[0.29] implement the --depfile command-line option for the "cython" tool (GH-4949)release

Backports https://github.com/cython/cython/pull/4916

1 files changed, 2 insertions, 17 deletions

diff --git a/Cython/Build/Dependencies.py b/Cython/Build/Dependencies.py
index 7eb55e260..1ba574d52 100644
--- a/Cython/Build/Dependencies.py
+++ b/Cython/Build/Dependencies.py
@@ -43,7 +43,7 @@ except:
     pythran = None
 
 from .. import Utils
-from ..Utils import (cached_function, cached_method, path_exists,
+from ..Utils import (cached_function, cached_method, path_exists, write_depfile,
     safe_makedirs, copy_file_to_dir_if_newer, is_package_dir, replace_suffix)
 from ..Compiler.Main import Context, CompilationOptions, default_options
 
@@ -1030,22 +1030,7 @@ def cythonize(module_list, exclude=None, nthreads=0, aliases=None, quiet=False,
                 # write out the depfile, if requested
                 if depfile:
                     dependencies = deps.all_dependencies(source)
-                    src_base_dir, _ = os.path.split(source)
-                    if not src_base_dir.endswith(os.sep):
-                        src_base_dir += os.sep
-                    # paths below the base_dir are relative, otherwise absolute
-                    paths = []
-                    for fname in dependencies:
-                        if (fname.startswith(src_base_dir) or
-                            fname.startswith('.' + os.path.sep)):
-                            paths.append(os.path.relpath(fname, src_base_dir))
-                        else:
-                            paths.append(os.path.abspath(fname))
-
-                    depline = os.path.split(c_file)[1] + ": \\\n  "
-                    depline += " \\\n  ".join(paths) + "\n"
-                    with open(c_file+'.dep', 'w') as outfile:
-                        outfile.write(depline)
+                    write_depfile(c_file, source, dependencies)
 
                 if os.path.exists(c_file):
                     c_timestamp = os.path.getmtime(c_file)