From 25430cf68b10a7f2728f583bf653a7e83bc1d203 Mon Sep 17 00:00:00 2001
From: Nana Sakisaka <1901813+saki7@users.noreply.github.com>
Date: Mon, 9 Mar 2026 21:15:00 +0900
Subject: [PATCH 1/2] Optimize Windows build flags

---
 CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fcd3dea..1e8a86f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -113,6 +113,13 @@ unset(IRIS_CXX_FEATURE_BEFORE_LATEST)
 # -----------------------------------------------------------------
 # Advanced compile/link settings
 
+if(WIN32)
+    target_compile_definitions(
+        _iris_cxx_common
+        INTERFACE NOMINMAX WIN32_LEAN_AND_MEAN
+    )
+endif()
+
 if(MSVC)
     # Don't set too strict flags for testing! They must go to `iris_cxx_test`.
     # ABI-dependent configurations MUST be set here.

From 4cbc795dee5f472a452115a0338c8c6038aa12e3 Mon Sep 17 00:00:00 2001
From: Nana Sakisaka <1901813+saki7@users.noreply.github.com>
Date: Mon, 9 Mar 2026 21:20:11 +0900
Subject: [PATCH 2/2] Add `/Zc:__cplusplus`

---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e8a86f..673d6cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,7 +130,7 @@ if(MSVC)
     target_compile_options(
         _iris_cxx_common
         INTERFACE
-            /EHsc /MP /utf-8 /Zc:preprocessor /permissive-
+            /EHsc /MP /utf-8 /Zc:__cplusplus /Zc:preprocessor /permissive-
             # $<$<CONFIG:Debug,RelWithDebInfo>:/fsanitize=address> # TODO
     )
     target_link_options(