Numpy: [BUG]如果首先生成C源代码，则f2py无法编译扩展模块

遵循f2py的docs / User Guide，如果要使用扩展模块生成.c文件，则必须执行

$ f2py -m fib1 fib1.f

生成一个fib1module.c文件。 这可行。 但是，根据文档，将扩展模块构建为可在Python中导入的下一步是

$ f2py -c fib1module.c

但是，这对我来说失败，并显示以下消息：

$ f2py -c fib1module.c --verbose
running build
running config_cc
unifing config_cc, config, build_clib, build_ext, build commands --compiler options
running config_fc
unifing config_fc, config, build_clib, build_ext, build commands --fcompiler options
running build_src
build_src
building extension "untitled" sources
build_src: building npy-pkg config files
running build_ext
new_compiler returns <class 'distutils.unixccompiler.UnixCCompiler'>
customize UnixCCompiler
customize UnixCCompiler using build_ext
********************************************************************************
<class 'distutils.unixccompiler.UnixCCompiler'>
preprocessor  = ['gcc', '-pthread', '-B', '/opt/miniconda/envs/numpy-dev/compiler_compat', '-Wl,--sysroot=/', '-E']
compiler      = ['gcc', '-pthread', '-B', '/opt/miniconda/envs/numpy-dev/compiler_compat', '-Wl,--sysroot=/', '-Wsign-compare', '-DNDEBUG', '-g', '-fwrapv', '-O3', '-Wall', '-Wstrict-prototypes', '-std=c99']
compiler_so   = ['gcc', '-pthread', '-B', '/opt/miniconda/envs/numpy-dev/compiler_compat', '-Wl,--sysroot=/', '-Wsign-compare', '-DNDEBUG', '-g', '-fwrapv', '-O3', '-Wall', '-Wstrict-prototypes', '-fPIC', '-std=c99']
compiler_cxx  = ['g++', '-pthread', '-B', '/opt/miniconda/envs/numpy-dev/compiler_compat', '-Wl,--sysroot=/']
linker_so     = ['gcc', '-pthread', '-shared', '-B', '/opt/miniconda/envs/numpy-dev/compiler_compat', '-L/opt/miniconda/envs/numpy-dev/lib', '-Wl,-rpath=/opt/miniconda/envs/numpy-dev/lib', '-Wl,--no-as-needed', '-Wl,--sysroot=/']
linker_exe    = ['gcc', '-pthread', '-B', '/opt/miniconda/envs/numpy-dev/compiler_compat', '-Wl,--sysroot=/']
archiver      = ['ar', 'rc']
ranlib        = None
libraries     = []
library_dirs  = []
include_dirs  = ['/opt/miniconda/envs/numpy-dev/include/python3.6m']
********************************************************************************
building 'untitled' extension
compiling C sources
C compiler: gcc -pthread -B /opt/miniconda/envs/numpy-dev/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -std=c99

compile options: '-I/home/melissa/projects/numpy/numpy/core/include -I/opt/miniconda/envs/numpy-dev/include/python3.6m -c'
gcc: fib1module.c
fib1module.c:16:10: fatal error: fortranobject.h: Arquivo ou diretório inexistente
   16 | #include "fortranobject.h"
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.
error: Command "gcc -pthread -B /opt/miniconda/envs/numpy-dev/compiler_compat -Wl,--sysroot=/ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -std=c99 -I/home/melissa/projects/numpy/numpy/core/include -I/opt/miniconda/envs/numpy-dev/include/python3.6m -c fib1module.c -o /tmp/tmpyjgu4iq5/fib1module.o -MMD -MF /tmp/tmpyjgu4iq5/fib1module.o.d" failed with exit status 1

在做

$ f2py -c fib1module.c -I/home/melissa/projects/numpy/numpy/f2py/src -m fib1module

似乎可以工作（这是我的fortranobject.h文件的位置），但是该模块不可导入：

>>> import fib1module
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: /home/melissa/projects/numpy/doc/source/f2py/fib1module.cpython-36m-x86_64-linux-gnu.so: undefined symbol: PyFortran_Type

TL; DR：这是一个错误，还是我们不应该做的事情（生成.c源，然后在一个单独的步骤中构建扩展模块）？

>>> import sys, numpy; print(numpy.__version__, sys.version)
1.18.0.dev0+8d217b0 3.6.7 | packaged by conda-forge | (default, Jul  2 2019, 02:18:42) 
[GCC 7.3.0]