How to mix C++ and Fortran using CMake -G Xcode? - c++

Question

I created a simple C++ file where I call a Fortran subroutine. Using CMake without the Xcode IDE everything compiles just fine, whereas trying to add the Xcode IDE with the command:
cmake .. -G Xcode
returns the following error:
Compilation of the Fortran compiler identification source "CMakeFortranCompilerId.F" did not produce an executable in ...
Somebody can give me a hint on how to debug this one?
The source files are given by:
CMakeLists.txt
cmake_minimum_required(VERSION 3.7.0)
project(mixing CXX Fortran)
add_executable(mixing
testC.cpp
testF.f
)
testC.cpp
#include <iostream>
using namespace std;
extern"C" {
void fortfunc_(int *ii, float *ff);
}
int main()
{
int ii=5;
float ff=5.5;
fortfunc_(&ii, &ff);
return 0;
}
testF.f
subroutine fortfunc(ii,ff)
integer ii
real*4 ff
write(6,100) ii, ff
100 format('ii=',i2,' ff=',f6.3)
return
end
CMakeFiles/CMakeError.log
Compilation of the Fortran compiler identification source "CMakeFortranCompilerId.F" did not produce an executable in "/Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran".
CMakeFiles/CMakeOutput.log
bins
cmake .. -G Xcode
cmake ..
difference between the two files
Compiling the Fortran compiler identification source file "CMakeFortranCompilerId.F" succeeded.
Compiler:
Build flags:
Id flags:
The output was:
0
=== BUILD TARGET CompilerIdFortran OF PROJECT CompilerIdFortran WITH THE DEFAULT CONFIGURATION (Debug) ===
Check dependencies
warning: no rule to process file '/Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CMakeFortranCompilerId.F' of type sourcecode.fortran.f90 for architecture x86_64
Write auxiliary files
write-file /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
chmod 0755 /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
PhaseScriptExecution Run\ Script CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
cd /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran
/bin/sh -c /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
GCC_VERSION=com.apple.compilers.llvm.clang.1_0
** BUILD SUCCEEDED **
Compiling the Fortran compiler identification source file "CMakeFortranCompilerId.F" succeeded.
Compiler:
Build flags:
Id flags:
The output was:
0
=== BUILD TARGET CompilerIdFortran OF PROJECT CompilerIdFortran WITH THE DEFAULT CONFIGURATION (Debug) ===
Check dependencies
warning: no rule to process file '/Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CMakeFortranCompilerId.F' of type sourcecode.fortran.f90 for architecture x86_64
Write auxiliary files
write-file /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
chmod 0755 /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
PhaseScriptExecution Run\ Script CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
cd /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran
/bin/sh -c /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/3.7.0/CompilerIdFortran/CompilerIdFortran.build/Debug/CompilerIdFortran.build/Script-2C8FEB8E15DC1A1A00E56A5D.sh
GCC_VERSION=com.apple.compilers.llvm.clang.1_0
** BUILD SUCCEEDED **
Compiling the Fortran compiler identification source file "CMakeFortranCompilerId.F" succeeded.
Compiler: /opt/local/bin/gfortran
Build flags:
Id flags: -v
The output was:
0
Driving: /opt/local/bin/gfortran -v CMakeFortranCompilerId.F -mmacosx-version-min=10.12.1 -l gfortran -shared-libgcc
Using built-in specs.
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/opt/local/bin/nm -n /var/folders/gn/07hkp3pd0r53c8sqglm6_3g40000gn/T//ccExsLaB.o
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Change Dir: /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/CMakeTmp
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arg [-L/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0/../../..] ==> dir [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0/../../..]
arg [-v] ==> ignore
arg [CMakeFiles/cmTC_61cbd.dir/CMakeFortranCompilerABI.F.o] ==> ignore
arg [-lgfortran] ==> lib [gfortran]
arg [-no_compact_unwind] ==> ignore
arg [-lSystem] ==> lib [System]
arg [-lgcc_ext.10.5] ==> lib [gcc_ext.10.5]
arg [-lgcc] ==> lib [gcc]
arg [-lquadmath] ==> lib [quadmath]
arg [-lm] ==> lib [m]
arg [-lgcc_ext.10.5] ==> lib [gcc_ext.10.5]
arg [-lgcc] ==> lib [gcc]
arg [-lSystem] ==> lib [System]
arg [-v] ==> ignore
Library search paths: [;/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0;/opt/local/lib/gcc6;/usr/lib;/usr/local/lib]
Framework search paths: [;/Library/Frameworks/;/System/Library/Frameworks/]
remove lib [System]
remove lib [gcc_ext.10.5]
remove lib [gcc]
remove lib [gcc_ext.10.5]
remove lib [gcc]
remove lib [System]
collapse library dir [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0] ==> [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0]
collapse library dir [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0/../../..] ==> [/opt/local/lib/gcc6]
collapse library dir [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0] ==> [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0]
collapse library dir [/opt/local/lib/gcc6] ==> [/opt/local/lib/gcc6]
collapse library dir [/usr/lib] ==> [/usr/lib]
collapse library dir [/usr/local/lib] ==> [/usr/local/lib]
collapse framework dir [/Library/Frameworks/] ==> [/Library/Frameworks]
collapse framework dir [/System/Library/Frameworks/] ==> [/System/Library/Frameworks]
implicit libs: [gfortran;quadmath;m]
implicit dirs: [/opt/local/lib/gcc6/gcc/x86_64-apple-darwin16/6.2.0;/opt/local/lib/gcc6;/usr/lib;/usr/local/lib]
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Determining if the Fortran compiler supports Fortran 90 passed with the following output:
Change Dir: /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/CMakeTmp
Run Build Command:"/usr/bin/make" "cmTC_e62a9/fast"
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/cmTC_e62a9.dir/build.make CMakeFiles/cmTC_e62a9.dir/build
Building Fortran object CMakeFiles/cmTC_e62a9.dir/testFortranCompilerF90.f90.o
/opt/local/bin/gfortran -c /Users/Knowledge/Developer/Tutorials/MixingFortranAndC/XCode_CMake_FortranMixing/build/CMakeFiles/CMakeTmp/testFortranCompilerF90.f90 -o CMakeFiles/cmTC_e62a9.dir/testFortranCompilerF90.f90.o
Linking Fortran executable cmTC_e62a9
/opt/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_e62a9.dir/link.txt --verbose=1
/opt/local/bin/gfortran CMakeFiles/cmTC_e62a9.dir/testFortranCompilerF90.f90.o -o cmTC_e62a9
CMAKE stdout
-- The CXX compiler identification is AppleClang 8.0.0.8000042
-- The Fortran compiler identification is unknown
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:2 (project):
No CMAKE_Fortran_COMPILER could be found.