| Commit message (Collapse) | Author | Age | Files | Lines |
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This flag is not applicable when Clang is used.
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Drop hack for #1828, among others as they appear to be unnecessary when
using `llvm-windres`.
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On Windows we don't have a linker which supports object joining (i.e.
the `-r` flag). Consequently, `-pgmlm` is now a `Maybe`.
See #21068.
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These flags were added to help with the high linking cost of the old
split-objs mode. Now we are using split-sections these flags appear to
make no difference to memory usage or time taken to link.
I tested various configurations linking together the ghc library with
-split-sections enabled.
| linker | time (s) |
| ------ | ------ |
| gold | 0.95 |
| ld | 1.6 |
| ld (hash-size = 31, reduce-memory-overheads) | 1.6 |
| ldd | 0.47 |
Fixes #20967
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This was achieved with
git ls-tree --name-only HEAD -r | xargs sed -i -e 's/note \[/Note \[/g'
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Newer lld versions may include vendor info in --version output and
thus the version string may not start with ‘LLD’.
Fixes #20907
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Multiple home units allows you to load different packages which may depend on
each other into one GHC session. This will allow both GHCi and HLS to support
multi component projects more naturally.
Public Interface
~~~~~~~~~~~~~~~~
In order to specify multiple units, the -unit @⟨filename⟩ flag
is given multiple times with a response file containing the arguments for each unit.
The response file contains a newline separated list of arguments.
```
ghc -unit @unitLibCore -unit @unitLib
```
where the `unitLibCore` response file contains the normal arguments that cabal would pass to `--make` mode.
```
-this-unit-id lib-core-0.1.0.0
-i
-isrc
LibCore.Utils
LibCore.Types
```
The response file for lib, can specify a dependency on lib-core, so then modules in lib can use modules from lib-core.
```
-this-unit-id lib-0.1.0.0
-package-id lib-core-0.1.0.0
-i
-isrc
Lib.Parse
Lib.Render
```
Then when the compiler starts in --make mode it will compile both units lib and lib-core.
There is also very basic support for multiple home units in GHCi, at the
moment you can start a GHCi session with multiple units but only the
:reload is supported. Most commands in GHCi assume a single home unit,
and so it is additional work to work out how to modify the interface to
support multiple loaded home units.
Options used when working with Multiple Home Units
There are a few extra flags which have been introduced specifically for
working with multiple home units. The flags allow a home unit to pretend
it’s more like an installed package, for example, specifying the package
name, module visibility and reexported modules.
-working-dir ⟨dir⟩
It is common to assume that a package is compiled in the directory
where its cabal file resides. Thus, all paths used in the compiler
are assumed to be relative to this directory. When there are
multiple home units the compiler is often not operating in the
standard directory and instead where the cabal.project file is
located. In this case the -working-dir option can be passed which
specifies the path from the current directory to the directory the
unit assumes to be it’s root, normally the directory which contains
the cabal file.
When the flag is passed, any relative paths used by the compiler are
offset by the working directory. Notably this includes -i and
-I⟨dir⟩ flags.
-this-package-name ⟨name⟩
This flag papers over the awkward interaction of the PackageImports
and multiple home units. When using PackageImports you can specify
the name of the package in an import to disambiguate between modules
which appear in multiple packages with the same name.
This flag allows a home unit to be given a package name so that you
can also disambiguate between multiple home units which provide
modules with the same name.
-hidden-module ⟨module name⟩
This flag can be supplied multiple times in order to specify which
modules in a home unit should not be visible outside of the unit it
belongs to.
The main use of this flag is to be able to recreate the difference
between an exposed and hidden module for installed packages.
-reexported-module ⟨module name⟩
This flag can be supplied multiple times in order to specify which
modules are not defined in a unit but should be reexported. The
effect is that other units will see this module as if it was defined
in this unit.
The use of this flag is to be able to replicate the reexported
modules feature of packages with multiple home units.
Offsetting Paths in Template Haskell splices
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When using Template Haskell to embed files into your program,
traditionally the paths have been interpreted relative to the directory
where the .cabal file resides. This causes problems for multiple home
units as we are compiling many different libraries at once which have
.cabal files in different directories.
For this purpose we have introduced a way to query the value of the
-working-dir flag to the Template Haskell API. By using this function we
can implement a makeRelativeToProject function which offsets a path
which is relative to the original project root by the value of
-working-dir.
```
import Language.Haskell.TH.Syntax ( makeRelativeToProject )
foo = $(makeRelativeToProject "./relative/path" >>= embedFile)
```
> If you write a relative path in a Template Haskell splice you should use the makeRelativeToProject function so that your library works correctly with multiple home units.
