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* Add driver/ghci/ghci-wrapper.cabal to .gitignoreRyan Scott2021-02-011-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | After commit 55ef3bdc28681a22ceccf207707c49229f9b7559, running `./configure` now generates a `driver/ghci/ghci-wrapper.cabal` file from `driver/ghci/ghci-wrapper.cabal.in`, which pollutes the `git` tree: ``` $ git status On branch master Your branch is up to date with 'origin/master'. Untracked files: (use "git add <file>..." to include in what will be committed) driver/ghci/ghci-wrapper.cabal nothing added to commit but untracked files present (use "git add" to track) ``` Since `driver/ghci/ghci-wrapper.cabal` is autogenerated, the sensible thing to do is to add it to `.gitignore`. While I was in town, I also added the standard `*.in` file disclaimer to `driver/ghci/ghci-wrapper.cabal.in`. [ci skip]
* hadrian: Introduce ghci-wrapper packageBen Gamari2021-01-301-0/+6
| | | | | This wraps the existing GHCi wrapper script (driver/ghci/ghci.c) in a cabal file and adds the package to Hadrian.
* Add _validatebuild to .gitignoreCheng Shao2021-01-231-0/+1
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* .gitignore *.hiedb filesSebastian Graf2020-09-101-0/+3
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* Ignore more filesSven Tennie2020-08-311-2/+9
| | | | | Ignore files from "new style" cabal builds (dist-newstyle folders) and from clangd (C language server).
* Add docs/users_guide/.log to .gitignoreRyan Scott2019-10-141-1/+2
| | | | | | | | | | | | | | | | | | | When the users guide fails to build (as in #17346), a `docs/users_guide/.log` file will be generated with contents that look something like this: ``` WARNING: unknown config value 'latex_paper_size' in override, ignoring /home/rgscott/Software/ghc5/docs/users_guide/ghci.rst:3410: WARNING: u'ghc-flag' reference target not found: -pgmo ?option? /home/rgscott/Software/ghc5/docs/users_guide/ghci.rst:3410: WARNING: u'ghc-flag' reference target not found: -pgmo ?port? Encoding error: 'ascii' codec can't encode character u'\u27e8' in position 132: ordinal not in range(128) The full traceback has been saved in /tmp/sphinx-err-rDF2LX.log, if you want to report the issue to the developers. ``` This definitely should not be checked in to version control, so let's add this to `.gitignore`.
* Per stage headers, ghc_boot_platform.h -> stage 0 ghcplatform.hJohn Ericson2019-10-041-3/+1
| | | | | | | | | | | | | | | | | | The generated headers are now generated per stage, which means we can skip hacks like `ghc_boot_platform.h` and just have that be the stage 0 header as proper. In general, stages are to be embraced: freely generate everything in each stage but then just build what you depend on, and everything is symmetrical and efficient. Trying to avoid stages because bootstrapping is a mind bender just creates tons of bespoke mini-mind-benders that add up to something far crazier. Hadrian was pretty close to this "stage-major" approach already, and so was fairly easy to fix. Make needed more work, however: it did know about stages so at least there was a scaffold, but few packages except for the compiler cared, and the compiler used its own counting system. That said, make and Hadrian now work more similarly, which is good for the transition to Hadrian. The merits of embracing stage aside, the change may be worthy for easing that transition alone.
* Update .gitignoreMatthew Pickering2019-08-041-1/+11
| | | | Add some files generated by hadrian and some tooling files
* gitignore: Add .mypy_cacheBen Gamari2019-07-311-0/+1
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* Deduplicate "unique subdir" code between GHC and CabalJohn Ericson2019-07-091-1/+0
| | | | | | The code, including the generated module with the version, is now in ghc-boot. Config.hs reexports stuff as needed, ghc-pkg doesn't need any tricks at all.
