From fdd1d7d60c33b08f4181df8e81c739694762898b Mon Sep 17 00:00:00 2001
From: Victor Perevertkin <victor@perevertkin.ru>
Date: Sun, 20 Oct 2019 13:44:17 +0300
Subject: [PATCH] [MSVCRT] Export __acrt_iob_func to fix GCC build with latest
 RosBE 2.2 (#1835)

This adds an evil hack to persuade libstdc++, which tries to import __acrt_iob_func from a DLL.
This can only be solved cleanly by adding a GCC-compatible C++ standard library to our tree later.
---
 sdk/lib/crt/msvcrtex.cmake        |  3 ++-
 sdk/lib/crt/stdio/acrt_iob_func.c | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 sdk/lib/crt/stdio/acrt_iob_func.c

diff --git a/sdk/lib/crt/msvcrtex.cmake b/sdk/lib/crt/msvcrtex.cmake
index c46751007ad..5be20560a53 100644
--- a/sdk/lib/crt/msvcrtex.cmake
+++ b/sdk/lib/crt/msvcrtex.cmake
@@ -39,7 +39,8 @@ list(APPEND MSVCRTEX_SOURCE
     misc/fltused.c
     misc/isblank.c
     misc/iswblank.c
-    misc/ofmt_stub.c)
+    misc/ofmt_stub.c
+    stdio/acrt_iob_func.c)
 
 if(MSVC)
     list(APPEND MSVCRTEX_SOURCE
diff --git a/sdk/lib/crt/stdio/acrt_iob_func.c b/sdk/lib/crt/stdio/acrt_iob_func.c
new file mode 100644
index 00000000000..223ea36b5fa
--- /dev/null
+++ b/sdk/lib/crt/stdio/acrt_iob_func.c
@@ -0,0 +1,24 @@
+/*
+ * PROJECT:     ReactOS CRT library
+ * LICENSE:     LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
+ * PURPOSE:     __acrt_iob_func implementation
+ * COPYRIGHT:   Victor Perevertkin <victor.perevertkin@reactos.org>
+ */
+
+// Evil hack necessary, because we're linking to the RosBE-provided libstdc++ when using GCC.
+// This can only be solved cleanly by adding a GCC-compatible C++ standard library to our tree.
+#ifdef __GNUC__
+
+#include <precomp.h>
+
+/*********************************************************************
+ *    __acrt_iob_func(MSVCRT.@)
+ */
+FILE * CDECL __acrt_iob_func(int index)
+{
+    return &__iob_func()[index];
+}
+
+const void* _imp____acrt_iob_func = __acrt_iob_func;
+
+#endif