AaronBallman wrote:

> @AaronBallman Can you describe your current plan how driver options are going 
> to behave in the light of `#embed`?

I'm flexible with how we proceed, so if others have different ideas, feel free 
to suggest them! But my initial inclination is:

* `--embed-dir=<dir>` as a way to specify a search path for `<>` and `""` 
embedded resources; the quoted form will search the current directory similar 
to how it behaves for `#include`. I do not envision needing a "system" embedded 
resources directory, but should such a need arise, we can consider something 
like `--embed-system=<dir>` to support it.
* `-E -dE` as a way to preprocess to a file without exploding the contents of 
the embedded resource into the preprocessed output (that output could become 
very large). Then the options for determining makefile dependencies can be 
updated to consider embedded resources are a dependency and tools like distcc 
can hopefully cope from there.
* As a follow-up, I might consider adding a directive `#embed_base64` that 
holds base64 encoded file contents of the resource to be embedded. Then we can 
add `-E -dE64` (or some other option name) to preprocess from `#embed <file>` 
to `#embed_base64 <encoded contents>` for times when it's not plausible to keep 
the source and the resource separately. I don't envision that being a directive 
users would use directly, but instead only for rewriting purposes.

Ideally, GCC and Clang can agree on what and how we surface the command line 
features.

https://github.com/llvm/llvm-project/pull/68620
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