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e2c741f1e7
I have observed on Linux writing and reading the same file many times without the mtime changing, despite the file system having nanosecond granularity (and about 1 millisecond worth of nanoseconds passing between modifications). I am calling this a Linux Kernel Bug and adding file size to the cache hash manifest as a mitigation. As evidence, macOS does not exhibit this behavior. This means it is possible, on Linux, for a file to be added to the cache hash, and, if it is updated with the same file size, same inode, within about 1 millisecond, the cache system will give us a false positive, saying it is unmodified. I don't see any way to improve this situation without fixing the bug in the Linux kernel. closes #6082
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brew outdated llvm || brew upgrade llvm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