* README, README.ja: Add a note about default C flags.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@16728 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Sat May 31 23:33:34 2008  Akinori MUSHA  <knu@iDaemons.org>
+
+	* README, README.ja: Add a note about default C flags.
+
 Sat May 31 22:11:15 2008  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
 
 	* version.c (ruby_description, ruby_copyright): backported from

NEWS

@@ -11,6 +11,12 @@ with all sufficient information, see the ChangeLog file.
 
 === Configuration changes
 
+* default C flags
+
+  Some C compiler flags may be added by default depending on your
+  environment.  Specify optflags=.. and warnflags=.. as necessary to
+  override them.
+
 * vendor_ruby directory
 
   A new library directory named `vendor_ruby' is introduced in

README

@@ -70,6 +70,10 @@ This is what you need to do to compile and install Ruby:
 
   2. Run ./configure, which will generate config.h and Makefile.
 
+     Some C compiler flags may be added by default depending on your
+     environment.  Specify optflags=.. and warnflags=.. as necessary
+     to override them.
+
   3. Edit defines.h if you need.  Usually this step will not be needed.
 
   4. Remove comment mark(#) before the module names from ext/Setup (or

README.ja

@@ -92,6 +92,10 @@ Ruby
 
   2. configureを実行してMakefileなどを生成する
 
+     環境によってはデフォルトのCコンパイラ用オプションが付き
+     ます．configureオプションで optflags=.. warnflags=.. 等
+     で上書きできます．
+
   3. (必要ならば)defines.hを編集する
 
      多分，必要無いと思います．