Have cygdb pass gdb command line arguments to gdb

Write cython_debug to the actual build directory (distutils and the cython
                                                  command line tool)
List --debug flag in cython's usage

Cython/Compiler/CmdLine.py

@@ -2,6 +2,7 @@
 #   Cython - Command Line Parsing
 #
 
+import os
 import sys
 import Options
 
@@ -27,6 +28,7 @@ Options:
                                  Level indicates aggressiveness, default 0 releases nothing. 
   -w, --working <directory>      Sets the working directory for Cython (the directory modules 
                                  are searched from)
+  --debug                        Output debug information for cygdb
 
   -D, --no-docstrings            Remove docstrings.
   -a, --annotate                 Produce a colorized HTML version of the source.
@@ -115,6 +117,7 @@ def parse_command_line(args):
                 options.emit_linenums = True
             elif option == "--debug":
                 options.debug = True
+                options.output_dir = os.curdir
             elif option == '-2':
                 options.language_level = 2
             elif option == '-3':

Cython/Compiler/Main.py

@@ -179,8 +179,8 @@ class Context(object):
             test_support.append(TreeAssertVisitor())
 
         if options.debug:
-            import ParseTreeTransforms
-            debug_transform = [ParseTreeTransforms.DebuggerTransform(self)]
+            from ParseTreeTransforms import DebuggerTransform
+            debug_transform = [DebuggerTransform(self, options.output_dir)]
         else:
             debug_transform = []
             

Cython/Compiler/ParseTreeTransforms.py

@@ -1476,11 +1476,13 @@ class DebuggerTransform(CythonTransform):
     enable debugging
     """
     
-    def __init__(self, context):
+    def __init__(self, context, output_dir):
         super(DebuggerTransform, self).__init__(context)
+        self.output_dir = os.path.join(output_dir, 'cython_debug')
+        
         if etree is None:
             raise Errors.NoElementTreeInstalledException()
-        else:
+        
         self.tb = etree.TreeBuilder()
         self.visited = set()
         
@@ -1564,7 +1566,7 @@ class DebuggerTransform(CythonTransform):
         xml_root_element = self.tb.close()
 
         try:
-            os.mkdir('cython_debug')
+            os.makedirs(self.output_dir)
         except OSError, e:
             if e.errno != errno.EEXIST:
                 raise
@@ -1573,8 +1575,8 @@ class DebuggerTransform(CythonTransform):
         kw = {}
         if have_lxml:
             kw['pretty_print'] = True
-        et.write("cython_debug/cython_debug_info_" + self.module_name, 
-                 encoding="UTF-8", 
-                 **kw)
+        
+        fn = "cython_debug_info_" + self.module_name
+        et.write(os.path.join(self.output_dir, fn), encoding="UTF-8", **kw)
             
         return root
\ No newline at end of file

Cython/Debugger/cygdb.py

@@ -6,6 +6,9 @@ The Cython debugger
 The current directory should contain a directory named 'cython_debug', or a
 path to the cython project directory should be given (the parent directory of
 cython_debug).
+
+Additional gdb args can be provided only if a path to the project directory is 
+given.
 """
 
 import os
@@ -14,7 +17,10 @@ import glob
 import tempfile
 import subprocess
 
-def main(import_libpython=False, path_to_debug_info=os.curdir):
+def usage():
+    print("Usage: cygdb [PATH GDB_ARGUMENTS]")
+
+def main(gdb_argv=[], import_libpython=False, path_to_debug_info=os.curdir):
     """
     Start the Cython debugger. This tells gdb to import the Cython and Python
     extensions (libpython.py and libcython.py) and it enables gdb's pending 
@@ -29,6 +35,7 @@ def main(import_libpython=False, path_to_debug_info=os.curdir):
         os.path.join(path_to_debug_info, 'cython_debug/cython_debug_info_*'))
 
     if not debug_files:
+        usage()
         sys.exit('No debug files were found in %s. Aborting.' % (
                  os.path.abspath(path_to_debug_info))) 
         
@@ -43,7 +50,7 @@ def main(import_libpython=False, path_to_debug_info=os.curdir):
     f.write('\n'.join('cy import %s\n' % fn for fn in debug_files))
     f.close()
 
-    p = subprocess.Popen(['gdb', '-command', tempfilename])
+    p = subprocess.Popen(['gdb', '-command', tempfilename] + gdb_argv)
     while True:
         try:
             p.wait()

Cython/Distutils/build_ext.py

@@ -204,6 +204,10 @@ class build_ext(_build_ext.build_ext):
             if rebuild:
                 log.info("cythoning %s to %s", source, target)
                 self.mkpath(os.path.dirname(target))
+                if self.inplace:
+                    output_dir = os.curdir
+                else:
+                    output_dir = self.build_lib
                 options = CompilationOptions(pyrex_default_options, 
                     use_listing_file = create_listing,
                     include_path = includes,
@@ -212,6 +216,7 @@ class build_ext(_build_ext.build_ext):
                     cplus = cplus,
                     emit_linenums = line_directives,
                     generate_pxi = pyrex_gen_pxi,
+                    output_dir = output_dir,
                     debug = pyrex_debug)
                 result = cython_compile(source, options=options,
                                         full_module_name=module_name)

bin/cygdb

@@ -6,6 +6,7 @@ from Cython.Debugger import cygdb
 
 if __name__ == '__main__':
     if len(sys.argv) > 1:
-        cygdb.main(path_to_debug_info=sys.argv[1])
+        cygdb.main(path_to_debug_info=sys.argv[1], 
+                   gdb_argv=sys.argv[2:])
     else:
         cygdb.main()

cygdb.py

@@ -6,6 +6,7 @@ from Cython.Debugger import cygdb
 
 if __name__ == '__main__':
     if len(sys.argv) > 1:
-        cygdb.main(path_to_debug_info=sys.argv[1])
+        cygdb.main(path_to_debug_info=sys.argv[1], 
+                   gdb_argv=sys.argv[2:])
     else:
         cygdb.main()