https://git.ruby-lang.org/ruby.git/commit/?id=cdd613b299

From cdd613b2997944cd0d82f8d41071440779c19a99 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 9 Apr 2020 08:55:46 +0900
Subject: configure.ac: Skip C++ compiler of Sun OpenStudio

It fails to compile ext/-test-/cxxanyargs/cxxanyargs.cpp.
Need work to support it.  Contribution is welcome.

diff --git a/configure.ac b/configure.ac
index bd752d9..2d200a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -219,6 +219,11 @@ AS_CASE(["$build_os:${CXX}"], https://github.com/ruby/ruby/blob/trunk/configure.ac#L219
         AC_MSG_RESULT([$CXX])],
     [openbsd*:*], [
         AC_CHECK_TOOLS(CXX, [c++])
+    ],
+    [solaris*:*], [
+        dnl C++ compiler of Sun OpenStudio is not supported
+        AS_CASE(["/$CC "],
+            [*@<:@\ /@:>@"cc "*],      [CXX=no-c++])
     ])
 test -z "$CXX" || ac_cv_prog_CXX="$CXX"
 
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