFile = struct {
@@ -1877,6 +1881,11 @@ pub fn destroy(self: *Compilation) void {
     self.work_queue_wait_group.deinit();
     self.astgen_wait_group.deinit();
 
+    for (self.export_symbol_names.items) |symbol_name| {
+        self.gpa.free(symbol_name);
+    }
+    self.export_symbol_names.deinit(self.gpa);
+
     // This destroys `self`.
     self.arena_state.promote(gpa).deinit();
 }