From 384f8f687002f9f02231e54befe9245f209818cb Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Wed, 15 Apr 2026 16:08:58 -1000
Subject: [PATCH] libretiny: derive nm from CC path when $NM is unset

---
 esphome/components/libretiny/patch_linker.py.script | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/esphome/components/libretiny/patch_linker.py.script b/esphome/components/libretiny/patch_linker.py.script
index 0be4df0a33..183759559a 100644
--- a/esphome/components/libretiny/patch_linker.py.script
+++ b/esphome/components/libretiny/patch_linker.py.script
@@ -114,7 +114,11 @@ def _post_link(target, source, env):
     elf = env.subst("$BUILD_DIR/${PROGNAME}.elf")
     if not os.path.isfile(elf):
         return
-    nm = env.subst("$NM") or env.subst("${TOOLCHAIN_PREFIX}nm")
+    # $NM may be unset; derive from $CC (e.g. arm-none-eabi-gcc -> arm-none-eabi-nm).
+    nm = env.subst("$NM")
+    if not nm:
+        cc = env.subst("$CC")
+        nm = cc.replace("-gcc", "-nm") if cc.endswith("-gcc") else "nm"
     try:
         out = subprocess.check_output(
             [nm, "--defined-only", "--demangle", elf], text=True