Wrong compiler use on OSX with cmake --workflow gcc-...

[ClausKlein]

I want to test with gcc-15 on OSX, but the AppleClang compiler is used?

bash-5.2$ cmake --workflow gcc-debug --fresh 
Executing workflow step 1 of 3: configure preset "gcc-debug"

-- The CXX compiler identification is AppleClang 16.0.0.16000026
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- The C compiler identification is AppleClang 16.0.0.16000026
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
-- Found Threads: TRUE
-- Looking for __cpp_lib_ranges
-- Looking for __cpp_lib_ranges - found
-- Examples to be built: identity_direct_usage;identity_as_default_projection
-- Configuring done (6.8s)
-- Generating done (0.0s)
-- Build files have been written to: /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug

Executing workflow step 2 of 3: build preset "gcc-debug"

[1/13] Building CXX object src/beman/exemplar/CMakeFiles/beman.exemplar_verify_interface_header_sets.dir/beman.exemplar_verify_interface_header_sets/beman/exemplar/identity.hpp.cxx.o
FAILED: [code=1] src/beman/exemplar/CMakeFiles/beman.exemplar_verify_interface_header_sets.dir/beman.exemplar_verify_interface_header_sets/beman/exemplar/identity.hpp.cxx.o 
ccache /usr/bin/g++  -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/src/beman/exemplar/../../../include -x c++ -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=gnu++20 -MD -MT src/beman/exemplar/CMakeFiles/beman.exemplar_verify_interface_header_sets.dir/beman.exemplar_verify_interface_header_sets/beman/exemplar/identity.hpp.cxx.o -MF src/beman/exemplar/CMakeFiles/beman.exemplar_verify_interface_header_sets.dir/beman.exemplar_verify_interface_header_sets/beman/exemplar/identity.hpp.cxx.o.d -o src/beman/exemplar/CMakeFiles/beman.exemplar_verify_interface_header_sets.dir/beman.exemplar_verify_interface_header_sets/beman/exemplar/identity.hpp.cxx.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/src/beman/exemplar/beman.exemplar_verify_interface_header_sets/beman/exemplar/identity.hpp.cxx
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
[2/13] Building CXX object examples/CMakeFiles/beman.exemplar.examples.identity_as_default_projection.dir/identity_as_default_projection.cpp.o
FAILED: [code=1] examples/CMakeFiles/beman.exemplar.examples.identity_as_default_projection.dir/identity_as_default_projection.cpp.o 
ccache /usr/bin/g++  -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/src/beman/exemplar/../../../include -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=gnu++20 -MD -MT examples/CMakeFiles/beman.exemplar.examples.identity_as_default_projection.dir/identity_as_default_projection.cpp.o -MF examples/CMakeFiles/beman.exemplar.examples.identity_as_default_projection.dir/identity_as_default_projection.cpp.o.d -o examples/CMakeFiles/beman.exemplar.examples.identity_as_default_projection.dir/identity_as_default_projection.cpp.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/examples/identity_as_default_projection.cpp
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
[3/13] Building CXX object _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o
FAILED: [code=1] _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o 
ccache /usr/bin/g++  -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest/include -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=c++20  -DGTEST_HAS_PTHREAD=1 -MD -MT _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o -MF _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o.d -o _deps/googletest-build/googletest/CMakeFiles/gtest.dir/src/gtest-all.cc.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest/src/gtest-all.cc
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
[4/13] Building CXX object src/beman/exemplar/CMakeFiles/beman.exemplar.dir/identity.cpp.o
FAILED: [code=1] src/beman/exemplar/CMakeFiles/beman.exemplar.dir/identity.cpp.o 
ccache /usr/bin/g++  -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/src/beman/exemplar/../../../include -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=gnu++20 -MD -MT src/beman/exemplar/CMakeFiles/beman.exemplar.dir/identity.cpp.o -MF src/beman/exemplar/CMakeFiles/beman.exemplar.dir/identity.cpp.o.d -o src/beman/exemplar/CMakeFiles/beman.exemplar.dir/identity.cpp.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/src/beman/exemplar/identity.cpp
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
[5/13] Building CXX object tests/beman/exemplar/CMakeFiles/beman.exemplar.tests.identity.dir/identity.test.cpp.o
FAILED: [code=1] tests/beman/exemplar/CMakeFiles/beman.exemplar.tests.identity.dir/identity.test.cpp.o 
ccache /usr/bin/g++  -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/src/beman/exemplar/../../../include -isystem /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest/include -isystem /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=gnu++20 -MD -MT tests/beman/exemplar/CMakeFiles/beman.exemplar.tests.identity.dir/identity.test.cpp.o -MF tests/beman/exemplar/CMakeFiles/beman.exemplar.tests.identity.dir/identity.test.cpp.o.d -o tests/beman/exemplar/CMakeFiles/beman.exemplar.tests.identity.dir/identity.test.cpp.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/tests/beman/exemplar/identity.test.cpp
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
[6/13] Building CXX object examples/CMakeFiles/beman.exemplar.examples.identity_direct_usage.dir/identity_direct_usage.cpp.o
FAILED: [code=1] examples/CMakeFiles/beman.exemplar.examples.identity_direct_usage.dir/identity_direct_usage.cpp.o 
ccache /usr/bin/g++  -I/Users/clausklein/Workspace/cpp/beman-project/exemplar/src/beman/exemplar/../../../include -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=gnu++20 -MD -MT examples/CMakeFiles/beman.exemplar.examples.identity_direct_usage.dir/identity_direct_usage.cpp.o -MF examples/CMakeFiles/beman.exemplar.examples.identity_direct_usage.dir/identity_direct_usage.cpp.o.d -o examples/CMakeFiles/beman.exemplar.examples.identity_direct_usage.dir/identity_direct_usage.cpp.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/examples/identity_direct_usage.cpp
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
[7/13] Building CXX object _deps/googletest-build/googletest/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o
FAILED: [code=1] _deps/googletest-build/googletest/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o 
ccache /usr/bin/g++  -isystem /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest/include -isystem /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest -fsanitize=address -fsanitize=leak -fsanitize=pointer-compare -fsanitize=pointer-subtract -fsanitize=undefined -fsanitize-undefined-trap-on-error -g -std=c++20  -DGTEST_HAS_PTHREAD=1 -MD -MT _deps/googletest-build/googletest/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o -MF _deps/googletest-build/googletest/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o.d -o _deps/googletest-build/googletest/CMakeFiles/gtest_main.dir/src/gtest_main.cc.o -c /Users/clausklein/Workspace/cpp/beman-project/exemplar/build/gcc-debug/_deps/googletest-src/googletest/src/gtest_main.cc
clang++: error: unsupported option '-fsanitize=leak' for target 'x86_64-apple-darwin23.6.0'
ninja: build stopped: subcommand failed.
bash-5.2$ 

