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Matthew Lugg 291addadf8 tests: move incremental target matrix out of manifests
Having the matrix of test targets for incremental compilation in the
individual test manifests has turned out to be inconvenient for a few
reasons: the tests are almost certain to accidentally get out of sync,
disabling targets entirely is annoying to do, and incr-check needs to
take care to print the target in all error messages (which currently
does not always happen).

If I recall correctly, I originally designed it this way because it
allows targets to be disabled at the granularity of individual tests,
but there's an easier approach to that: just let a test manifest that it
should be *skipped* on a certain target! As skipping is the rare case,
and also the case you want readers to notice, it makes sense for *it* to
be explicitly specified, like how unit tests use `error.SkipZigTest`.

So, `incr-check` no longer runs through a list of targets specified in
the manifest. Instead, it accepts (and, in fact, requires) a single
target on the command line, and runs the test for that specific target.
If the file contains a `#skip_target` directive for that target, then
`incr-check` exits immediately, so we can still disable targets at
individual test granularity, but you can also disable a target for all
tests by just commenting it out of the matrix in `test/tests.zig`.

As a nice bonus, this also allows the build system to run different
incremental test targets in parallel, because the targets are now
different steps.

This definitely seems like a better way to split the work between the
build system and incr-check---sorry for getting this wrong initially!
2026-04-15 00:06:18 +02:00

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#update=initial version with no compile log
#file=main.zig
const std = @import("std");
pub fn main() !void {
try std.Io.File.stdout().writeStreamingAll(io, "Hello, World!\n");
}
const io = std.Io.Threaded.global_single_threaded.io();
#expect_stdout="Hello, World!\n"
#update=add compile log
#file=main.zig
const std = @import("std");
pub fn main() !void {
try std.Io.File.stdout().writeStreamingAll(io, "Hello, World!\n");
@compileLog("this is a log");
}
const io = std.Io.Threaded.global_single_threaded.io();
#expect_error=main.zig:4:5: error: found compile log statement
#expect_compile_log=@as(*const [13:0]u8, "this is a log")
#update=remove compile log
#file=main.zig
const std = @import("std");
pub fn main() !void {
try std.Io.File.stdout().writeStreamingAll(io, "Hello, World!\n");
}
const io = std.Io.Threaded.global_single_threaded.io();
#expect_stdout="Hello, World!\n"