check in a script that generates build.ninja

This will allow us to:
1) simplify bootstrap
2) generate windows-style paths on windows

It is also in line with ninja's philosophy: the build file syntax
is simple because the build files are easy to generate.

1 files changed, 147 insertions, 0 deletions

diff --git a/gen-build-file.py b/gen-build-file.py
new file mode 100755
index 0000000..904035c
--- /dev/null
+++ b/gen-build-file.py
@@ -0,0 +1,147 @@
+#!/usr/bin/python
+#
+# Copyright 2001 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Script that generates the build.ninja for ninja itself.
+
+Projects that use ninja themselves should either write a similar script
+or use a meta-build system that supports Ninja output."""
+
+import os
+import sys
+sys.path.insert(0, 'misc')
+
+import ninja
+
+n = ninja.Writer(sys.stdout)
+n.comment('This file is used to build ninja itself.')
+n.comment('It is generated by ' + os.path.basename(__file__) + '.')
+n.newline()
+
+def src(filename):
+    return os.path.join('src', filename)
+def built(filename):
+    return os.path.join('$builddir', filename)
+def cxx(name, **kwargs):
+    return n.build(built(name + '.o'), 'cxx', src(name + '.cc'), **kwargs)
+
+n.variable('builddir', 'build')
+n.variable('cxx', os.environ.get('CC', 'g++'))
+cflags = ('-O2 -g -Wall -Wno-deprecated -fno-exceptions -fvisibility=hidden '
+          '-pipe')
+if 'CFLAGS' in os.environ:
+    cflags += ' ' + os.environ['CFLAGS']
+n.variable('cflags', cflags)
+n.variable('ldflags', os.environ.get('LDFLAGS', ''))
+n.newline()
+
+n.rule('cxx',
+       command='$cxx -MMD -MF $out.d $cflags -c $in -o $out',
+       depfile='$out.d',
+       description='CC $out')
+n.newline()
+
+n.rule('ar',
+       command='ar crs $out $in',
+       description='AR $out')
+n.newline()
+
+n.rule('link',
+       command='$cxx $ldflags -o $out $in',
+       description='LINK $out')
+n.newline()
+
+n.comment('browse_py.h is used to inline browse.py.')
+n.rule('inline',
+       command='src/inline.sh $varname < $in > $out',
+       description='INLINE $out')
+n.build(built('browse_py.h'), 'inline', src('browse.py'),
+        variables=[('varname', 'kBrowsePy')])
+n.newline()
+
+objs = []
+
+n.comment("TODO: this shouldn't need to depend on inline.sh.")
+objs += cxx('browse',
+            implicit='src/inline.sh',
+            order_only=built('browse_py.h'))
+n.newline()
+
+n.comment('Core source files all build into ninja library.')
+for name in ['build', 'build_log', 'clean', 'eval_env', 'graph', 'graphviz',
+             'parsers', 'subprocess', 'util',
+             'ninja_jumble']:
+    objs += cxx(name)
+ninja_lib = n.build(built('ninja.a'), 'ar', objs)
+n.newline()
+
+n.comment('Main executable is library plus main() function.')
+objs = cxx('ninja')
+n.build('ninja', 'link', objs + ninja_lib)
+
+n.comment('Tests all build into ninja_test executable.')
+objs = []
+for name in ['build_test', 'build_log_test', 'graph_test', 'ninja_test',
+             'parsers_test', 'subprocess_test', 'util_test',
+             'test']:
+    objs += cxx(name)
+ldflags = '-lgtest -lgtest_main -lpthread'
+if 'LDFLAGS' in os.environ:
+    ldflags += ' ' + os.environ.get('LDFLAGS')
+n.build('ninja_test', 'link',
+        objs + ninja_lib,
+        variables=[('ldflags', ldflags)])
+n.newline()
+
+n.comment('Generate a graph using the "graph" tool.')
+n.rule('gendot',
+       command='./ninja -t graph > $out')
+n.rule('gengraph',
+       command='dot -Tpng $in > $out')
+dot = n.build(built('graph.dot'), 'gendot', ['ninja', 'build.ninja'])
+n.build('graph.png', 'gengraph', dot)
+n.newline()
+
+n.comment('Generate the manual using asciidoc.')
+n.rule('asciidoc',
+       command='asciidoc -a toc $in',
+       description='ASCIIDOC $in')
+n.build('manual.html', 'asciidoc', 'manual.asciidoc')
+n.build('manual', 'phony',
+        order_only='manual.html')
+n.newline()
+
+n.comment('Generate Doxygen.')
+n.rule('doxygen',
+       command='doxygen $in',
+       description='DOXYGEN $in')
+n.variable('doxygen_mainpage_generator',
+           './gen_doxygen_mainpage.sh')
+n.rule('doxygen_mainpage',
+       command='$doxygen_mainpage_generator $in > $out',
+       description='DOXYGEN_MAINPAGE $out')
+mainpage = n.build(built('doxygen_mainpage'), 'doxygen_mainpage',
+                   ['README', 'HACKING', 'COPYING'],
+                   implicit=['$doxygen_mainpage_generator'])
+n.build('doxygen', 'doxygen', 'doxygen.config',
+        implicit=mainpage,
+        order_only=mainpage)
+n.newline()
+
+n.comment('Regenerate build files if build script changes.')
+n.rule('gen-build-file',
+       command='./gen-build-file.py > $out')
+n.build('build.ninja', 'gen-build-file',
+        implicit='gen-build-file.py')