From 51a91d6c5d87fb85945f8c99b1e678e05d0723c0 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Sat, 6 Aug 2022 07:51:06 -0400
Subject: [PATCH] [gn build] port b1356504e63ae (c++17)

---
 llvm/utils/gn/build/BUILD.gn | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/llvm/utils/gn/build/BUILD.gn b/llvm/utils/gn/build/BUILD.gn
index 5e7131cd0ded..23200402905b 100644
--- a/llvm/utils/gn/build/BUILD.gn
+++ b/llvm/utils/gn/build/BUILD.gn
@@ -117,7 +117,7 @@ config("compiler_defaults") {
       ldflags += [ "-Wl,--color-diagnostics" ]
     }
     cflags_cc += [
-      "-std=c++14",
+      "-std=c++17",
       "-fvisibility-inlines-hidden",
     ]
   } else {
@@ -160,7 +160,10 @@ config("compiler_defaults") {
       "_UNICODE",
       "UNICODE",
     ]
-    cflags += [ "/EHs-c-" ]
+    cflags += [
+      "/std:c++17",
+      "/EHs-c-",
+    ]
 
     # The MSVC default value (1 MB) is not enough for parsing recursive C++
     # templates in Clang.