https://git.ruby-lang.org/ruby.git/commit/?id=99bfa6c165

From 99bfa6c16562f7af7fb6daf3cf89680ef30d4163 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Fri, 6 Sep 2019 17:47:24 +0900
Subject: Try to fix compile error on win32

https://github.com/ruby/ruby/runs/213995386#step:7:810
```
cxxanyargs.cpp
C:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\ucrt\corecrt_malloc.h(54): error C2485: '__restrict': unrecognized extended attribute
```

diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index a990a55..13463d3 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -861,11 +861,13 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub https://github.com/ruby/ruby/blob/trunk/win32/Makefile.sub#L861
 #define RUBY_LONGJMP(env,val) longjmp(env,val)
 #define RUBY_JMP_BUF jmp_buf
 #define inline __inline
+#ifndef __cplusplus
 !if $(MSC_VER) >= 1800
 #define restrict __restrict
 !else
 #define restrict /* not supported */
 !endif
+#endif
 #define NEED_IO_SEEK_BETWEEN_RW 1
 !if "$(MACHINE)" == "x86" || "$(ARCH)" == "x64"
 #define STACK_GROW_DIRECTION -1
-- 
cgit v0.10.2


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