From d696d489378a347dd7e297ad488270ec036a3ad8 Mon Sep 17 00:00:00 2001
From: Thomas Bertels <3265870+tbertels@users.noreply.github.com>
Date: Mon, 7 Jul 2025 13:11:57 +0200
Subject: [PATCH] cmakelists: Don't check for _GNU_SOURCE on FreeBSD

Boost.Stacktrace requires _Unwind_Backtrace(), which FreeBSD support
without requiring _GNU_SOURCE to be set.

We can't use target_compile_definitions because Qt doesn't (yet?)
support setting the target early without using qt_add_executable (which
require setting sources).

Fixes #476.
--- CMakeLists.txt.orig	2025-07-05 12:21:26 UTC
+++ CMakeLists.txt
@@ -7,6 +7,10 @@ add_compile_options(-Wall -Wextra -O2)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 add_compile_options(-Wall -Wextra -O2)
 
+if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
+    add_compile_definitions(BOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED)
+endif()
+
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON) # For clangd
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)