From 105a75b92cab324da1fe3a14fb9c12587ef6f4a8 Mon Sep 17 00:00:00 2001
From: Andrew Leech <andrew.leech@planetinnovation.com.au>
Date: Wed, 22 Apr 2026 10:47:59 +1000
Subject: [PATCH] py/mkrules.mk: Allow PROG to be set on the command line for
 .exe targets.

When PROG is provided on the make command line (e.g. PROG=pydfu), the
existing .exe-suffix rule for mingw targets has no effect because
command-line variables override Makefile assignments. Use 'override' so
the .exe suffix is still applied in this case.

Without this, mingw builds invoked with PROG=foo produce 'foo' but the
build rules still expect 'foo.exe', leading to spurious rebuilds and
missing artifacts.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
---
 py/mkrules.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/py/mkrules.mk b/py/mkrules.mk
index 6ac731b368b07..5b7520a1d3b26 100644
--- a/py/mkrules.mk
+++ b/py/mkrules.mk
@@ -250,7 +250,7 @@ ifneq ($(PROG),)
 # Windows, i.e. msvc or mingw builds, but not when using msys or cygwin's gcc.
 COMPILER_TARGET := $(shell $(CC) -dumpmachine)
 ifneq (,$(findstring mingw,$(COMPILER_TARGET)))
-PROG := $(PROG).exe
+override PROG := $(PROG).exe
 endif
 
 all: $(BUILD)/$(PROG)