From a8f78b2d549744b4f1b696f2bf05cf3d1bce31b0 Mon Sep 17 00:00:00 2001
From: majiayu000 <1835304752@qq.com>
Date: Thu, 8 Jan 2026 17:45:16 +0800
Subject: [PATCH] build: use C++17 standard for macOS compatibility

Modern Apple SDK headers (macOS 26+, Xcode 17+) require elaborated enum
base declarations which are not supported in C++11. This causes
compilation failures with errors like:
  "non-defining declaration of enumeration with a fixed underlying type
   is only permitted as a standalone declaration"

Setting CMAKE_CXX_STANDARD to 17 resolves this issue while maintaining
backward compatibility with other platforms.

Fixes #350

Signed-off-by: majiayu000 <1835304752@qq.com>
---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5c8382e34..fc90e187c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,10 @@ option(BITNET_ARM_TL1    "bitnet.cpp: use tl1 on arm platform"    OFF)
 option(BITNET_X86_TL2    "bitnet.cpp: use tl2 on x86 platform"    OFF)
 
 
+# Use C++17 to support modern Apple SDK headers which require elaborated enum base
+# declarations not available in C++11. This fixes compilation on macOS with
+# recent Xcode/AppleClang versions. See issue #350.
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED true)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_STANDARD_REQUIRED true)