From 090c5cd83b75f5de460d8d90707207f57f977f72 Mon Sep 17 00:00:00 2001
From: Christian Flach <cmfcmf.flach@gmail.com>
Date: Mon, 8 Mar 2021 19:21:36 +0100
Subject: [PATCH] pio: Add 'pragma once' to generated header files (#237)

We can't really use traditional include guards, because the header file may be piped to stdout (which means we might not have a file name).
---
 tools/pioasm/c_sdk_output.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/pioasm/c_sdk_output.cpp b/tools/pioasm/c_sdk_output.cpp
index 9e2dc22..9388c0d 100644
--- a/tools/pioasm/c_sdk_output.cpp
+++ b/tools/pioasm/c_sdk_output.cpp
@@ -68,6 +68,8 @@ struct c_sdk_output : public output_format {
 
         header(out, "This file is autogenerated by pioasm; do not edit!");
 
+        fprintf(out, "#pragma once\n");
+        fprintf(out, "\n");
         fprintf(out, "#if !PICO_NO_HARDWARE\n");
         fprintf(out, "#include \"hardware/pio.h\"\n");
         fprintf(out, "#endif\n");