A similar function already exists in the file-embed library. The
function in template-haskell implements this function in a more robust
manner by honouring the -working-dir flag rather than searching the file
system.
Closure Property for Home Units
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For tools or libraries using the API there is one very important closure
property which must be adhered to:
> Any dependency which is not a home unit must not (transitively) depend
on a home unit.
For example, if you have three packages p, q and r, then if p depends on
q which depends on r then it is illegal to load both p and r as home
units but not q, because q is a dependency of the home unit p which
depends on another home unit r.
If you are using GHC by the command line then this property is checked,
but if you are using the API then you need to check this property
yourself. If you get it wrong you will probably get some very confusing
errors about overlapping instances.
Limitations of Multiple Home Units
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
There are a few limitations of the initial implementation which will be smoothed out on user demand.
* Package thinning/renaming syntax is not supported
* More complicated reexports/renaming are not yet supported.
* It’s more common to run into existing linker bugs when loading a
large number of packages in a session (for example #20674, #20689)
* Backpack is not yet supported when using multiple home units.
* Dependency chasing can be quite slow with a large number of
modules and packages.
* Loading wired-in packages as home units is currently not supported
(this only really affects GHC developers attempting to load
template-haskell).
* Barely any normal GHCi features are supported, it would be good to
support enough for ghcid to work correctly.
Despite these limitations, the implementation works already for nearly
all packages. It has been testing on large dependency closures,
including the whole of head.hackage which is a total of 4784 modules
from 452 packages.
Internal Changes
~~~~~~~~~~~~~~~~
* The biggest change is that the HomePackageTable is replaced with the
HomeUnitGraph. The HomeUnitGraph is a map from UnitId to HomeUnitEnv,
which contains information specific to each home unit.
* The HomeUnitEnv contains:
- A unit state, each home unit can have different package db flags
- A set of dynflags, each home unit can have different flags
- A HomePackageTable
* LinkNode: A new node type is added to the ModuleGraph, this is used to
place the linking step into the build plan so linking can proceed in
parralel with other packages being built.
* New invariant: Dependencies of a ModuleGraphNode can be completely
determined by looking at the value of the node. In order to achieve
this, downsweep now performs a more complete job of downsweeping and
then the dependenices are recorded forever in the node rather than
being computed again from the ModSummary.
* Some transitive module calculations are rewritten to use the
ModuleGraph which is more efficient.
* There is always an active home unit, which simplifies modifying a lot
of the existing API code which is unit agnostic (for example, in the
driver).
The road may be bumpy for a little while after this change but the
basics are well-tested.
One small metric increase, which we accept and also submodule update to
haddock which removes ExtendedModSummary.
Closes #10827
-------------------------
Metric Increase:
MultiLayerModules
-------------------------
Co-authored-by: Fendor <power.walross@gmail.com>
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Llvm.Types: remove redundant import
SysTools.Tasks: remove redundant import
- namely CmmToLlvm.Base
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CodeOutput: LCGConfig, add handshake initLCGConfig
Add two modules:
GHC.CmmToLlvm.Config -- to hold the Llvm code gen config
GHC.Driver.Config.CmmToLlvm -- for initialization, other utils
CmmToLlvm: remove HasDynFlags, add LlvmConfig
CmmToLlvm: add lcgContext to LCGConfig
CmmToLlvm.Base: DynFlags --> LCGConfig
Llvm: absorb LlvmOpts into LCGConfig
CmmToLlvm.Ppr: swap DynFlags --> LCGConfig
CmmToLlvm.CodeGen: swap DynFlags --> LCGConfig
CmmToLlvm.CodeGen: swap DynFlags --> LCGConfig
CmmToLlvm.Data: swap LlvmOpts --> LCGConfig
CmmToLlvm: swap DynFlags --> LCGConfig
CmmToLlvm: move LlvmVersion to CmmToLlvm.Config
Additionally:
- refactor Config and initConfig to hold LlvmVersion
- push IO needed to get LlvmVersion to boundary between Cmm and LLvm
code generation
- remove redundant imports, this is much cleaner!
CmmToLlvm.Config: store platformMisc_llvmTarget
instead of all of platformMisc
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As noted in #20757, `GHC.SysTools.BaseDir.findToolDir` previously
contained an loop, which would be triggered in the case that the search
failed.
Closes #20757.
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Get rid of `USE_INPLACE_MINGW_TOOLCHAIN` and use a settings file entry
instead.
The CPP setting was originally introduced in f065b6b012.
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I've already fixed this 7 months ago in the comments of #16780 but it
never got merged. Now we need this for #20657 too.
