From 9649eee307d15321010ab60a89d79fe31a9863a4 Mon Sep 17 00:00:00 2001
From: Yonggang Luo <luoyonggang@gmail.com>
Date: Sat, 22 Nov 2025 01:05:35 +0800
Subject: [PATCH] meson: Use /Zc:enumTypes enables C++ conforming enum
 underlying type and enumerator type deduction

The detail is at https://learn.microsoft.com/en-us/cpp/build/reference/zc-enumtypes?view=msvc-170

For example:

enum Enum {
    A = 'A',
    B = sizeof(A)
};

static_assert(B == 1); // previously failed, now succeeds under /Zc:enumTypes

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38639>
---
 meson.build | 1 +
 1 file changed, 1 insertion(+)

diff --git a/meson.build b/meson.build
index aecca8fda00..ef0e5b0ddd6 100644
--- a/meson.build
+++ b/meson.build
@@ -1169,6 +1169,7 @@ if cc.get_argument_syntax() == 'msvc'
     '/we4024',  # Error when passing different type of parameter
     '/we4189',  # 'identifier' : local variable is initialized but not referenced
     '/Zc:__cplusplus', #Set __cplusplus macro to match the /std:c++<version> on the command line
+    '/Zc:enumTypes', # Enables C++ conforming enum underlying type and enumerator type deduction
     '/Zc:preprocessor', # Use the standards-conforming preprocessor
   ]
   c_args += cc.get_supported_arguments(_trial)