From 46bef40bc6e6ffc88df7d8c4af542c1075e492ed Mon Sep 17 00:00:00 2001
From: Moses Narrow <36607567+0pcom@users.noreply.github.com>
Date: Thu, 13 Aug 2026 20:26:19 -0500
Subject: [PATCH] runtime: add MemStats.NumGC for API compatibility

TinyGo's GC does not count cycles, so this stays 0 and says so. It exists
because reading runtime.MemStats.NumGC is common enough in dependency
code that its absence is a compile error for programs that never look at
the value.
---
 src/runtime/mstats.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/runtime/mstats.go b/src/runtime/mstats.go
index 987e17c30c..d6395cbf90 100644
--- a/src/runtime/mstats.go
+++ b/src/runtime/mstats.go
@@ -82,4 +82,10 @@ type MemStats struct {
 
 	// GCSys is bytes of memory in garbage collection metadata.
 	GCSys uint64
+
+	// NumGC is the number of completed GC cycles.
+	//
+	// TinyGo does not track GC cycle counts; present for API compatibility so
+	// callers that read runtime.MemStats.NumGC compile (it stays 0).
+	NumGC uint32
 }