Build failure

[mjgarton]

I tried to follow the instructions in the readme, but got this:

$ cmake --build build/DebugNoModules
[21/164] Building CXX object z80/v3/CMakeFiles/z80_v3_make.dir/MakeZ80.cpp.o
FAILED: [code=1] z80/v3/CMakeFiles/z80_v3_make.dir/MakeZ80.cpp.o 
/usr/bin/ccache /usr/lib64/ccache/c++ -DSPECBOLT_EXPORT="" -I/tmp/specbolt -g -std=gnu++26 -fdiagnostics-color=always -Wall -Wextra -pedantic -Wshadow -Wconversion -Werror -MD -MT z80/v3/CMakeFiles/z80_v3_make.dir/MakeZ80.cpp.o -MF z80/v3/CMakeFiles/z80_v3_make.dir/MakeZ80.cpp.o.d -o z80/v3/CMakeFiles/z80_v3_make.dir/MakeZ80.cpp.o -c /tmp/specbolt/z80/v3/MakeZ80.cpp
/tmp/specbolt/z80/v3/MakeZ80.cpp: In constructor ‘constexpr {anonymous}::Opcode::Opcode(std::size_t, const {anonymous}::RegisterSet&)’:
/tmp/specbolt/z80/v3/MakeZ80.cpp:75:74: error: declaration of ‘reg_set’ shadows a member of ‘{anonymous}::Opcode’ [-Werror=shadow]
   75 |   explicit constexpr Opcode(const std::size_t opcode, const RegisterSet &reg_set) :
      |                                                       ~~~~~~~~~~~~~~~~~~~^~~~~~~
/tmp/specbolt/z80/v3/MakeZ80.cpp:73:22: note: shadowed declaration is here
   73 |   const RegisterSet &reg_set;
      |                      ^~~~~~~

It's entirely possibly I am doing something very wrong. I have little c++ experience, and even less cmake.

[mjgarton]

In case it's useful:

$ /usr/bin/ccache /usr/lib64/ccache/c++ --version
c++ (GCC) 15.2.1 20251022 (Red Hat 15.2.1-3)
Copyright (C) 2025 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[mattgodbolt]

Thanks: you have a newer GCC than I had when I built this! I"ll quickly fix...

[mattgodbolt]

if you git pull you should be able to run that cmake --build build/DebugNoModules again and it'll work now!

If you're just looking to play around with specbolt, a web build of it is at https://spectrum.xania.org/

[mjgarton]

Thanks for the quick response and fix @mattgodbolt . This works fine for me now. I already noticed the web build, but my goal is to play around with the code and hopefully learn something from it, so having a working build was a starting point for that.

(I mean here learning more about some of the techniques you used, rather than learning c++ properly. I'm interested to see how some of the approaches from your fantastic talk may or may not translate to Rust, which I am much more familiar with, and which I've used for my own spectrum emulator so far)