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d3ebd42865
This commit makes it possible to obtain pointers to `extern` variables at comptime. - `ir_get_var_ptr` employs several checks to determine if the given variable is eligible for obtaining its pointer at comptime. This commit alters these checks to consider `extern` variables, which have runtime values, as eligible. - After this change, it's now possible for `render_const_val` to be called for `extern` variables. This commit modifies `render_const_val` to suppress the value generation for `extern` variables. - `do_code_gen` now creates `ZigValue::llvm_global` of `extern` variables before iterating through module-level variables so that other module-level variables can refer to them. This solution is incomplete since there are several cases still failing: - `global_var.array[n..m]` - `&global_var.array[i]` - `&global_var.inner_struct.value` - `&global_array[i]` Closes #5349
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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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brew outdated llvm || brew upgrade llvm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