https://git.ruby-lang.org/ruby.git/commit/?id=2ddc67ffb6

From 2ddc67ffb6bd62550343db909bf5672d6d523682 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: Sat, 22 Aug 2020 14:12:12 +0900
Subject: configure.ac: suppress more Sun C warnings.

They are rather annoying than being useful to us.

diff --git a/configure.ac b/configure.ac
index 5f16c12..37b4c53 100644
--- a/configure.ac
+++ b/configure.ac
@@ -630,8 +630,17 @@ AC_COMPILE_IFELSE([ https://github.com/ruby/ruby/blob/trunk/configure.ac#L630
 @%:@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)])],[])
+    for e in \
+        E_STATEMENT_NOT_REACHED \
+        E_INIT_SIGN_EXTEND \
+        E_INIT_DOES_NOT_FIT \
+        E_INITIALIZATION_TYPE_MISMATCH
+    do
+        RUBY_TRY_CFLAGS([-erroff=${e}], [
+            RUBY_APPEND_OPTIONS(rb_cv_warnflags, [-erroff=${e}])
+        ])
+    done
+])
 
 AC_ARG_WITH(compress-debug-sections,
 	AS_HELP_STRING([--with-compress-debug-sections=type],
-- 
cgit v0.10.2


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