From 02725320fd14bf1d236f75c7f6ad8b6217b71a9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Matos?= <joao@tritao.eu>
Date: Tue, 30 May 2023 16:39:37 +0100
Subject: [PATCH] Workaround parsing GNU system headers with GCC 11.0 version.
 (#1737)

Closes https://github.com/mono/CppSharp/issues/1703.

Upstream bugs:

  https://github.com/llvm/llvm-project/issues/51607
  https://github.com/llvm/llvm-project/issues/53152
---
 src/Parser/ParserOptions.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Parser/ParserOptions.cs b/src/Parser/ParserOptions.cs
index cde493bd..7cda0375 100644
--- a/src/Parser/ParserOptions.cs
+++ b/src/Parser/ParserOptions.cs
@@ -240,9 +240,11 @@ namespace CppSharp.Parser
             GetUnixCompilerInfo(headersPath, out var compiler, out var longVersion, out var shortVersion);
 
             AddSystemIncludeDirs(BuiltinsDir);
-            AddArguments($"-fgnuc-version={longVersion}");
 
             var majorVersion = shortVersion.Split('.')[0];
+            // Workaround https://github.com/llvm/llvm-project/issues/53152, remove once bug is fixed.
+            AddArguments(int.Parse(majorVersion) >= 11 ? $"-fgnuc-version=10.1" : $"-fgnuc-version={longVersion}");
+
             string[] versions = { longVersion, shortVersion, majorVersion };
             string[] triples = { "x86_64-linux-gnu", "x86_64-pc-linux-gnu" };
             if (compiler == "gcc")