Question: which gcc/g++ version does it support?

[krshrimali]

Hi @foonathan ! Thank you for your streams, and work here.

I was trying to follow along with your stream, trying to write it myself, and couldn't compile. I cross-checked by directly cloning this repo, and trying to build it, and I get this error:

[ 17%] Building CXX object _deps/lauf-build/src/CMakeFiles/lauf_core.dir/lauf/vm.cpp.o
In file included from /tmp/clauf/_deps/lauf-src/src/../include/lauf/vm.h:7,
                 from /tmp/clauf/_deps/lauf-src/src/./lauf/vm.hpp:7,
                 from /tmp/clauf/_deps/lauf-src/src/lauf/vm.cpp:4:
/tmp/clauf/_deps/lauf-src/src/./lauf/vm_execute.hpp: In function ‘bool lauf::execute(const lauf_asm_inst*, lauf_runtime_value*, lauf_runtime_stack_frame*, lauf_runtime_process*)’:
/tmp/clauf/_deps/lauf-src/src/../include/lauf/config.h:42:24: error: attributes at the beginning of statement are ignored [-Werror=attributes]
   42 | #define LAUF_TAIL_CALL [[clang::musttail]]
      |                        ^~~~~~~~~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/./lauf/vm_execute.hpp:16:5: note: in expansion of macro ‘LAUF_TAIL_CALL’
   16 |     LAUF_TAIL_CALL return lauf::dispatch[std::size_t(ip->op())](ip, vstack_ptr, frame_ptr, process)
      |     ^~~~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/./lauf/vm_execute.hpp:21:5: note: in expansion of macro ‘LAUF_VM_DISPATCH’
   21 |     LAUF_VM_DISPATCH;
      |     ^~~~~~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/./lauf/vm_execute.hpp: In function ‘bool lauf_runtime_builtin_dispatch(const lauf_asm_inst*, lauf_runtime_value*, lauf_runtime_stack_frame*, lauf_runtime_process*)’:
/tmp/clauf/_deps/lauf-src/src/../include/lauf/config.h:42:24: error: attributes at the beginning of statement are ignored [-Werror=attributes]
   42 | #define LAUF_TAIL_CALL [[clang::musttail]]
      |                        ^~~~~~~~~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/./lauf/vm_execute.hpp:16:5: note: in expansion of macro ‘LAUF_TAIL_CALL’
   16 |     LAUF_TAIL_CALL return lauf::dispatch[std::size_t(ip->op())](ip, vstack_ptr, frame_ptr, process)
      |     ^~~~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/./lauf/vm_execute.hpp:30:5: note: in expansion of macro ‘LAUF_VM_DISPATCH’
   30 |     LAUF_VM_DISPATCH;
      |     ^~~~~~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/lauf/vm.cpp: In function ‘bool lauf_vm_execute(lauf_vm*, lauf_asm_program*, const lauf_runtime_value*, lauf_runtime_value*)’:
/tmp/clauf/_deps/lauf-src/src/lauf/vm.cpp:185:17: error: suggest braces around empty body in an ‘else’ statement [-Werror=empty-body]
  185 |                 ; // We don't know the starting address of the allocation.
      |                 ^
In file included from /tmp/clauf/_deps/lauf-src/src/./lauf/runtime/process.hpp:12,
                 from /tmp/clauf/_deps/lauf-src/src/./lauf/vm.hpp:10:
/tmp/clauf/_deps/lauf-src/src/./lauf/support/array.hpp: In instantiation of ‘void lauf::array<T>::reserve(lauf::arena_base&, std::size_t) [with T = lauf::allocation; std::size_t = long unsigned int]’:
/tmp/clauf/_deps/lauf-src/src/./lauf/support/array.hpp:179:13:   required from ‘void lauf::array<T>::resize_uninitialized(lauf::arena_base&, std::size_t) [with T = lauf::allocation; std::size_t = long unsigned int]’
/tmp/clauf/_deps/lauf-src/src/lauf/vm.cpp:102:46:   required from here
/tmp/clauf/_deps/lauf-src/src/./lauf/support/array.hpp:126:25: error: conversion from ‘long unsigned int’ to ‘long unsigned int:63’ may change value [-Werror=conversion]
  126 |             _capacity = new_capacity;
      |                         ^~~~~~~~~~~~
/tmp/clauf/_deps/lauf-src/src/./lauf/support/array.hpp:136:25: error: conversion from ‘long unsigned int’ to ‘long unsigned int:63’ may change value [-Werror=conversion]
  136 |             _capacity = new_capacity;
      |                         ^~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[2]: *** [_deps/lauf-build/src/CMakeFiles/lauf_core.dir/build.make:104: _deps/lauf-build/src/CMakeFiles/lauf_core.dir/lauf/vm.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:299: _deps/lauf-build/src/CMakeFiles/lauf_core.dir/all] Error 2
make: *** [Makefile:101: all] Error 

I understand the project is in very initial stages, but I just wanted to understand if I'm using any wrong version of compiler since you mentioned C++ 23 in your README.

I'm using: g++ (GCC) 12.2.0.

[foonathan]

Compiler support is currently limited by lauf, which requires clang 13 or newer. GCC is missing the musttail attribute, so isn't supported until I implement a different dispatching technique.

[krshrimali]

Compiler support is currently limited by lauf, which requires clang 13 or newer. GCC is missing the musttail attribute, so isn't supported until I implement a different dispatching technique.

Thanks! I tried using clang (14.0.6 version), but still the same error.

[foonathan]

Are you sure you've set up CMake properly? I'm using clang 14.0.6 as well...

[krshrimali]

Are you sure you've set up CMake properly? I'm using clang 14.0.6 as well...

I just checked the GitHub CI https://github.com/foonathan/clauf/blob/main/.github/workflows/ci.yml and the commands, work once I do: export CC=/usr/bin/clang and export CXX=/usr/bin/clang++. Sorry for the noise!

[foonathan]

No problem.