如何用gcc编译MPI？ [英] How to compile MPI with gcc?

问题描述

有谁知道是否可以用 gcc ？编译MPI。我需要使用 gcc ，没有 mpicc 。

解决方案> mpicc 仅仅是一些编译器的一个包装。大多数实现都有它们的 mpicc 包装器，它们可以理解一个特殊选项，如 -showme （Open MPI）或 -show （打开MPI，MPICH和派生），给出了包装器传递给后端编译器的完整选项列表。

例如，在Open MPI中，包装器是C ++程序，用于读取纯文本配置文件并构建命令行选项，并将其传递给编译器。 mpicc -showme 显示了这些选项的完整列表：

  $ mpicc -showme 
 icc 
 -I / opt / MPI / openmpi-1.5.3 / linux / intel / include 
 -I /opt/MPI/openmpi-1.5.3/linux/intel/include/openmpi 
 -fexceptions 
 -pthread 
 -I / opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -Wl，-rpath，/ opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -I / opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -L ​​/ opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -lmpi 
 -ldl 
 -Wl， -  export-dynamic 
 -lnsl 
 -lutil 
  

（这是我在这里分割以改善的一条单线可读性）

特殊情况下，Intel C Compiler icc 用作后端编译器，但我们也有变体使用GCC。您还可以使用 mpicc -showme：compile 获取补全阶段所需的选项列表（通常称为 CFLAGS ） >：

$ mpicc -showme：compile
-I / opt / MPI / openmpi-1.5.3 / linux / intel / include
-I / opt / MPI / openmpi-1.5.3 / linux / intel / include / openmpi
-fexceptions
-pthread
-I / opt / MPI / openmpi-1.5.3 / linux / intel / lib


作为需要传递给链接器的选项列表（称为 LDFLAGS ），其中 mpicc -showme：link ：

  $ mpicc -showme：link 
 -fexceptions 
 -pthread 
 -I / opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -Wl，-rpath，/ opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -I / opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -L ​​/ opt / MPI / openmpi-1.5.3 / linux / intel / lib 
 -lmpi 
 -ldl 
 -Wl， -  export-dynamic 
 -lnsl 
 -lutil 
  

这些都可以使用，例如在 Makefile 中，像这样：

  ... 
 CFLAGS + = $（shell mpicc -showme：compile）
 LDFLAGS + = $（shell mpicc -showme：link）
 ... 
  
 
 $ b 
据我所知 -showme：compile 和 -showme：link 特定于Open MPI，其他实现仅在 -show 调用时提供完整选项列表。
 
 
 
我仍然认为直接使用 mpicc 会更好，因为如果MPI设置中的某些内容发生更改，它会立即反映在包装中，而你必须手动更改构建脚本/  Makefile （除非使用 -showme：compile 和 -showme：link 自动获取选项）。
 
Does anyone know if it is possible to compile MPI with gcc?. I need to use gcc, no mpicc.
解决方案
mpicc is just a wrapper around certain set of compilers. Most implementations have their mpicc wrappers understand a special option like -showme (Open MPI) or -show (Open MPI, MPICH and derivates) that gives the full list of options that the wrapper passes on to the backend compiler.

For example, in Open MPI, wrappers are C++ programs that read plain text configuration files and build command line options that are further passed on to the compiler. mpicc -showme shows the full list of such options:
$ mpicc -showme
icc
-I/opt/MPI/openmpi-1.5.3/linux/intel/include
-I/opt/MPI/openmpi-1.5.3/linux/intel/include/openmpi
-fexceptions
-pthread
-I/opt/MPI/openmpi-1.5.3/linux/intel/lib
-Wl,-rpath,/opt/MPI/openmpi-1.5.3/linux/intel/lib
-I/opt/MPI/openmpi-1.5.3/linux/intel/lib
-L/opt/MPI/openmpi-1.5.3/linux/intel/lib
-lmpi
-ldl
-Wl,--export-dynamic
-lnsl
-lutil
(it's really a single line that I have split here to improve readability)

It that particular case Intel C Compiler icc is used as the backend compiler but we also have variants that use GCC. You can also get the list of options needed for the comple phase (usually known as CFLAGS) with mpicc -showme:compile:
$ mpicc -showme:compile
-I/opt/MPI/openmpi-1.5.3/linux/intel/include
-I/opt/MPI/openmpi-1.5.3/linux/intel/include/openmpi
-fexceptions
-pthread
-I/opt/MPI/openmpi-1.5.3/linux/intel/lib
as well as the list of options that you need to pass to the linker (known as LDFLAGS) with mpicc -showme:link:
$ mpicc -showme:link
-fexceptions
-pthread
-I/opt/MPI/openmpi-1.5.3/linux/intel/lib
-Wl,-rpath,/opt/MPI/openmpi-1.5.3/linux/intel/lib
-I/opt/MPI/openmpi-1.5.3/linux/intel/lib
-L/opt/MPI/openmpi-1.5.3/linux/intel/lib
-lmpi
-ldl
-Wl,--export-dynamic
-lnsl
-lutil
These could be used, e.g. in a Makefile, like this:
...
CFLAGS += $(shell mpicc -showme:compile)
LDFLAGS += $(shell mpicc -showme:link)
...
As far as I know -showme:compile and -showme:link are specific to Open MPI and other implementations only give the full list of options when called with -show.

I still think it's better to use mpicc directly because if it happens that something in the MPI setup is changed, it will be immediately reflected in the wrapper while you would have to change your build script / Makefile manually (unless you use -showme:compile and -showme:link to obtain the options automatically).

                        
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