From 46b4f69a281884f0613f10bdcce1d07d32d74e90 Mon Sep 17 00:00:00 2001
From: Thomas Bleher <thomas.tb.bleher@bmw.de>
Date: Thu, 29 Jun 2023 14:24:49 +0200
Subject: [PATCH] Support _GLIBCXX_DEBUG

libstdc++ has a special debug mode, which is enabled by #define-ing
_GLIBCXX_DEBUG. In this mode std::vector is actually
std::__debug::vector. Adjust the vector forward declaration to make the
code build when _GLIBCXX_DEBUG is defined.
---
 src/c4/std/vector_fwd.hpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/c4/std/vector_fwd.hpp b/src/c4/std/vector_fwd.hpp
index a739b7d2..55025bd5 100644
--- a/src/c4/std/vector_fwd.hpp
+++ b/src/c4/std/vector_fwd.hpp
@@ -13,7 +13,13 @@ __pragma(warning(disable : 4643))
 #endif
 namespace std {
 template<typename> class allocator;
+#ifdef _GLIBCXX_DEBUG
+inline namespace __debug {
 template<typename T, typename Alloc> class vector;
+}
+#else
+template<typename T, typename Alloc> class vector;
+#endif
 } // namespace std
 #if defined(_MSC_VER)
 __pragma(warning(pop))