I don’t know if this a bug, principally not possible or if I’m doing something wrong.
I have a C,C++,Fortran cmake project which builds nicely with Apple clang and gfortran from brew on macOS.
Usually I use Eclipse with external make project but now I want to try Xcode.
I need to give the compilers and run
cmake -G Xcode -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang -DCMAKE_Fortran_COMPILER=gfortran ..
and get
-- Using CMake 3.26.3 with generator Xcode
-- The C compiler identification is AppleClang 15.0.0.15000309
-- The CXX compiler identification is AppleClang 15.0.0.15000309
-- The Fortran compiler identification is unknown
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Checking whether Fortran compiler has -isysroot
-- Checking whether Fortran compiler has -isysroot - yes
-- Checking whether Fortran compiler supports OSX deployment target flag
-- Checking whether Fortran compiler supports OSX deployment target flag - yes
-- Detecting Fortran compiler ABI info
-- Detecting Fortran compiler ABI info - failed
-- Check for working Fortran compiler: /opt/homebrew/bin/gfortran
-- Check for working Fortran compiler: /opt/homebrew/bin/gfortran - broken
CMake Error at /opt/homebrew/Cellar/cmake/3.26.3/share/cmake/Modules/CMakeTestFortranCompiler.cmake:59 (message):
The Fortran compiler
"/opt/homebrew/bin/gfortran"
is not able to compile a simple test program.
It fails with the following output:
Change Dir: /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY
Run Build Command(s):/usr/bin/xcodebuild -project CMAKE_TRY_COMPILE.xcodeproj build -target cmTC_03712 -parallelizeTargets -configuration Debug -hideShellScriptEnvironment && Command line invocation:
/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -project CMAKE_TRY_COMPILE.xcodeproj build -target cmTC_03712 -parallelizeTargets -configuration Debug -hideShellScriptEnvironment
User defaults from command line:
HideShellScriptEnvironment = YES
IDEPackageSupportUseBuiltinSCM = YES
ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (1 target)
Target 'cmTC_03712' in project 'CMAKE_TRY_COMPILE' (no dependencies)
GatherProvisioningInputs
CreateBuildDescription
ExecuteExternalTool /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -v -E -dM -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.5.sdk -x c -c /dev/null
Build description signature: 76ea46e32cab0d3dddb69af387d79758
Build description path: /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/build/XCBuildData/76ea46e32cab0d3dddb69af387d79758.xcbuilddata
CreateBuildDirectory /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/Debug
cd /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/CMAKE_TRY_COMPILE.xcodeproj
builtin-create-build-directory /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/Debug
CreateBuildDirectory /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/build
cd /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/CMAKE_TRY_COMPILE.xcodeproj
builtin-create-build-directory /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/build
ClangStatCache /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang-stat-cache /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.5.sdk /var/folders/q5/g9j2r7ps5tz94gkrhf85mqbr0000gn/C/com.apple.DeveloperTools/15.4-15F31d/Xcode/SDKStatCaches.noindex/macosx14.5-23F73-7e3fd6dc4171e65dbd154ba8db3956d2.sdkstatcache
cd /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/CMAKE_TRY_COMPILE.xcodeproj
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang-stat-cache /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.5.sdk -o /var/folders/q5/g9j2r7ps5tz94gkrhf85mqbr0000gn/C/com.apple.DeveloperTools/15.4-15F31d/Xcode/SDKStatCaches.noindex/macosx14.5-23F73-7e3fd6dc4171e65dbd154ba8db3956d2.sdkstatcache
CreateBuildDirectory /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/build/EagerLinkingTBDs/Debug
cd /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/CMAKE_TRY_COMPILE.xcodeproj
builtin-create-build-directory /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/build/EagerLinkingTBDs/Debug
RegisterExecutionPolicyException /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/Debug/cmTC_03712 (in target 'cmTC_03712' from project 'CMAKE_TRY_COMPILE')
cd /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY
builtin-RegisterExecutionPolicyException /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/Debug/cmTC_03712
error: Build input file cannot be found: '/Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/Debug/cmTC_03712'. Did you forget to declare this file as an output of a script phase or custom build rule which produces it? (in target 'cmTC_03712' from project 'CMAKE_TRY_COMPILE')
warning: no rule to process file '/Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/testFortranCompiler.f' of type 'sourcecode.fortran.f90' for architecture 'arm64' (in target 'cmTC_03712' from project 'CMAKE_TRY_COMPILE')
** BUILD FAILED **
The following build commands failed:
RegisterExecutionPolicyException /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/TryCompile-xSyBNY/Debug/cmTC_03712 (in target 'cmTC_03712' from project 'CMAKE_TRY_COMPILE')
(1 failure)
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:59 (project)
-- Configuring incomplete, errors occurred!
I cannot reproduce, as /Users/fwein/code/cfs/xcode/CMakeFiles/CMakeScratch/ is empty.
/opt/homebrew/bin/gfortran is the correct compiler, I use for the default Unix Makefiles generator