mirror of
https://github.com/ziglang/zig.git
synced 2026-02-13 21:08:36 +00:00
9ec9c0f5e5
`is_pub` added to `Fn` would cost us an additional 8 bytes of memory per function, which is a real bummer since it's only 1 bit of information. If we wanted to really remove this, I suspect we could make this a function isPub() which looks at the AST of the corresponding Decl and finds if the FnProto AST node has the pub token. However I saw an easier approach - The data of whether something is pub or not is actually a property of a Decl anyway, not a function, so we can look at moving the field into Decl. Indeed, doing this, we see that Decl already has deletion_flag: bool which is hiding in the padding bytes between the enum (1 byte) and the following u32 field (generation). So if we put the is_pub bool there, it actually will take up no additional space, with 1 byte of padding remaining. This was an easy reworking of the code since any func.is_pub could be changed simply to func.owner_decl.is_pub. I also modified `Var` to make the init value non-optional and moved the optional bit to a has_init: bool field. This is worse from the perspective of control flow and safety, however it makes `@sizeOf(Var)` go from 32 bytes to 24 bytes. The more code we can fit into memory at once, the more justified we are in using the compiler as a long-running process that does incremental updates.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
Resources
- Introduction
- Download & Documentation
- Community
- Contributing
- Frequently Asked Questions
- Community Projects
Building from Source
Note that you can download a binary of master branch.
Stage 1: Build Zig from C++ Source Code
Dependencies
POSIX
- cmake >= 2.8.5
- gcc >= 5.0.0 or clang >= 3.6.0
- LLVM, Clang, LLD development libraries == 10.x, compiled with the same gcc or clang version above
- Use the system package manager, or build from source.
Windows
- cmake >= 3.15.3
- Microsoft Visual Studio. Supported versions:
- 2015 (version 14)
- 2017 (version 15.8)
- 2019 (version 16)
- LLVM, Clang, LLD development libraries == 10.x
- Use the pre-built binaries or build from source.
Instructions
POSIX
mkdir build
cd build
cmake ..
make install
Need help? Troubleshooting Build Issues
MacOS
brew install cmake llvm
brew outdated llvm || brew upgrade llvm
mkdir build
cd build
cmake .. -DCMAKE_PREFIX_PATH=$(brew --prefix llvm)
make install
You will now run into this issue:
homebrew and llvm 10 packages in apt.llvm.org are broken with undefined reference to getPollyPluginInfo
or
error: unable to create target: 'Unable to find target for this triple (no targets are registered)',
in which case try -DZIG_WORKAROUND_4799=ON
Hopefully this will be fixed upstream with LLVM 10.0.1.
Windows
See https://github.com/ziglang/zig/wiki/Building-Zig-on-Windows