Issue #12896 has been reported by Yui NARUSE.

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Feature #12896: Add compiler version message into rbconfig
https://bugs.ruby-lang.org/issues/12896

* Author: Yui NARUSE
* Status: Open
* Priority: Normal
* Assignee: 
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When a extension library developer receives bug reports, they sometimes want to know what compiler is used for building the ruby binary.
We can already know its compiler option but cannot know compiler name and version.

```diff
diff --git a/configure.in b/configure.in
index 3734afa..6793d7d 100644
--- a/configure.in
+++ b/configure.in
@@ -536,8 +536,10 @@ for option in --version -v -V -qversion; do
     AS_CASE($cc_version_status, [0], [:], [continue])
     AS_CASE($cc_version_message, [*Warning*], [continue])
     cc_version='$(CC) '$option
+    break
 done
 AC_SUBST(CC_VERSION, $cc_version)
+AC_SUBST(CC_VERSION_MESSAGE, $cc_version_message)

 RUBY_UNIVERSAL_ARCH
 if test "$target_cpu" != "$host_cpu" -a "$GCC" = yes -a "$cross_compiling" = no -a "$universal_binary" = no; then
```



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