make elf symbols optional

and default to false. Smaller executables  by at least half
also add option for compiler cli

test/elf/helper.rb

@@ -21,61 +21,5 @@ module Elf
       writer = Elf::ObjectWriter.new(linker)
       writer.save "test/#{file}.o"
     end
-
-    def check_remote(file)
-      check(file)
-      stdout , exit_code = run_ssh(file)
-      @stdout = "" unless @stdout
-      assert_equal @stdout , stdout
-      assert_equal @exit_code , exit_code
-    end
-
-    def run_ssh( file )
-      host = ENV["ARM_HOST"]
-      return unless host
-      port = (ENV["ARM_PORT"] || 2222)
-      user = (ENV["ARM_USER"] || "pi")
-      binary_file = "/tmp/#{file}"
-      object_file = binary_file + ".o"
-      Net::SCP.start(host, user , port: port ) do |scp|
-        puts "Copying test/#{file}.o to #{object_file}" if DEBUG
-        scp.upload! "test/#{file}.o",  object_file
-      end
-      Net::SSH.start(host, user , port: port ) do |ssh|
-        puts "Linking #{object_file}" if DEBUG
-        stdout , exit_code = ssh_exec!(ssh , "ld -N -o #{binary_file} #{object_file}")
-        assert_equal 0 , exit_code , "Linking #{binary_file} failed"
-        puts "Running #{binary_file}" if DEBUG
-        stdout , exit_code = ssh_exec!(ssh , binary_file)
-        puts "Result #{stdout} #{exit_code}" if DEBUG
-        return stdout , exit_code
-      end
-    end
-
-    def ssh_exec!(ssh, command)
-      stdout_data = ""
-      exit_code = nil
-      ssh.open_channel do |channel|
-        channel.exec(command) do |ch, success|
-          unless success
-            raise "FAILED: couldn't execute command (ssh.channel.exec)"
-          end
-          channel.on_data do |c,data|
-            stdout_data+=data
-          end
-          channel.on_extended_data do |c,type,data|
-            raise "#{ssh} received stderr #{data}"
-          end
-          channel.on_request("exit-status") do |c,data|
-            exit_code = data.read_long
-          end
-          channel.on_request("exit-signal") do |c, data|
-            raise "#{ssh} received signal #{data.read_long}"
-          end
-        end
-      end
-      ssh.loop
-      [stdout_data, exit_code]
-    end
   end
 end