https://git.ruby-lang.org/ruby.git/commit/?id=72bbf60f3a

From 72bbf60f3a6b87a36bebc6b10ae867d8bcb9cadd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Thu, 30 Jan 2020 17:49:51 +0900
Subject: do not assume GCC for __builtin_setjmp

Namely recent Sun C compiler has this function, and is not a GCC.
Meanwhile the code without RUBY_JMP_BUF assumes GCC.  We have to define
the macro when we detect __builtin_setjmp for non-GCC compilers.

diff --git a/tool/m4/ruby_setjmp_type.m4 b/tool/m4/ruby_setjmp_type.m4
index 9da9a88..2989354 100644
--- a/tool/m4/ruby_setjmp_type.m4
+++ b/tool/m4/ruby_setjmp_type.m4
@@ -47,6 +47,6 @@ AS_IF([test x$setjmp_prefix:$setjmp_sigmask = xsig:], [ https://github.com/ruby/ruby/blob/trunk/tool/m4/ruby_setjmp_type.m4#L47
 AC_MSG_RESULT(${setjmp_prefix}setjmp${setjmp_suffix}${setjmp_cast:+\($setjmp_cast\)}${setjmp_sigmask})
 AC_DEFINE_UNQUOTED([RUBY_SETJMP(env)], [${setjmp_prefix}setjmp${setjmp_suffix}($setjmp_cast(env)${setjmp_sigmask})])
 AC_DEFINE_UNQUOTED([RUBY_LONGJMP(env,val)], [${setjmp_prefix}longjmp($setjmp_cast(env),val)])
-AS_IF([test x$setjmp_prefix != x__builtin_], AC_DEFINE_UNQUOTED(RUBY_JMP_BUF, ${setjmp_sigmask+${setjmp_prefix}}jmp_buf))
+AS_IF([test "(" "$GCC" != yes ")" -o x$setjmp_prefix != x__builtin_], AC_DEFINE_UNQUOTED(RUBY_JMP_BUF, ${setjmp_sigmask+${setjmp_prefix}}jmp_buf))
 AS_IF([test x$setjmp_suffix = xex], [AC_DEFINE_UNQUOTED(RUBY_USE_SETJMPEX, 1)])
 ])dnl
-- 
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