Get open-vcdiff building on Linux and Mac (in SCons) using...

sdch/SConscript

 # Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import re
+
 Import('env')
 
 env = env.Clone(OPEN_VCDIFF_DIR='open_vcdiff/depot/opensource/open-vcdiff')
 
-env.Prepend(
-  CPPPATH = [
+cpppath = [
     '$OPEN_VCDIFF_DIR/src',
-    '$OPEN_VCDIFF_DIR/vsprojects',
-  ],
-)
+]
+
+if env['PLATFORM'] == 'win32':
+  cpppath.append('$OPEN_VCDIFF_DIR/vsprojects')
+
+env.Prepend(CPPPATH = cpppath)
 
 input_files = [
     '$OPEN_VCDIFF_DIR/src/addrcache.cc',
     '$OPEN_VCDIFF_DIR/src/adler32.c',
     '$OPEN_VCDIFF_DIR/src/blockhash.cc',
     '$OPEN_VCDIFF_DIR/src/codetable.cc',
     '$OPEN_VCDIFF_DIR/src/decodetable.cc',
     '$OPEN_VCDIFF_DIR/src/encodetable.cc',
     '$OPEN_VCDIFF_DIR/src/headerparser.cc',
     '$OPEN_VCDIFF_DIR/src/logging.cc',
     '$OPEN_VCDIFF_DIR/src/varint_bigendian.cc',
     '$OPEN_VCDIFF_DIR/src/vcdecoder.cc',
     '$OPEN_VCDIFF_DIR/src/vcdiffengine.cc',
 ]
 
 env.ChromeStaticLibrary('sdch', input_files)
+
+if env['PLATFORM'] in ('posix', 'darwin'):
+
+  # Generate a target config.h file from a source config.h.in file.
+  #
+  # The list of defines has been taken empirically from Autoconf
+  # (./configure) runs on Mac OS X and Ubuntu Hardy.
+
+  defines = [
+      'HAVE_DLFCN_H',
+      'HAVE_FNMATCH_H',
+      'HAVE_GETOPT_H',
+      'HAVE_GETTIMEOFDAY',
+      'HAVE_INTTYPES_H',
+      'HAVE_MEMORY_H',
+      'HAVE_MPROTECT',
+      'HAVE_PTHREAD',
+      'HAVE_STDINT_H',
+      'HAVE_STDLIB_H',
+      'HAVE_STRINGS_H',
+      'HAVE_STRING_H',
+      'HAVE_STRTOLL',
+      'HAVE_STRTOQ',
+      'HAVE_SYS_MMAN_H',
+      'HAVE_SYS_STAT_H',
+      'HAVE_SYS_TIME_H',
+      'HAVE_SYS_TYPES_H',
+      'HAVE_UINT16_T',
+      'HAVE_UNISTD_H',
+      'HAVE_U_INT16_T',
+      'HAVE___ATTRIBUTE__',
+      ('PACKAGE', '"open-vcdiff"'),
+      ('PACKAGE_BUGREPORT', '"opensource@google.com"'),
+      ('PACKAGE_NAME', '"open-vcdiff"'),
+      ('PACKAGE_STRING', '"open-vcdiff 0.1"'),
+      ('PACKAGE_TARNAME', '"open-vcdiff"'),
+      ('PACKAGE_VERSION', '"0.1"'),
+      ('VERSION', '"0.1"'),
+      'STDC_HEADERS',
+  ]
+
+  if env['PLATFORM'] == 'posix':
+    defines.extend([
+        'HAVE_MALLOC_H',
+        'HAVE_MEMALIGN',
+        'HAVE_POSIX_MEMALIGN',
+    ])
+
+  if env['PLATFORM'] == 'darwin':
+    defines.extend([
+        'HAVE_WORKING_KQUEUE',
+    ])
+
+  def AutoConfig(target, source, env):
+    """
+    Action to generate a config.h file from an Autotools config.h.in file,
+    given the list of definitions in the DEFINES construction variable.
+
+    Each entry in DEFINES is either a string, in which case it
+    will be enabled with a value of 1, or a tuple, in which case
+    the first element is the #define name and the second its value.
+
+    Any leftover #undef lines get commented out.
+    """
+    contents = open(str(source[0]), 'r').read()
+
+    for d in env['DEFINES']:
+        if isinstance(d, tuple):
+            define, value = d
+        else:
+            define = d
+            value = 1
+        undef = '^#undef %s$' % re.escape(define)
+        definition = '#define %s %s' % (define, value)
+        contents = re.sub(undef, definition, contents)
+
+    undef_re = re.compile(r'^(#undef .*)$', re.M)
+    contents = undef_re.sub(r'/* \1 */', contents)
+
+    header = '/* src/config.h.  Generated by SCons.  */\n'
+    open(str(target[0]), 'w').write(header + contents)
+
+  # varlist['DEFINES'] below makes the target config.h file depend
+  # on the list of definitions in the passed-in $DEFINES variable.
+  env.Command('$OPEN_VCDIFF_DIR/src/config.h',
+              '$OPEN_VCDIFF_DIR/src/config.h.in',
+              Action(AutoConfig, varlist=['DEFINES']),
+              DEFINES=defines)