I would like to try to use 64-bit gfortran to compile a project in which the
rest of the code is compiled with Visual C++ 2017. I've read the netlib article
(http://www.netlib.org/lapack/lawnspdf/lawn270.pdf) but it doesn't address my
problem, which is how to help CMake select the right Fortran compiler. The
CMakeLists.txt file is launched from within Qt Creator.
My CMakeLists.txt file (which I've tested thoroughly using gfortran in Linux
and MinGW gfortran on Windows) begins:
cmake_minimum_required(VERSION 3.12)
project(myProj LANGUAGES Fortran)
...and if I set Qt Creator to parse it with the MSVC compiler option selected,
the output is:
Starting to parse CMake project, using:
"-DCMAKE_CXX_COMPILER:STRING=C:/Program Files (x86)/Microsoft Visual
Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/HostX86/x64/cl.exe",
"-DCMAKE_C_COMPILER:STRING=C:/Program Files (x86)/Microsoft Visual
Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/HostX86/x64/cl.exe",
"-DCMAKE_PREFIX_PATH:STRING=C:/Qt/5.9.7/msvc2017_64",
"-DQT_QMAKE_EXECUTABLE:STRING=C:/Qt/5.9.7/msvc2017_64/bin/qmake.exe".
The Fortran compiler identification is unknown
CMake Error at CMakeLists.txt:2 (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.
Fair enough; here's my second attempt:
cmake_minimum_required(VERSION 3.12)
set(CMAKE_Fortran_COMPILER "C:/Qt/Tools/mingw730_64/bin/gfortran.exe")
project(myProj LANGUAGES Fortran)
...and this gives me:
Starting to parse CMake project, using:
"-DCMAKE_CXX_COMPILER:STRING=C:/Program Files (x86)/Microsoft Visual
Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/HostX86/x64/cl.exe",
"-DCMAKE_C_COMPILER:STRING=C:/Program Files (x86)/Microsoft Visual
Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/HostX86/x64/cl.exe",
"-DCMAKE_PREFIX_PATH:STRING=C:/Qt/5.9.7/msvc2017_64",
"-DQT_QMAKE_EXECUTABLE:STRING=C:/Qt/5.9.7/msvc2017_64/bin/qmake.exe".
The Fortran compiler identification is unknown
Check for working Fortran compiler: C:/Qt/Tools/mingw730_64/bin/gfortran.exe
CMake Error: Error required internal CMake variable not set, cmake may not
be built correctly.
Missing variable is:
CMAKE_Fortran_PREPROCESS_SOURCE
CMake Error at C:/Program
Files/CMake/share/cmake-3.12/Modules/CMakeTestFortranCompiler.cmake:30
(try_compile):
Failed to generate test project build system.
Call Stack (most recent call first):
CMakeLists.txt:3 (project)
In place of the "set(CMAKE_Fortran_COMPILER..." line I've also tried
set($ENV{FC} "C:/Qt/Tools/mingw730_64/bin/gfortran.exe")
...which gave me the error message
Could not find compiler set in environment variable FC:
CMAKE_Fortran_COMPILER-NOTFOUND
..and
set($ENV{FC} "C:/Qt/Tools/mingw730_64/bin")
... which gave me exactly the same error as I got in the first case.
So what am I doing wrong here?
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