From 7eb9bb0be6e9a8d205a44ac54d1c9ebf2da38041 Mon Sep 17 00:00:00 2001
From: Marco Casaroli <marco.casaroli@gmail.com>
Date: Mon, 27 Jul 2026 03:49:01 +0200
Subject: [PATCH] cmake: Omit default priority ELF symbol.

nuttx_add_application() encoded SCHED_PRIORITY_DEFAULT as a zero-valued nx_priority linker symbol. A zero priority is invalid for a runnable ELF application task.

Do not emit nx_priority for the symbolic default. When the symbol is absent, the ELF loader retains its scheduler default. Continue emitting nx_priority for explicit numeric priorities.

Companion to apache/nuttx-apps#3667.

Assisted-by: Zed:GPT-5.6 Terra

Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
---
 cmake/nuttx_add_application.cmake | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/cmake/nuttx_add_application.cmake b/cmake/nuttx_add_application.cmake
index c670bf00d54..78c27c6e2a8 100644
--- a/cmake/nuttx_add_application.cmake
+++ b/cmake/nuttx_add_application.cmake
@@ -153,10 +153,7 @@ function(nuttx_add_application)
           set(SYMBOL_STACKSIZE $<$<NOT:$<BOOL:${USE_LINKER}>>:-Wl,>--defsym
                                nx_stacksize=${STACKSIZE})
         endif()
-        if(PRIORITY)
-          if(PRIORITY STREQUAL "SCHED_PRIORITY_DEFAULT")
-            set(PRIORITY "0")
-          endif()
+        if(PRIORITY AND NOT PRIORITY STREQUAL "SCHED_PRIORITY_DEFAULT")
           set(SYMBOL_PRIORITY $<$<NOT:$<BOOL:${USE_LINKER}>>:-Wl,>--defsym
                               nx_priority=${PRIORITY})
         endif()