用make编译MPI，几个名称空间错误，例如"error: using name‘type“？

Question

我正试图在Xubuntu16.04LTS上编译MPI，我非常肯定，我已经安装了我所有的g++和gcc包含和库，但是我得到了这个奇怪的混乱.

    make[3]: Entering directory '/media/verthex/32gig/openmpi-3.1.2/oshmem/shmem/c/profile'
  LN_S     pshmem_init.c
  CC       pshmem_init.lo
In file included from ../../../../oshmem/include/shmem.h:26:0,
                 from ../../../../oshmem/include/oshmem/constants.h:15,
                 from pshmem_init.c:22:
/usr/local/include/complex.h:10:1: error: unknown type name ‘using’
 using namespace std;
 ^
/usr/local/include/complex.h:10:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘std’
 using namespace std;
                 ^
/usr/local/include/complex.h:13:17: fatal error: cmath: No such file or directory
compilation terminated.
Makefile:1950: recipe for target 'pshmem_init.lo' failed
make[3]: *** [pshmem_init.lo] Error 1
make[3]: Leaving directory '/media/verthex/32gig/openmpi-3.1.2/oshmem/shmem/c/profile'
Makefile:2012: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/media/verthex/32gig/openmpi-3.1.2/oshmem/shmem/c'
Makefile:2578: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/media/verthex/32gig/openmpi-3.1.2/oshmem'
Makefile:1897: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1

这是最后的配置输出。

Open MPI configuration:
-----------------------
Version: 3.1.2
Build MPI C bindings: yes
Build MPI C++ bindings (deprecated): no
Build MPI Fortran bindings: no
MPI Build Java bindings (experimental): no
Build Open SHMEM support: yes
Debug build: no
Platform file: (none)

Miscellaneous
-----------------------
CUDA support: no
PMIx support: internal

Transports
-----------------------
Cisco usNIC: no
Cray uGNI (Gemini/Aries): no
Intel Omnipath (PSM2): no
Intel SCIF: no
Intel TrueScale (PSM): no
Mellanox MXM: no
Open UCX: no
OpenFabrics Libfabric: no
OpenFabrics Verbs: yes
Portals4: no
Shared memory/copy in+copy out: yes
Shared memory/Linux CMA: yes
Shared memory/Linux KNEM: no
Shared memory/XPMEM: no
TCP: yes

Resource Managers
-----------------------
Cray Alps: no
Grid Engine: no
LSF: no
Moab: no
Slurm: yes
ssh/rsh: yes
Torque: no

Answer 1

因为，您正在尝试编译一个文件pshmem_init.c，它显然是一个C文件，而不是C++文件。make和编译器都将尝试编译以.c结尾为C的文件，除非您花费了非常长的时间来改变他们的想法。

在我看来，C文件pshmem_init.c包含了头部complex.h，意思是访问在/usr/include/complex.h中找到的标准C头文件，但是您已经以相同的名称(complex.h)向/usr/local/include中添加了一个C++头文件，并且要求编译器首先在那里查找(它将始终在默认的系统目录中查找最后一个)。

在这段代码编译之前，您必须解决这个问题。