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We needed to wait for the process to exit in the clean-up script as
otherwise the `llc` process will not be killed until compilation
finishes. This leads to running out of process spaces on some OSs.
Thanks to Edsko de Vries for suggesting this fix.
Fixes #20305
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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 is small step towards #19877. We want to make the Loader/Linker
interface more abstract to be easily reused (i.e. don't pass it
DynFlags) but the system linker uses TmpFs which required a DynFlags
value to get its temp directory. We explicitly pass the temp directory
now. Similarly TmpFs was consulting the DynFlags to decide whether to
clean or: this is now done by the caller in the driver code.
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bound.
We use a non-inclusive upper bound so that setting the upper bound to 13 for
example means that all 12.x versions are accepted.
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Introduce LogFlags as a independent subset of DynFlags used for logging.
As a consequence in many places we don't have to pass both Logger and
DynFlags anymore.
The main reason for this refactoring is that I want to refactor the
systools interfaces: for now many systools functions use DynFlags both
to use the Logger and to fetch their parameters (e.g. ldInputs for the
linker). I'm interested in refactoring the way they fetch their
parameters (i.e. use dedicated XxxOpts data types instead of DynFlags)
for #19877. But if I did this refactoring before refactoring the Logger,
we would have duplicate parameters (e.g. ldInputs from DynFlags and
linkerInputs from LinkerOpts). Hence this patch first.
Some flags don't really belong to LogFlags because they are subsystem
specific (e.g. most DumpFlags). For example -ddump-asm should better be
passed in NCGConfig somehow. This patch doesn't fix this tight coupling:
the dump flags are part of the UI but they are passed all the way down
for example to infer the file name for the dumps.
Because LogFlags are a subset of the DynFlags, we must update the former
when the latter changes (not so often). As a consequence we now use
accessors to read/write DynFlags in HscEnv instead of using `hsc_dflags`
directly.
In the process I've also made some subsystems less dependent on DynFlags:
- CmmToAsm: by passing some missing flags via NCGConfig (see new fields
in GHC.CmmToAsm.Config)
- Core.Opt.*:
- by passing -dinline-check value into UnfoldingOpts
- by fixing some Core passes interfaces (e.g. CallArity, FloatIn)
that took DynFlags argument for no good reason.
- as a side-effect GHC.Core.Opt.Pipeline.doCorePass is much less
convoluted.
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arguments (#19827)
Previously we assumed that the assembler was the same as the c compiler,
but we allow setting them to different programs with -pgmc and -pgma.
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Replace uses of WARN macro with calls to:
warnPprTrace :: Bool -> SDoc -> a -> a
Remove the now unused HsVersions.h
Bump haddock submodule
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fix #18000
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This allows us to use the unsafe shifts in non-debug builds for performance.
For older versions of base we instead export Data.Bits
See also #19618
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This commit further expand on the design for #18516 by getting rid of
the `defaultReasonSeverity` in favour of a function called
`diagReasonSeverity` which correctly takes the `DynFlags` as input. The
idea is to compute the `Severity` and the `DiagnosticReason` of each
message "at birth", without doing any later re-classifications, which
are potentially error prone, as the `DynFlags` might evolve during the
course of the program.
In preparation for a proper refactoring, now `pprWarning` from the
Parser.Ppr module has been renamed to `mkParserWarn`, which now takes a
`DynFlags` as input.
We also get rid of the reclassification we were performing inside `printOrThrowWarnings`.
Last but not least, this commit removes the need for reclassify inside GHC.Tc.Errors,
and also simplifies the implementation of `maybeReportError`.
Update Haddock submodule
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Other than that:
* Fix T16167,json,json2,T7478,T10637 tests to reflect the introduction of
the `MessageClass` type
* Remove `makeIntoWarning`
* Remove `warningsToMessages`
* Refactor GHC.Tc.Errors
1. Refactors GHC.Tc.Errors so that we use `DiagnosticReason` for "choices"
(defer types errors, holes, etc);
2. We get rid of `reportWarning` and `reportError` in favour of a general
`reportDiagnostic`.
* Introduce `DiagnosticReason`, `Severity` is an enum: This big commit makes
`Severity` a simple enumeration, and introduces the concept of `DiagnosticReason`,
which classifies the /reason/ why we are emitting a particular diagnostic.
It also adds a monomorphic `DiagnosticMessage` type which is used for
generic messages.
* The `Severity` is computed (for now) from the reason, statically.
Later improvement will add a `diagReasonSeverity` function to compute
the `Severity` taking `DynFlags` into account.
