如何在Linux CentOS上更改默认的GCC编译器以用于MPI [英] How to change default GCC compiler to be used with MPI on Linux CentOS

问题描述

我在Linux（CentOS）机器上安装了两个GCC编译器。 GCC（4.4.7）的旧版本位于默认文件夹（随CentOS附带）中，而我打算使用的较新版本位于/usr/local/gcc/4.9.3/。我的代码使用了MPI和LAPACK / LAPACKE / BLAS库以及我用来编译源代码的旧GCC（例如main.cpp），如下所示：

mpiCC main.cpp -o main -L / home / USER1 / lapack-3.6.1 -llapacke -llapack -lblas -lm -Wall

仍然调用旧的GCC 4.4.7。我应该修改什么，以便上述MPI编译（mpiCC）从/usr/local/gcc/4.9.3/el6/bin/的新位置调用GCC 4.9.3可执行文件？

$ b $ MPICH安装程序指南3.2版（第6页）：

MPICH配置步骤将尝试为您找到C，C ++和Fortran编译器，但如果您想要覆盖缺省值或需要指定配置无法识别的编译器，可以在命令行中指定它们[...]。例如，要选择英特尔编译器而不是GNU编译器一个系统，使用

./ configure CC = icc CXX = icpc F77 = ifort FC = ifort ... $ b

有没有办法在 ./configure 中的不同版本的GCC编译器之间进行区分？ mpiCC 使用第一个 在 $ PATH 变量中找到gcc 编译器。

您应该能够设置新版本的gcc通过运行：

  PATH =/ usr / local / gcc / 4.9.3 / el6 / bin： $ PATHmpiCC main.cpp -o main -L / home / USER1 / lapack-3.6.1 -llapacke -llapack -lblas -lm -Wall 
  

I have two GCC compilers installed on a Linux (CentOS) machine. The old version of GCC (4.4.7) is in the default folder (came with CentOS) and the newer one that I intend to use is in /usr/local/gcc/4.9.3/. My code utilizes MPI and LAPACK/LAPACKE/BLAS libraries and with the old GCC I used to compile source (for example "main.cpp") like this:

mpiCC main.cpp -o main -L/home/USER1/lapack-3.6.1 -llapacke -llapack -lblas -lm –Wall

This still invokes the old GCC 4.4.7. What should I modify so the above MPI compilation (mpiCC) invokes GCC 4.9.3 executable from the new location at /usr/local/gcc/4.9.3/el6/bin/ ?

From MPICH Installer's Guide version 3.2 (page 6):

"The MPICH configure step will attempt to find the C, C++, and Fortran compilers for you, but if you either want to override the default or need to specify a compiler that configure doesn't recognize, you can specify them on the command line [...]. For example, to select the Intel compilers instead of the GNU compilers on a system with both, use"

./configure CC=icc CXX=icpc F77=ifort FC=ifort ...

Is there a way to dicriminate between different version of GCC compilers in ./configure ?

解决方案

I guess mpiCC uses the first gcc compiler found in the $PATH variable.

You should be able to set the new version of gcc by running:

PATH="/usr/local/gcc/4.9.3/el6/bin:$PATH" mpiCC main.cpp -o main -L/home/USER1/lapack-3.6.1 -llapacke -llapack -lblas -lm –Wall

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