runruby.rb: support run.gdb by --debugger option

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60661 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

tool/runruby.rb

@@ -23,7 +23,13 @@ while arg = ARGV[0]
     # obsolete switch do nothing
   when re =~ "debugger"
     require 'shellwords'
-    precommand.concat(value ? (Shellwords.shellwords(value) unless value == "no") : %w"gdb --args")
+    case value
+    when nil
+      debugger = :gdb
+    when "no"
+    else
+      debugger = Shellwords.shellwords(value)
+    end and precommand |= [:debugger]
   when re =~ "precommand"
     require 'shellwords'
     precommand.concat(Shellwords.shellwords(value))
@@ -37,19 +43,28 @@ end
 
 unless defined?(File.realpath)
   def File.realpath(*args)
-    Dir.chdir(expand_path(*args)) do
-      Dir.pwd
+    path = expand_path(*args)
+    if File.stat(path).directory?
+      Dir.chdir(path) {Dir.pwd}
+    else
+      dir, base = File.split(path)
+      File.join(Dir.chdir(dir) {Dir.pwd}, base)
     end
   end
 end
 
 srcdir ||= File.realpath('..', File.dirname(__FILE__))
-archdir ||= '.'
+begin
+  conffile = File.realpath('rbconfig.rb', archdir)
+rescue Errno::ENOENT => e
+  abort "#$0: rbconfig.rb not found, use --archdir option"
+end
 
-abs_archdir = File.expand_path(archdir)
+abs_archdir = File.dirname(conffile)
+archdir ||= abs_archdir
 $:.unshift(abs_archdir)
 
-config = File.read(conffile = File.join(abs_archdir, 'rbconfig.rb'))
+config = File.read(conffile)
 config.sub!(/^(\s*)RUBY_VERSION\b.*(\sor\s*)\n.*\n/, '')
 config = Module.new {module_eval(config, conffile)}::RbConfig::CONFIG
 
@@ -106,12 +121,16 @@ end
 
 ENV.update env
 
-if ENV['RUNRUBY_USE_GDB'] == 'true'
-  if File.exist?('run.gdb')
-    precommand = %w'gdb -x run.gdb --args'
-  else
-    precommand = %w'gdb --args'
+if debugger or ENV['RUNRUBY_USE_GDB'] == 'true'
+  if debugger == :gdb
+    debugger = %w'gdb'
+    if File.exist?(gdb = 'run.gdb') or
+      File.exist?(gdb = File.join(abs_archdir, 'run.gdb'))
+      debugger.push('-x', gdb)
+    end
+    debugger << '--args'
   end
+  precommand[precommand.index(:debugger), 1] = debugger
 end
 
 cmd = [runner || ruby]