merge revision(s) 2b6fc9ea7212543a1be26768403f59c7a759b5ea: [Backport #21092]

	[Bug #21092] Fallback variables after execonf has done

	When reading from a dummy makefile, the global variables initialized
	in `init_mkmf` may not be overridden.
	---
	 ext/extmk.rb | 6 +++---
	 1 file changed, 3 insertions(+), 3 deletions(-)

2 files changed, 4 insertions, 4 deletions

diff --git a/ext/extmk.rb b/ext/extmk.rb
index c9881a4b0e..4e77a7167b 100755
--- a/ext/extmk.rb
+++ b/ext/extmk.rb
@@ -171,8 +171,6 @@ def extmake(target, basedir = 'ext', maybestatic = true)
     $mdir = target
     $srcdir = File.join($top_srcdir, basedir, $mdir)
     $preload = nil
-    $objs = []
-    $srcs = []
     $extso = []
     makefile = "./Makefile"
     static = $static
@@ -206,7 +204,7 @@ def extmake(target, basedir = 'ext', maybestatic = true)
       begin
 	$extconf_h = nil
 	ok &&= extract_makefile(makefile)
-	old_objs = $objs
+	old_objs = $objs || []
 	old_cleanfiles = $distcleanfiles | $cleanfiles
 	conf = ["#{$srcdir}/makefile.rb", "#{$srcdir}/extconf.rb"].find {|f| File.exist?(f)}
 	if (!ok || ($extconf_h && !File.exist?($extconf_h)) ||
@@ -269,6 +267,8 @@ def extmake(target, basedir = 'ext', maybestatic = true)
     unless $destdir.to_s.empty? or $mflags.defined?("DESTDIR")
       args += ["DESTDIR=" + relative_from($destdir, "../"+prefix)]
     end
+    $objs ||= []
+    $srcs ||= []
     if $static and ok and !$objs.empty? and !noinstall
       args += ["static"]
       $extlist.push [(maybestatic ? $static : false), target, $target, $preload]
diff --git a/version.h b/version.h
index 61ce81fb09..fb18d49e35 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 7
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 253
+#define RUBY_PATCHLEVEL 254
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"