* Rename `logWarnings` into `logDiagnostics`
* Add note and expand description of the `mkHoleError` function
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Previously we would support only one LLVM major version. Here we
generalize this to accept a range, taking this range to be LLVM 10 to 11,
as 11 is necessary for Apple M1 support. We also accept 12, as that is
what apple ships with BigSur on the M1.
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Now that GHC 9.0.1 is released, it is time to drop support for bootstrapping
with GHC 8.8, as we only support building with the previous two major GHC
releases. As an added bonus, this allows us to remove several bits of CPP that
are either always true or no longer reachable.
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Before this patch, the only way to override GHC's default logging
behavior was to set `log_action`, `dump_action` and `trace_action`
fields in DynFlags. This patch introduces a new Logger abstraction and
stores it in HscEnv instead.
This is part of #17957 (avoid storing state in DynFlags). DynFlags are
duplicated and updated per-module (because of OPTIONS_GHC pragma), so
we shouldn't store global state in them.
This patch also fixes a race in parallel "--make" mode which updated
the `generatedDumps` IORef concurrently.
Bump haddock submodule
The increase in MultilayerModules is tracked in #19293.
Metric Increase:
MultiLayerModules
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This commit boldly removes the ErrDoc and the MsgDoc from the codebase.
The former was introduced with the only purpose of classifying errors
according to their importance, but a similar result can be obtained just
by having a simple [SDoc], and placing bullets after each of them.
On top of that I have taken the perhaps controversial decision to also
banish MsgDoc, as it was merely a type alias over an SDoc and as such it wasn't
offering any extra type safety. Granted, it was perhaps making type
signatures slightly more "focused", but at the expense of cognitive
burden: if it's really just an SDoc, let's call it with its proper name.
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Related to a future change in Data.List,
https://downloads.haskell.org/ghc/8.10.3/docs/html/users_guide/using-warnings.html?highlight=wcompat#ghc-flag--Wcompat-unqualified-imports
Companion pull&merge requests:
- https://github.com/judah/haskeline/pull/153
- https://github.com/haskell/containers/pull/762
- https://gitlab.haskell.org/ghc/packages/hpc/-/merge_requests/9
After these the actual change in Data.List should be easy to do.
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Move linker related code into GHC.Linker. Previously it was scattered
into GHC.Unit.State, GHC.Driver.Pipeline, GHC.Runtime.Linker, etc.
Add documentation in GHC.Linker
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I was working on making DynFlags stateless (#17957), especially by
storing loaded plugins into HscEnv instead of DynFlags. It turned out to
be complicated because HscEnv is in GHC.Driver.Types but LoadedPlugin
isn't: it is in GHC.Driver.Plugins which depends on GHC.Driver.Types. I
didn't feel like introducing yet another hs-boot file to break the loop.
Additionally I remember that while we introduced the module hierarchy
(#13009) we talked about splitting GHC.Driver.Types because it contained
various unrelated types and functions, but we never executed. I didn't
feel like making GHC.Driver.Types bigger with more unrelated Plugins
related types, so finally I bit the bullet and split GHC.Driver.Types.
As a consequence this patch moves a lot of things. I've tried to put
them into appropriate modules but nothing is set in stone.
Several other things moved to avoid loops.
* Removed Binary instances from GHC.Utils.Binary for random compiler
things
* Moved Typeable Binary instances into GHC.Utils.Binary.Typeable: they
import a lot of things that users of GHC.Utils.Binary don't want to
depend on.
* put everything related to Units/Modules under GHC.Unit:
GHC.Unit.Finder, GHC.Unit.Module.{ModGuts,ModIface,Deps,etc.}
* Created several modules under GHC.Types: GHC.Types.Fixity, SourceText,
etc.
* Split GHC.Utils.Error (into GHC.Types.Error)
* Finally removed GHC.Driver.Types
Note that this patch doesn't put loaded plugins into HscEnv. It's left
for another patch.
Bump haddock submodule
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Metric Decrease:
Naperian
T10421
T10421a
T10547
T12150
T12234
T12425
T13035
T18140
T18304
T5837
T6048
T13253-spj
T18282
T18223
T3064
T9961
Metric Increase
T13701
HFSKJH
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In b592bd98ff25730bbe3c13d6f62a427df8c78e28 we started using
-dead_strip_dylib on macOS when lining dynamic libraries and binaries.
The underlying reason being the Load Command Size Limit in macOS
Sierra (10.14) and later.
GHC will produce @rpath/libHS... dependency entries together with a
corresponding RPATH entry pointing to the location of the libHS...
library. Thus for every library we produce two Load Commands. One to
specify the dependent library, and one with the path where to find it.
