python - 使用 Python 3.6 执行 make install 时出现警告

Question

我下载了 python 3.6 并尝试执行通常的./configure && make install

我收到这些警告:

/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c: In function 'classify_argument':
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:195:18: warning: suggest braces around empty body in an 'else' statement [-Wempty-body]
    FFI_ASSERT (0);
                  ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:224:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < words; i++)
                ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:245:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (i = 0; i < num; i++)
                    ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:264:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (i = 1; i < words; i++)
                    ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:270:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (i = 0; i < words; i++)
                ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c: In function 'examine_argument':
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:323:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 0; i < n; ++i)
                 ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c: In function 'ffi_call':
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:484:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (j = 0; j < n; j++, a += 8, size -= 8)
                  ^
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c: In function 'ffi_closure_unix64_inner':
/usr/src/Python-3.6.0/Modules/_ctypes/libffi/src/x86/ffi64.c:659:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (j = 0; j < n; j++, a += 8)
                  ^

有什么需要我小心处理的吗？

Answer 1

已解决安装这些软件包的问题:

sudo apt-get install libffi6 libffi-dev

然后我可以像平常一样安装 Python 3.6:

PYTHON_VERSION=3.6.0    
wget "https://www.python.org/ftp/python/$PYTHON_VERSION/Python-$PYTHON_VERSION.tgz" \
  && tar xzf "Python-$PYTHON_VERSION.tgz" \
  && cd "Python-$PYTHON_VERSION" \
  && ./configure > /dev/null \
  && make altinstall > /dev/null 

出于文档目的:我使用 altinstall 来保留 Python 2.7(预安装在 ubuntu 16.10 上)并能够使用 Python 3.x。

我可以为“旧”python 开具发票:

python

或者新的Python

python3.6