Add CMake build file as an alternative to configure.py
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..d313342
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,84 @@
+cmake_minimum_required(VERSION 3.1)
+project(ninja)
+
+if(MSVC)
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4 /GR-")
+else()
+ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated -fdiagnostics-color")
+endif()
+
+# the depfile parser and ninja lexers are generated using re2c.
+function(re2c IN OUT)
+ add_custom_command(DEPENDS ${IN} OUTPUT ${OUT}
+ COMMAND re2c -b -i --no-generation-date -o ${OUT} ${IN}
+ )
+endfunction()
+re2c(${CMAKE_SOURCE_DIR}/src/depfile_parser.in.cc ${CMAKE_BINARY_DIR}/depfile_parser.cc)
+re2c(${CMAKE_SOURCE_DIR}/src/lexer.in.cc ${CMAKE_BINARY_DIR}/lexer.cc)
+add_library(libninja-re2c OBJECT ${CMAKE_BINARY_DIR}/depfile_parser.cc ${CMAKE_BINARY_DIR}/lexer.cc)
+target_include_directories(libninja-re2c PRIVATE src)
+
+# Core source files all build into ninja library.
+add_library(libninja OBJECT
+ src/build_log.cc
+ src/build.cc
+ src/clean.cc
+ src/clparser.cc
+ src/dyndep.cc
+ src/dyndep_parser.cc
+ src/debug_flags.cc
+ src/deps_log.cc
+ src/disk_interface.cc
+ src/edit_distance.cc
+ src/eval_env.cc
+ src/graph.cc
+ src/graphviz.cc
+ src/line_printer.cc
+ src/manifest_parser.cc
+ src/metrics.cc
+ src/parser.cc
+ src/state.cc
+ src/string_piece_util.cc
+ src/util.cc
+ src/version.cc
+)
+if(WIN32)
+ target_sources(libninja PRIVATE
+ src/subprocess-win32.cc
+ src/includes_normalize-win32.cc
+ src/msvc_helper-win32.cc
+ src/msvc_helper_main-win32.cc
+ )
+else()
+ target_sources(libninja PRIVATE src/subprocess-posix.cc)
+endif()
+
+# Main executable is library plus main() function.
+add_executable(ninja src/ninja.cc)
+target_link_libraries(ninja PRIVATE libninja libninja-re2c)
+
+# Tests all build into ninja_test executable.
+add_executable(ninja_test
+ src/build_log_test.cc
+ src/build_test.cc
+ src/clean_test.cc
+ src/clparser_test.cc
+ src/depfile_parser_test.cc
+ src/deps_log_test.cc
+ src/disk_interface_test.cc
+ src/dyndep_parser_test.cc
+ src/edit_distance_test.cc
+ src/graph_test.cc
+ src/lexer_test.cc
+ src/manifest_parser_test.cc
+ src/ninja_test.cc
+ src/state_test.cc
+ src/string_piece_util_test.cc
+ src/subprocess_test.cc
+ src/test.cc
+ src/util_test.cc
+)
+if(WIN32)
+ target_sources(ninja_test PRIVATE src/includes_normalize_test.cc src/msvc_helper_test.cc)
+endif()
+target_link_libraries(ninja_test PRIVATE libninja libninja-re2c)
