Fix outdated build/README.txt

BUG=v8:2649

Review URL: https://codereview.chromium.org/13911011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14375 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

build/README.txt

-This directory contains the V8 GYP files used to generate actual project files
-for different build systems.
+For build instructions, please refer to:
 
-This is currently work in progress but this is expected to replace the SCons
-based build system.
+https://code.google.com/p/v8/wiki/BuildingWithGYP
 
-To use this a checkout of GYP is needed inside this directory. From the root of
-the V8 project do the following:
+TL;DR version on *nix:
+$ make dependencies        # Only needed once.
+$ make ia32.release -j8
+$ make ia32.release.check  # Optionally: run tests.
 
-$ svn co http://gyp.googlecode.com/svn/trunk build/gyp
-
-Note for the command lines below that Debug is the default configuration,
-so specifying that on the command lines is not required.
-
-
-To generate Makefiles on Linux:
--------------------------------
-
-$ build/gyp_v8
-
-This will build makefiles for ia32, x64 and the ARM simulator with names
-Makefile-ia32, Makefile-x64 and Makefile-armu respectively.
-
-To build and run for ia32 in debug and release version do:
-
-$ make -f Makefile-ia32
-$ out/Debug/shell
-$ make -f Makefile-ia32 BUILDTYPE=Release
-$ out/Release/shell
-
-Change the makefile to build and run for the other architectures.
-
-
-To generate Xcode project files on Mac OS:
-------------------------------------------
-
-$ build/gyp_v8
-
-This will make an Xcode project for the ia32 architecture. To build and run do:
-
-$ xcodebuild -project build/all.xcodeproj
-$ samples/build/Debug/shell
-$ xcodebuild -project build/all.xcodeproj -configuration Release
-$ samples/build/Release/shell
-
-
-To generate Visual Studio solution and project files on Windows:
-----------------------------------------------------------------
-
-On Windows an additional third party component is required. This is cygwin in
-the same version as is used by the Chromium project. This can be checked out
-from the Chromium repository. From the root of the V8 project do the following:
-
-> svn co http://src.chromium.org/svn/trunk/deps/third_party/cygwin@66844 third_party/cygwin
-
-To run GYP Python is required and it is recommended to use the same version as
-is used by the Chromium project. This can also be checked out from the Chromium
-repository. From the root of the V8 project do the following:
-
-> svn co http://src.chromium.org/svn/trunk/tools/third_party/python_26@89111 third_party/python_26
-
-Now generate Visual Studio solution and project files for the ia32 architecture:
-
-> third_party\python_26\python build/gyp_v8
-
-Now open build\All.sln in Visual Studio.