`#+vet` tags nullify command line build `-vet` parameters

[BigBoyBarney]

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

Odin: dev-2025-12
OS: Debian GNU/Linux forky/sid, Linux 6.17.8-300.fc43.x86_64
CPU: AMD Ryzen 7 5800X3D 8-Core Processor
RAM: 32004 MiB
Backend: LLVM 19.1.7

The following code snippet illustrates the issue:

package main

main :: proc() {
	x: int
}

• If we run odin check . on this, or odin build, this builds just fine.
• If we run odin check . -vet, it errors, with 'x' declared but not used as expected.
• If we add any #+vet to the top of the file, the error is ignored:

#+vet cast
package main

main :: proc() {
	x: int
}

odin check . -vet and odin build -vet show no error and build just fine, even though it should error.

The main case where this is an issue is #+vet explicit-allocators, which must be a file flag. So it effectively means that #+vet explicit-allocators disables every other form of vetting.