problem description of zig libstd for testing printed paths

[matu3ba]

build.zig: StdIoAction limits make, which executes *RunStep
requires comptime-selection of string compare function, which is currently not possible in libstd.

child_process.zig ExecResult we can not reuse dependency resolving
src/test.zig is not usable and neither has custom string matching

possible solutions:

1. comptime-selection of user-provided function in build.zig for the stuff in make() of RunStep.zig
2. work around with 1 level of indirection and more code
3. own build runner
4. own test runner (lib)

Long-term goal is to have parallelization and user-configuration of zig test_runner, which does step 2.
However, writing the test cases into test-blocks feels like an aweful hack and having an idea how to make it in build.zig is needed eventually anyway.

[matu3ba]

xq on discord:

expand build.zig

[matu3ba]

Without ziglang/zig#11214 its more annoying to call zig build.

The other open question is, if Zig should have stuff for testing build.zig inside build.zig (temporary files/persistent files) and/or how to combine the autodoc system with that.

[matu3ba]

pending ziglang/zig#11472