std.Build: Allow ConfigHeader values to be added outside of comptime #22795
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cbilz
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Feb 9, 2025
There were a few configuration value conflicts between `config.h` and the Gnulib headers, so it made sense to draw their values from different pools. The Gnulib headers use `@FOO@`-style substitution hooks. So far, we used `ConfigHeader.Style.cmake` to configure these, but this fails for `unistd.h`, see ziglang/zig#22794. Further, we add a function that allows build-time configuration of `ConfigHeader` values, see ziglang/zig#22795. This is more convenient and should improve overall build times as comptime is still relatively slow. We use a modified version of `ConfigHeader` until these pull requests are merged.
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The current public interface of
std.Build.Step.ConfigHeaderonly allows configuration values to be added at comptime usingaddValues(). This pull request adds a new public functonaddValuethat enables configuration values to be added during build graph construction, i.e. while thebuild()function runs.This change allows values to be determined by checks that cannot be performed at comptime, such as inspection of system features or build dependencies.