[camio]

If you want to build with gcc on MacOS, run cmake directly without "--workflow" using CMake's documented way to specify the compiler and flags of your choice.

The gcc-* and llvm-* workflows are not supported on MacOS.

The reason you're seeing this error is because MacOS unfortunately creates a symlink that makes AppleClang pretend that it is gcc.

[ClausKlein]

But why not prevent this by using a condition i.e. a Linux CMake preset:

{
  "version": 6,
  "include": [
    "CMakeGenericPresets.json"
  ],
  "configurePresets": [
    {
      "name": "debug-base-Linux",
      "hidden": true,
      "cacheVariables": {
        "CMAKE_BUILD_TYPE": "Debug"
      },
      "condition": {
        "type": "equals",
        "lhs": "${hostSystemName}",
        "rhs": "Linux"
      }
    },
    {
      "name": "release-base-Linux",
      "hidden": true,
      "cacheVariables": {
        "CMAKE_BUILD_TYPE": "RelWithDebInfo"
      },
      "condition": {
        "type": "equals",
        "lhs": "${hostSystemName}",
        "rhs": "Linux"
      }
    },
    {
      "name": "debug",
      "displayName": "Debug Build",
      "inherits": [
        "root-config",
        "debug-base-Linux"
      ]
    },
    {
      "name": "release",
      "displayName": "Release Build",
      "inherits": [
        "root-config",
        "release-base-Linux"
      ]
    }
  ]
}

[camio]

But why not prevent this by using a condition i.e. a Linux CMake preset

This sounds like a good idea to me. I think we should only include presets that stand a chance of working on each platform.

@nickelpro, what do you think?

[nickelpro]

This kind of stuff is outside the intended design space for presets so there's no general purpose recommendation.

Speaking personally, the name is GCC, it invokes standard name of the GCC C++ compiler. If on a given machine that's symlinked to something other than GCC that's the individual developer's business.

There's no reason these presets can't work on MacOS if the developer has correctly configured their PATH such that the workflow g++ actually points at a GCC frontend, so I don't see why we would limit them only to Linux.