我无法使用Python3.4.0在虚拟环境中安装pylibmc

Question

首先，我使用了Ubuntu17.10，并下载了python-python3.4.0的早期版本，因为我的项目需要这个旧版本。我安装了memcached、libmemcached-dev和--我可以在基于python3.6.3.的虚拟env中安装，而无需发出任何问题。

然而，在基于pylibmc的环境中安装Python 3.4.0时，我得到了错误：

    Collecting pylibmc==1.5.1 (from -r requirements.txt (line 2))
  Using cached https://files.pythonhosted.org/packages/23/f4/3904b7171e61a83eafee0ed3b1b8efe4d3c6ddc05f7ebdff1831cf0e15f1/pylibmc-1.5.1.tar.gz
Building wheels for collected packages: pylibmc
  Running setup.py bdist_wheel for pylibmc ... error
  Complete output from command /home/przemek/usosApi34/bin/python3.4 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-859hcscx/pylibmc/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d /tmp/pip-wheel-_u6qlw_7 --python-tag cp34:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.4
  creating build/lib.linux-x86_64-3.4/pylibmc
  copying src/pylibmc/__main__.py -> build/lib.linux-x86_64-3.4/pylibmc
  copying src/pylibmc/__init__.py -> build/lib.linux-x86_64-3.4/pylibmc
  copying src/pylibmc/client.py -> build/lib.linux-x86_64-3.4/pylibmc
  copying src/pylibmc/consts.py -> build/lib.linux-x86_64-3.4/pylibmc
  copying src/pylibmc/test.py -> build/lib.linux-x86_64-3.4/pylibmc
  copying src/pylibmc/pools.py -> build/lib.linux-x86_64-3.4/pylibmc
  running build_ext
  building '_pylibmc' extension
  creating build/temp.linux-x86_64-3.4
  creating build/temp.linux-x86_64-3.4/src
  gcc -pthread -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DUSE_ZLIB -I/home/przemek/opt/python-3.4.0/include/python3.4m -c src/_pylibmcmodule.c -o build/temp.linux-x86_64-3.4/src/_pylibmcmodule.o -fno-strict-aliasing -std=c99
  src/_pylibmcmodule.c: In function ‘PylibMC_Client_init’:
  src/_pylibmcmodule.c:209:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
       int native_serialization, native_deserialization;
       ^~~
  src/_pylibmcmodule.c: In function ‘_PylibMC_deserialize_native’:
  src/_pylibmcmodule.c:642:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
       PyObject *retval = NULL;
       ^~~~~~~~
  src/_pylibmcmodule.c: In function ‘PylibMC_Client_gets’:
  src/_pylibmcmodule.c:785:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
       int miss = 0;
       ^~~
  src/_pylibmcmodule.c: In function ‘_PylibMC_SerializeValue’:
  src/_pylibmcmodule.c:1168:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
       int success;
       ^~~
  src/_pylibmcmodule.c: In function ‘_PylibMC_serialize_native’:
  src/_pylibmcmodule.c:1247:9: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
           const char *value_str = (value_obj == Py_True) ? "1" : "0";
           ^~~~~
  src/_pylibmcmodule.c:1252:9: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
           PyObject *tmp = PyObject_Str(value_obj);
           ^~~~~~~~
  src/_pylibmcmodule.c: In function ‘PylibMC_Client_get_multi’:
  src/_pylibmcmodule.c:1793:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
       Py_ssize_t key_idx = 0;
       ^~~~~~~~~~
  cc1: some warnings being treated as errors
  error: command 'gcc' failed with exit status 1

  ----------------------------------------
  Failed building wheel for pylibmc
  Running setup.py clean for pylibmc
Failed to build pylibmc
Installing collected packages: pylibmc
  Running setup.py install for pylibmc ... error
    Complete output from command /home/przemek/usosApi34/bin/python3.4 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-859hcscx/pylibmc/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-1r6f9jsj/install-record.txt --single-version-externally-managed --compile --install-headers /home/przemek/usosApi34/include/site/python3.4/pylibmc:
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-3.4
    creating build/lib.linux-x86_64-3.4/pylibmc
    copying src/pylibmc/__main__.py -> build/lib.linux-x86_64-3.4/pylibmc
    copying src/pylibmc/__init__.py -> build/lib.linux-x86_64-3.4/pylibmc
    copying src/pylibmc/client.py -> build/lib.linux-x86_64-3.4/pylibmc
    copying src/pylibmc/consts.py -> build/lib.linux-x86_64-3.4/pylibmc
    copying src/pylibmc/test.py -> build/lib.linux-x86_64-3.4/pylibmc
    copying src/pylibmc/pools.py -> build/lib.linux-x86_64-3.4/pylibmc
    running build_ext
    building '_pylibmc' extension
    creating build/temp.linux-x86_64-3.4
    creating build/temp.linux-x86_64-3.4/src
    gcc -pthread -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -DUSE_ZLIB -I/home/przemek/opt/python-3.4.0/include/python3.4m -c src/_pylibmcmodule.c -o build/temp.linux-x86_64-3.4/src/_pylibmcmodule.o -fno-strict-aliasing -std=c99
    src/_pylibmcmodule.c: In function ‘PylibMC_Client_init’:
    src/_pylibmcmodule.c:209:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
         int native_serialization, native_deserialization;
         ^~~
    src/_pylibmcmodule.c: In function ‘_PylibMC_deserialize_native’:
    src/_pylibmcmodule.c:642:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
         PyObject *retval = NULL;
         ^~~~~~~~
    src/_pylibmcmodule.c: In function ‘PylibMC_Client_gets’:
    src/_pylibmcmodule.c:785:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
         int miss = 0;
         ^~~
    src/_pylibmcmodule.c: In function ‘_PylibMC_SerializeValue’:
    src/_pylibmcmodule.c:1168:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
         int success;
         ^~~
    src/_pylibmcmodule.c: In function ‘_PylibMC_serialize_native’:
    src/_pylibmcmodule.c:1247:9: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
             const char *value_str = (value_obj == Py_True) ? "1" : "0";
             ^~~~~
    src/_pylibmcmodule.c:1252:9: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
             PyObject *tmp = PyObject_Str(value_obj);
             ^~~~~~~~
    src/_pylibmcmodule.c: In function ‘PylibMC_Client_get_multi’:
    src/_pylibmcmodule.c:1793:5: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
         Py_ssize_t key_idx = 0;
         ^~~~~~~~~~
    cc1: some warnings being treated as errors
    error: command 'gcc' failed with exit status 1

    ----------------------------------------
Command "/home/przemek/usosApi34/bin/python3.4 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-859hcscx/pylibmc/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-1r6f9jsj/install-record.txt --single-version-externally-managed --compile --install-headers /home/przemek/usosApi34/include/site/python3.4/pylibmc" failed with error code 1 in /tmp/pip-install-859hcscx/pylibmc/

你知道有什么问题吗？

Answer 1

这与Python 3.4中的一个bug有关，它意外地将CFLAG设置为包含所有构建步骤的-Werror=declaration-after-statement。您所看到的错误是设置此标志的结果。解决方案是在pip install期间手动取消它。

CFLAGS=-Wno-error=declaration-after-statement pip install pylibmc==1.5.1