https://git.ruby-lang.org/ruby.git/commit/?id=d69c532685

From d69c5326856b8e5df35688cd12c15a7cbdf89f1c 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: Fri, 10 Apr 2020 10:23:17 +0900
Subject: configure: suppress SunPro warning

To this date there is no way for Oracle developer Studio to suppress
warnings about unreachable codes (12.6 manual says it implemented
__builtin_unreachable "as a no-op to C++. It might be added to C.")

There is no way but globally kill the warning.

diff --git a/configure.ac b/configure.ac
index 9c2cb14..7c12b9e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -576,6 +576,13 @@ AS_CASE(["$GCC:${warnflags+set}:${extra_warnflags:+set}:"], https://github.com/ruby/ruby/blob/trunk/configure.ac#L576
     warnflags=
 ])
 RUBY_TRY_CFLAGS(-Qunused-arguments, [RUBY_APPEND_OPTIONS(rb_cv_wsuppress_flags, -Qunused-arguments)])
+AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([
+@%:@if !(defined(__SUNPRO_C)||defined(__SUNPRO_CC))
+@%:@error not sunpro
+@%:@endif],[])], [
+    RUBY_TRY_CFLAGS(-erroff=E_STATEMENT_NOT_REACHED, [
+        RUBY_APPEND_OPTIONS(rb_cv_warnflags, -erroff=E_STATEMENT_NOT_REACHED)])],[])
 
 AC_ARG_WITH(compress-debug-sections,
 	AS_HELP_STRING([--with-compress-debug-sections=type],
-- 
cgit v0.10.2


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