This makes relocating libraries and binaries easier, as we just need to
update the RPATH entry with the install_name_tool. The dynamic linker
will then subsitute each @rpath with the RPATH entries it finds in the
libraries load commands or the environement, when looking up @rpath
relative libraries.
-dead_strip_dylibs intructs the linker to drop unused libraries. This in
turn help us reduce the number of referenced libraries, and subsequently
the size of the load commands. This however does not remove the RPATH
entries. Subsequently we can end up (in extreme cases) with only a
single @rpath/libHS... entry, but 100s or more RPATH entries in the Load
Commands.
This patch rectifies this (slighly unorthodox) by passing *no* -rpath
arguments to the linker at link time, but -headerpad 8000. The
headerpad argument is in hexadecimal and the maxium 32k of the load
command size. This tells the linker to pad the load command section
enough for us to inject the RPATHs later. We then proceed to link the
library or binary with -dead_strip_dylibs, and *after* the linking
inspect the library to find the left over (non-dead-stripped)
dependencies (using otool). We find the corresponding RPATHs for each
@rpath relative dependency, and inject them into the library or binary
using the install_name_tool. Thus achieving a deadstripped dylib (and
rpaths) build product.
We can not do this in GHC, without starting to reimplement a dynamic
linker as we do not know which symbols and subsequently libraries are
necessary.
Commissioned-by: Mercury Technologies, Inc. (mercury.com)
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In #18069 we are observing MVar deadlocks from somewhere in ghc.exe.
This use of MVar stood out as being one of the more likely culprits.
Here we make sure that it is exception-safe.
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Since Backpack the "home unit" is much more involved than what it was
before (just an identifier obtained with `-this-unit-id`). Now it is
used in conjunction with `-component-id` and `-instantiated-with` to
configure module instantiations and to detect if we are type-checking an
indefinite unit or compiling a definite one.
This patch introduces a new HomeUnit datatype which is much easier to
understand. Moreover to make GHC support several packages in the same
instances, we will need to handle several HomeUnits so having a
dedicated (documented) type is helpful.
Finally in #14335 we will also need to handle the case where we have no
HomeUnit at all because we are only loading existing interfaces for
plugins which live in a different space compared to units used to
produce target code. Several functions will have to be refactored to
accept "Maybe HomeUnit" parameters instead of implicitly querying the
HomeUnit fields in DynFlags. Having a dedicated type will make this
easier.
Bump haddock submodule
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- put panic related functions into GHC.Utils.Panic
- put trace related functions using DynFlags in GHC.Driver.Ppr
One step closer making Outputable fully independent of DynFlags.
Bump haddock submodule
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Previously to merge a set of object files we would invoke the linker as
usual, adding -r to the command-line. However, this can result in
non-sensical command-lines which causes lld to balk (#17962).
To avoid this we introduce a new tool setting into GHC, -pgmlm, which is
the linker which we use to merge object files.
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This updates haddock comments only.
This patch focuses to update for hyperlinks in GHC API's haddock comments,
because broken links especially discourage newcomers.
This includes the following hierarchies:
- GHC.Iface.*
- GHC.Llvm.*
- GHC.Rename.*
- GHC.Tc.*
- GHC.HsToCore.*
- GHC.StgToCmm.*
- GHC.CmmToAsm.*
- GHC.Runtime.*
- GHC.Unit.*
- GHC.Utils.*
- GHC.SysTools.*
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The terminology changed over time and now package databases contain
"units" (there can be several units compiled from a single Cabal
package: one per-component, one for each option set, one per
instantiation, etc.). We should try to be consistent internally and use
"units": that's what this renaming does. Maybe one day we'll fix the UI
too (e.g. replace -package-id with -unit-id, we already have
-this-unit-id and ghc-pkg has -unit-id...) but it's not done in this
patch.
* rename getPkgFrameworkOpts into getUnitFrameworkOpts
* rename UnitInfoMap into ClosureUnitInfoMap
* rename InstalledPackageIndex into UnitInfoMap
* rename UnusablePackages into UnusableUnits
* rename PackagePrecedenceIndex into UnitPrecedenceMap
* rename PackageDatabase into UnitDatabase
* rename pkgDatabase into unitDatabases
* rename pkgState into unitState
* rename initPackages into initUnits
* rename renamePackage into renameUnitInfo
* rename UnusablePackageReason into UnusableUnitReason
* rename getPackage* into getUnit*
* etc.
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* use UnitId instead of String to identify wired-in units
* use UnitId instead of Unit in the backend (Unit are only use by
Backpack to produce type-checked interfaces, not real code)
* rename lookup functions for consistency
* documentation
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