fix build with python-2.7.5 (#20137)
Summary:
pytorch failed to build with the following error, complaining about the first regex match
It may be caused by a bug in python 2.7.5
This change proposed is a workaround for building pytorch with python 2.7.5
Since the '*' star notation is greedy in python regex, the new expression shall produce the identical result with the old one.
```
Traceback (most recent call last):
File "/data2/nihuini/pytorch/cmake/../aten/src/ATen/gen.py", line 14, in <module>
import preprocess_declarations
File "/data2/nihuini/pytorch/aten/src/ATen/preprocess_declarations.py", line 3, in <module>
from function_wrapper import TYPE_FORMAL_GENERIC
File "/data2/nihuini/pytorch/aten/src/ATen/function_wrapper.py", line 5, in <module>
from code_template import CodeTemplate
File "/data2/nihuini/pytorch/aten/src/ATen/code_template.py", line 13, in <module>
class CodeTemplate(object):
File "/data2/nihuini/pytorch/aten/src/ATen/code_template.py", line 23, in CodeTemplate
subtitution = re.compile(substitution_str, re.MULTILINE)
File "/usr/lib64/python2.7/re.py", line 190, in compile
return _compile(pattern, flags)
File "/usr/lib64/python2.7/re.py", line 242, in _compile
raise error, v # invalid expression
sre_constants.error: nothing to repeat
--
CMake Error at cmake/Codegen.cmake:162 (message):
Failed to get generated_cpp list
Call Stack (most recent call first):
caffe2/CMakeLists.txt:2 (include)
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20137
Differential Revision: D15218122
Pulled By: ezyang
fbshipit-source-id: 10b618ff92a04e9074f5d83e31411fc2341e0cf8
