From 72c46adccc9f50eb72d8abee6dcc22357f363f23 Mon Sep 17 00:00:00 2001
From: Philippe Marguinaud <philippe.marguinaud@meteo.fr>
Date: Mon, 27 May 2024 18:07:46 +0000
Subject: [PATCH] Detect backtrace (execinfo.h) with check_symbol_exists

---
 CMakeLists.txt    | 6 ++++++
 field_backtrace.c | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b7f28fe..fabee45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -108,6 +108,8 @@ ecbuild_add_option( FEATURE BUDDY_MALLOC
     DEFAULT ON
 )
 
+check_symbol_exists(backtrace execinfo.h HAVE_BACKTRACE)
+
 ## fypp preprocessor flags
 if(HAVE_BUDDY_MALLOC)
   list( APPEND fypp_defines "-DUSE_BUDDY_MALLOC")
@@ -174,6 +176,10 @@ foreach(prec ${precisions})
                               INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${LIBNAME}_${prec}> 
                             )
 
+  if( HAVE_BACKTRACE )
+      target_compile_definitions( ${LIBNAME}_${prec} PRIVATE HAVE_BACKTRACE )
+  endif()
+  
   if( prec MATCHES sp )
       target_compile_definitions( ${LIBNAME}_${prec} PRIVATE PARKIND1_SINGLE )
   endif()
diff --git a/field_backtrace.c b/field_backtrace.c
index 5b8037d..cbd9356 100644
--- a/field_backtrace.c
+++ b/field_backtrace.c
@@ -1,5 +1,6 @@
 #include <string.h>
 
+#ifdef HAVE_BACKTRACE
 
 #include <execinfo.h>
 #include <stdio.h>
@@ -26,7 +27,7 @@ void field_backtrace_ (char * str, int * p1, int * p2, int * plen)
 }
 
 
-#ifdef UNDEF
+#else
 
 void field_backtrace_ (char * str, int * p1, int * p2, int * plen)
 {