From 2ebdd72487a96879b3f8689e0b35ae5f7a49973a Mon Sep 17 00:00:00 2001
From: Tiago Medicci Serrano <tiago.medicci@espressif.com>
Date: Wed, 29 Jan 2025 18:13:02 -0300
Subject: [PATCH] include/stdlib.h: define system()'s prototype for the flat
 build

The `$(APPDIR)` folder is added to the `$(KERNDEPDIRS)` when
`CONFIG_BUILD_KERNEL=y`. The `depend` phase iterates over the
`$(KERNDEPDIRS)` folders and executes the `depend` recipe of these
folders (including the apps' recipes) with the `__KERNEL__` macro
defined, which prevents `system()`'s prototype from being declared.
---
 include/stdlib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/stdlib.h b/include/stdlib.h
index b5a5b30285..f3ede5d9c6 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -183,7 +183,7 @@ void      _Exit(int status) noreturn_function;
  * standards compatibility.
  */
 
-#ifndef __KERNEL__
+#if !defined(__KERNEL__) || defined(CONFIG_BUILD_FLAT)
 int       system(FAR const char *cmd);
 #endif