Hi Jonas,
I've had a quick look at emcc now. I don't feel comfortable adding a ccache
symlink for it without some kind of evaluation of how emcc's options interact
when using the "-c" mode -- a symlink in /usr/lib/ccache would signal that
ccache officially supports emcc, which it doesn't (yet).
>From "emcc --help" I see that the following options take an argument, which is
something that ccache would need to be taught about to work properly:
--closure
--js-transform
--llvm-opts
--memory-init-file
--minify
--output_eol
--source-map-base
--valid-abspath
-s
On the other hand, perhaps none of these are applicable (or used in practice)
when using "-c", but that's not something I can rule out.
This option definitely isn't compatible with ccache since it changes the output
filename:
--default-obj-ext
These options take an argument that refers to an input file which ccache should
read and hash separately as part of the input:
--embed-file
--exclude-file
--extern-post-js
--extern-pre-js
--js-library
--post-js
--pre-js
--preload-file
--shell-file
Again, maybe none of those are applicable when using "-c" but I can't really
tell.
These produce another output file which would need to be cached by ccache:
-gseparate-dwarf
--emit-symbol-map
They don't seem to have any effect when using "-c", though?
Some environment variables (EMMAKEN_CFLAGS, EMCC_CLOSURE_ARGS) maybe also need
special treatment?
Regards,
Joel
On Thu, 15 Oct 2020 at 12:39, Jonas Smedegaard wrote:
>
> Package: ccache
> Version: 3.7.12-1
> Severity: normal
>
> -BEGIN PGP SIGNED MESSAGE-
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> The emcc command part of emscripten supports ccache:
> https://github.com/emscripten-core/emscripten/issues/11974
>
> Please ship the Debian ccache package with symlink for emcc.
>
> - Jonas
>
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