fake.rb.in: accurate fake

* template/fake.rb.in: turn into erb template from autoconf
  template to fake more accurately.
* common.mk (fake.rb): needs preprocessed file now.
* version.c (Init_version): add dummy expression to
  RUBY_ENGINE_VERSION.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50810 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,13 @@
+Wed Jun 10 11:06:25 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* template/fake.rb.in: turn into erb template from autoconf
+	  template to fake more accurately.
+
+	* common.mk (fake.rb): needs preprocessed file now.
+
+	* version.c (Init_version): add dummy expression to
+	  RUBY_ENGINE_VERSION.
+
 Tue Jun  9 12:31:25 2015  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
 
 	* lib/prime.rb: Simplify and optimize EratosthenesSieve

common.mk

@@ -549,10 +549,10 @@ fake: $(CROSS_COMPILING)-fake
 yes-fake: $(arch)-fake.rb $(RBCONFIG) PHONY
 no-fake: PHONY
 
-$(arch)-fake.rb: $(RBCONFIG) $(srcdir)/template/fake.rb.in $(srcdir)/tool/expand-config.rb rbconfig.rb
-	@$(BOOTSTRAPRUBY) $(srcdir)/tool/expand-config.rb \
-		-output=$@ -mode=$(INSTALL_PROG_MODE) -expand -config=rbconfig.rb \
-		srcdir="$(srcdir)" BASERUBY="$(BASERUBY)" $(srcdir)/template/fake.rb.in
+$(arch)-fake.rb: $(srcdir)/template/fake.rb.in $(srcdir)/tool/generic_erb.rb version.i
+	$(ECHO) generating $@
+	@$(BOOTSTRAPRUBY) $(srcdir)/tool/generic_erb.rb -c -o $@ $(srcdir)/template/fake.rb.in \
+		i=version.i srcdir="$(srcdir)" BASERUBY="$(BASERUBY)"
 
 btest: $(TEST_RUNNABLE)-btest
 no-btest: PHONY

template/fake.rb.in

@@ -1,4 +1,18 @@
-baseruby="@BASERUBY@"
+<%
+arg = {}
+while /\A(\w+)=(.*)/ =~ ARGV[0]
+  arg[$1] = $2
+  arg[$1].tr!(File::ALT_SEPARATOR, File::SEPARATOR) if File::ALT_SEPARATOR
+  ARGV.shift
+end
+if arg['i']
+  src = File.read(arg['i'])
+  arg['versions'] = version = {}
+  src.scan(/rb_define_global_const\("(RUBY_\w+)",\s*(?:.*rb_\w*str_new\w*\((\w+)|\(*\(VALUE\)\((.+)\)\)\s*<<\s?)/) do |n, s, i|
+    version[n] = i ? i.to_i : src[/\b#{s}\[\]\s*=\s*((?:"(?:\\.|[^\"\\])*"\s*)*);/m, 1].gsub(/\A"|"\z|" *"/, '').gsub(/\\(.)/, '\1')
+  end
+end
+%>baseruby="<%=arg['BASERUBY']%>"
 ruby="${RUBY-$baseruby}"
 _=
 "eval" "{" \
@@ -10,20 +24,13 @@ ruby=ruby
 class Object
   remove_const :CROSS_COMPILING if defined?(CROSS_COMPILING)
   CROSS_COMPILING = RUBY_PLATFORM
-  remove_const :RUBY_PLATFORM
-  remove_const :RUBY_VERSION
-  remove_const :RUBY_PATCHLEVEL
-  remove_const :RUBY_RELEASE_DATE
-  remove_const :RUBY_DESCRIPTION if defined?(RUBY_DESCRIPTION)
-  RUBY_PLATFORM = "@arch@"
-  RUBY_VERSION = "@RUBY_PROGRAM_VERSION@"
-  RUBY_PATCHLEVEL = @PATCHLEVEL@
-  RUBY_RELEASE_DATE = "@RUBY_RELEASE_DATE@"
-  patchlevel_str = RUBY_PATCHLEVEL == -1 ? "dev" : "p#{RUBY_PATCHLEVEL}"
-  RUBY_DESCRIPTION = "ruby #{RUBY_VERSION}#{patchlevel_str} (#{RUBY_RELEASE_DATE}) [#{RUBY_PLATFORM}]"
+  constants.grep(/^RUBY_/) {|n| remove_const n}
+% arg['versions'].each  {|n, v|
+  <%=n%> = <%=v.inspect%>
+% }
 end
 builddir = File.dirname(File.expand_path(__FILE__))
-top_srcdir = File.expand_path("@srcdir@", builddir)
+top_srcdir = File.expand_path("<%=arg['srcdir']%>", builddir)
 $:.unshift(builddir)
 fake = File.join(top_srcdir, "tool/fake.rb")
 eval(File.read(fake), nil, fake)

version.c

@@ -38,11 +38,11 @@ VALUE ruby_engine_name = Qnil;
 void
 Init_version(void)
 {
-    VALUE v = MKSTR(version);
+    VALUE version;
     /*
      * The running version of ruby
      */
-    rb_define_global_const("RUBY_VERSION", v);
+    rb_define_global_const("RUBY_VERSION", (version = MKSTR(version)));
     /*
      * The date this ruby was released
      */
@@ -75,7 +75,7 @@ Init_version(void)
     /*
      * The version of the engine or interpreter this ruby uses.
      */
-    rb_define_global_const("RUBY_ENGINE_VERSION", v);
+    rb_define_global_const("RUBY_ENGINE_VERSION", (1 ? version : MKSTR(version)));
 }
 
 /*! Prints the version information of the CRuby interpreter to stdout. */