c – 编译错误：`’error_category’没有用g 6.3.0命名类型`

2019年7月28日 115次阅读

我尝试编译这个C /
Python库
https://bitbucket.org/fluiddyn/fluidfft

如果安装了mpi4py,它运行良好.

如果未安装mpi4py,则无法编译不使用MPI的代码.

编译Cython文件时出现错误.错误很长,它开始于：

In file included from /usr/include/c++/6/bits/ios_base.h:46:0,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from src_cpp/base/base_fft.h:10,
                 from fluidfft/fft2d/fft2d_with_fftw1d.cpp:543:
/usr/include/c++/6/system_error:143:31: error: ‘error_category’ does not name a type
     error_code(int __v, const error_category& __cat) noexcept
                               ^~~~~~~~~~~~~~
/usr/include/c++/6/system_error:152:27: error: ‘error_category’ does not name a type
     assign(int __v, const error_category& __cat) noexcept
                           ^~~~~~~~~~~~~~
/usr/include/c++/6/system_error:172:11: error: ‘error_category’ does not name a type
     const error_category&
           ^~~~~~~~~~~~~~
/usr/include/c++/6/system_error:191:11: error: ‘error_category’ does not name a type
     const error_category*  _M_cat;

[...]

我想这可能是一个C 11问题(http://en.cppreference.com/w/cpp/error/error_category),但我没有看到如何解决问题.

编译命令是

g++ -pthread -fwrapv -O3 -Wall -Wno-unused-result -Wsign-compare -Wno-unused-result -Wsign-compare -fwrapv -O3 -Wall -fPIC -I/home/users/me/opt/miniconda3/include/python3.6m -I/home/users/me/opt/miniconda3/include -Isrc_cy -Ifluidfft/fft2d -Ifluidfft/fft3d -Isrc_cpp/base -Isrc_cpp/3d -Isrc_cpp/2d -Iinclude -I/home/users/me/opt/miniconda3/lib/python3.6/site-packages/numpy/core/include -c fluidfft/fft2d/fft2d_with_fftw1d.cpp -o build/temp.linux-x86_64-3.6/fluidfft/fft2d/fft2d_with_fftw1d.o

编辑最小,完整和可验证的示例

感谢Ashwin Vishnu(见https://bitbucket.org/fluiddyn/fluidfft/issues/7/fluidfft-installation-fails-without-mpi4py),我可以发布一个最小的例子

/* test.cpp */
#include <Python.h>
#include <string.h>
#include <stdio.h>

#include <cpu.h>

#include <sys/time.h>
#include <complex>
#include <iostream>


int main() {
  std::cout<<"Hello world";
  return 0;
}

从fluidfft目录编译如下：

g++ $(python-config --include) -Iinclude/ test.cpp

如果我们注释掉cpu.h include,就没有错误.

文件cpu.h取自pyfftw代码：https://github.com/pyFFTW/pyFFTW/blob/master/include/cpu.h

最佳答案 发生这种情况是因为包flowfft的Cython源文件依赖于
a C++ header file cpu.h,其中以下预处理器行导致了问题：

#if __STDC_VERSION__ >= 199901L
  /* "inline" is a keyword */
#else
# define inline
#endif

我的猜测是新编译器严格重新定义保留关键字.根据essay on inline functions的提示,这段代码被替换为：

#if __STDC_VERSION__ >= 199901L
  /* "inline" is a keyword */
#else
# define INLINE
#endif

#ifndef INLINE
# if __GNUC__ && !__GNUC_STDC_INLINE__
#  define INLINE static inline
# else
#  define INLINE inline
# endif
#endif
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