Show a more verbose message if BASERUBY is too old

Author: eightbitraptor

configure.ac

@@ -84,7 +84,7 @@ AC_ARG_WITH(baseruby,
 		AC_PATH_PROG([BASERUBY], [ruby], [false])
 	])
 AS_IF([test "$HAVE_BASERUBY" != no], [
-    RUBYOPT=- $BASERUBY --disable=gems -rerb -rfileutils -rtempfile "${tooldir}/missing-baseruby.bat" || HAVE_BASERUBY=no
+    RUBYOPT=- $BASERUBY --disable=gems "${tooldir}/missing-baseruby.bat" --verbose || HAVE_BASERUBY=no
 ])
 AS_IF([test "${HAVE_BASERUBY:=no}" != no], [
     AS_CASE(["$build_os"], [mingw*], [

tool/missing-baseruby.bat

@@ -21,5 +21,10 @@ call :warn "executable host ruby is required.  use --with-baseruby option."
 call :warn "Note that BASERUBY must be Ruby 3.1.0 or later."
 call :abort
 (goto :eof ^;)
-abort unless defined?(RubyVM::InstructionSequence)
-abort if RUBY_VERSION < s[%r"warn .*Ruby ([\d.]+)(?:\.0)?",1]
+verbose = true if ARGV[0] == "--verbose"
+case
+when !defined?(RubyVM::InstructionSequence)
+  abort(*(["BASERUBY must be CRuby"] if verbose))
+when RUBY_VERSION < s[%r[warn .*\KBASERUBY .*Ruby ([\d.]+)(?:\.0)?.*(?=\")],1]
+  abort(*(["#{$&}. Found: #{RUBY_VERSION}"] if verbose))
+end

win32/setup.mak

@@ -47,7 +47,7 @@ prefix = $(prefix:\=/)
 	@type $(config_make) >>$(MAKEFILE)
 	@del $(config_make) > nul
 !if "$(HAVE_BASERUBY)" != "no" && "$(BASERUBY)" != ""
-	$(BASERUBY:/=\) "$(srcdir)/tool/missing-baseruby.bat"
+	$(BASERUBY:/=\) "$(srcdir)/tool/missing-baseruby.bat" --verbose
 !endif
 !if "$(WITH_GMP)" != "no"
 	@($(CC) $(XINCFLAGS) <<conftest.c -link $(XLDFLAGS) gmp.lib > nul && (echo USE_GMP = yes) || exit /b 0) >>$(MAKEFILE)