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In order to make the packages in this repo "reinstallable", we need to
associate source code with a specific packages. Having a top level
`/includes` dir that mixes concerns (which packages' includes?) gets in
the way of this.
To start, I have moved everything to `rts/`, which is mostly correct.
There are a few things however that really don't belong in the rts (like
the generated constants haskell type, `CodeGen.Platform.h`). Those
needed to be manually adjusted.
Things of note:
- No symlinking for sake of windows, so we hard-link at configure time.
- `CodeGen.Platform.h` no longer as `.hs` extension (in addition to
being moved to `compiler/`) so as not to confuse anyone, since it is
next to Haskell files.
- Blanket `-Iincludes` is gone in both build systems, include paths now
more strictly respect per-package dependencies.
- `deriveConstants` has been taught to not require a `--target-os` flag
when generating the platform-agnostic Haskell type. Make takes
advantage of this, but Hadrian has yet to.
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This both says what we mean and silences a bunch of spurious CPP linting
warnings. This pragma is supported by all CPP implementations which we
support.
Reviewers: austin, erikd, simonmar, hvr
Reviewed By: simonmar
Subscribers: rwbarton, thomie
Differential Revision: https://phabricator.haskell.org/D3482
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Rather than have main() be statically compiled as part of the RTS, we
now generate it into the tiny C file that we compile when linking a
binary.
The main motivation is that we want to pass the settings for the
-rtsotps and -with-rtsopts flags into the RTS, rather than relying on
fragile linking semantics to override the defaults, which don't work
with DLLs on Windows (#5373). In order to do this, we need to extend
the API for initialising the RTS, so now we have:
void hs_init_ghc (int *argc, char **argv[], // program arguments
RtsConfig rts_config); // RTS configuration
hs_init_ghc() can optionally be used instead of hs_init(), and allows
passing in configuration options for the RTS. RtsConfig is a struct,
which currently has two fields:
typedef struct {
RtsOptsEnabledEnum rts_opts_enabled;
const char *rts_opts;
} RtsConfig;
but might have more in the future. There is a default value for the
struct, defaultRtsConfig, the idea being that you start with this and
override individual fields as necessary.
In fact, main() was in a separate static library, libHSrtsmain.a.
That's now gone.
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