From 62741434db967488884dd8d72fb99f0c5bef9fb9 Mon Sep 17 00:00:00 2001
From: squidbus <175574877+squidbus@users.noreply.github.com>
Date: Thu, 15 Aug 2024 23:22:35 -0700
Subject: [PATCH] Enable -fexperimental-library when using clang libc++

---
 CMakeLists.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3685b7f8..09262d83 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -96,6 +96,15 @@ if(HAVE_SEM_TIMEDWAIT OR WIN32)
     add_compile_options(-DHAVE_SEM_TIMEDWAIT)
 endif()
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang")
+    # libc++ requires -fexperimental-library to enable std::jthread and std::stop_token support.
+    include(CheckCXXSymbolExists)
+    check_cxx_symbol_exists(_LIBCPP_VERSION version LIBCPP)
+    if(LIBCPP)
+        add_compile_options(-fexperimental-library)
+    endif()
+endif()
+
 add_subdirectory(externals)
 include_directories(src)