CODEWITHSUNDEEP
cmakefortrangfortran
xi luo
xi luo

Reputation: 1

How to set the environment variables in CMAKE？

I am trying to use Cmake to manage the dependencies of the Fortran and C code when I compiled the spectral solver. But it seems that Cmake cannot find the compiler although I have downloaded the Fortran and GCC already. This is the error I am getting. I hope there is someone who can tell me how to solve it.

the error screenshot

`CMake Error at /usr/share/cmake-3.16/Modules/CMakeDetermineCompiler.cmake:58 (set_property):
  set_property could not find CACHE variable CMAKE_Fortran_COMPILER.  Perhaps
  it has not yet been created.
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/CMakeDetermineFortranCompiler.cmake:96 (_cmake_find_compiler)
  CMakeLists.txt:109 (project)


-- The Fortran compiler identification is unknown
CMake Error at /usr/share/cmake-3.16/Modules/CMakeDetermineCompiler.cmake:58 (set_property):
  set_property could not find CACHE variable CMAKE_C_COMPILER.  Perhaps it
  has not yet been created.
Call Stack (most recent call first):
  /usr/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:65 (_cmake_find_compiler)
  CMakeLists.txt:109 (project)


-- The C compiler identification is unknown
CMake Error at CMakeLists.txt:109 (project):
  No CMAKE_Fortran_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "FC" or the CMake cache entry CMAKE_Fortran_COMPILER to the full
  path to the compiler, or to the compiler name if it is in the PATH.


CMake Error at CMakeLists.txt:109 (project):
  No CMAKE_C_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
  the compiler, or to the compiler name if it is in the PATH.`

CMakeLists.txt

Upvotes: 0

Views: 4455

Answers (1)

amateur_coder
amateur_coder

Reputation: 11

You need set the env variables. I used the following steps:

1: vim ~/.bashrc (to set the env variables)

2: Add the following statements export CC=/usr/bin/gcc (the path basically) and export FC=/usr/bin/gfortran

3 - Also make sure your path to PETSC_DIR and PETSC_ARCH is defined, add the following statements too, export PETSC_DIR = /path/to/petsc and export PETSC_ARCH = gfortran

4 - save and close the file

5 - Run this on command line - to read and execute the bash script source ~/.bashrc

Upvotes: 1

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