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12de7e3472
Much of the logic from Compilation.create() is extracted into Compilation.Config.resolve() which accepts many optional settings and produces concrete settings. This separate step is needed by API users of Compilation so that they can pass the resolved global settings to the Module creation function, which itself needs to resolve per-Module settings. Since the target and other things are no longer global settings, I did not want them stored in link.File (in the `options` field). That options field was already a kludge; those options should be resolved into concrete settings. This commit also starts to work on that, deleting link.Options, moving the fields into Compilation and ObjectFormat-specific structs instead. Some fields were ephemeral and should not have been stored at all, such as symbol_size_hint. The link.File object of Compilation is now a `?*link.File` and `null` when -fno-emit-bin is passed. It is now arena-allocated along with Compilation itself, avoiding some messy cleanup code that was there before. On the command line, it is now possible to configure the standard library itself by using `--mod std` just like any other module. This meant that the CLI needed to create the standard library module rather than having Compilation create it. There are a lot of changes in this commit and it's still not done. I didn't realize how quickly this changeset was going to balloon out of control, and there are still many lines that need to be changed before it even compiles successfully. * introduce std.Build.Cache.HashHelper.oneShot * add error_tracing to std.Build.Module * extract build.zig file generation into src/Builtin.zig * each CSourceFile and RcSourceFile now has a Module owner, which determines some of the C compiler flags.