* Add /includes/dist to .gitignoreRyan Scott2019-05-071-0/+1
| | | | | | | | | As of commit d37d91e9a444a7822eef1558198d21511558515e, the GHC build now autogenerates a `includes/dist/build/settings` file. To avoid dirtying the current `git` status, this adds `includes/dist` to `.gitignore`. [ci skip]
* Force LF line ending for md5sum [skip-ci]Tamar Christina2019-03-221-0/+1
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* Git ignore .hadrian_ghci (generated by the ./hadrian/ghci.sh)David Eichmann2019-03-151-0/+1
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* Rip out object splittingBen Gamari2019-03-051-1/+0
| | | | | | | | | | | | | | | The splitter is an evil Perl script that processes assembler code. Its job can be done better by the linker's --gc-sections flag. GHC passes this flag to the linker whenever -split-sections is passed on the command line. This is based on @DemiMarie's D2768. Fixes Trac #11315 Fixes Trac #9832 Fixes Trac #8964 Fixes Trac #8685 Fixes Trac #8629
* Cleanup iserv/iserv-proxyMoritz Angermann2019-02-281-0/+1
| | | | | | | | | | | | This adds trace messages that include the processes name and as such make debugging and following the communication easier. It also adds a note regarding the fwd*Call proxy-communication logic between the proxy and the slave. The proxy will now also poll for 60s to wait for the remote iserv to come up. (Alternatively you can start the remote process beforehand; and just have iserv-proxy connect to it)
* Bump ghc version to 8.9Ryan Scott2019-02-201-0/+1
| | | | | | | Along the way, I discovered that `template-haskell.cabal` was hard-coding the GHC version (in the form of its `ghc-boot-th` version bounds), so I decided to make life a little simpler in the future by generating `template-haskell.cabal` with autoconf.
* Use autoconf to generate version numbers for libiserv and friendsRyan Scott2018-11-261-1/+4
| | | | | | | | | | | | | | | | | | | | | Summary: Currently, the version numbers for `libiserv`, `iserv`, and `iserv-proxy` are hard-coded directly into their `.cabal` files. These are easy to forget to update, and in fact, this has already happened once (see #15866). Let's use `autoconf` to do this for us so that it is not forgotten in the future. Test Plan: ./validate Reviewers: bgamari Reviewed By: bgamari Subscribers: rwbarton, erikd, carter GHC Trac Issues: #15866 Differential Revision: https://phabricator.haskell.org/D5302
* Ignore .gdb_history filesBen Gamari2018-11-111-0/+1
| | | | | | | | | | | | Summary: I tend to accumulate these and they are often quite useful to keep around. Reviewers: monoidal Reviewed By: monoidal Subscribers: rwbarton, carter Differential Revision: https://phabricator.haskell.org/D5320
* resolve T13704chessai2018-10-021-1/+7
| | | | | | | | | | | | | | | | | Summary: allow -main-is to change export list for default module header, allowing one to change the entry point to one's program. Test Plan: ./validate Reviewers: bgamari, nomeata, mpickering Reviewed By: mpickering Subscribers: mpickering, rwbarton, carter GHC Trac Issues: #13704 Differential Revision: https://phabricator.haskell.org/D5189
* Use -fobject-code in the GHCi script for loading GHCMichael Sloan2018-08-061-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | Summary: My very last commit to D4904 removed -fobject-code. I should have tested this more thoroughly, because it is required to do a fresh ghci load, as some code uses unboxed tuples. One of my motivations for doing this was that if you run the script without passing -odir / -hidir, it would pollute the source tree with .hi and .o files. This also appeared to break subsequent builds. I've made it much less likely that this will happen by instead specifying -odir and -hidir within the ghci script rather than on the commandline. I plan to open a separate diff which adds a test that these scripts work. Until this patch is merged, the workaround is to do `./utils/ghc-in-ghci/run.sh -fobject-code` Reviewers: bgamari, alpmestan, monoidal Reviewed By: alpmestan, monoidal Subscribers: alpmestan, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D5015
* Embrace -XTypeInType, add -XStarIsTypeVladislav Zavialov2018-06-141-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: Implement the "Embrace Type :: Type" GHC proposal, .../ghc-proposals/blob/master/proposals/0020-no-type-in-type.rst GHC 8.0 included a major change to GHC's type system: the Type :: Type axiom. Though casual users were protected from this by hiding its features behind the -XTypeInType extension, all programs written in GHC 8+ have the axiom behind the scenes. In order to preserve backward compatibility, various legacy features were left unchanged. For example, with -XDataKinds but not -XTypeInType, GADTs could not be used in types. Now these restrictions are lifted and -XTypeInType becomes a redundant flag that will be eventually deprecated. * Incorporate the features currently in -XTypeInType into the -XPolyKinds and -XDataKinds extensions. * Introduce a new extension -XStarIsType to control how to parse * in code and whether to print it in error messages. Test Plan: Validate Reviewers: goldfire, hvr, bgamari, alanz, simonpj Reviewed By: goldfire, simonpj Subscribers: rwbarton, thomie, mpickering, carter GHC Trac Issues: #15195 Differential Revision: https://phabricator.haskell.org/D4748
* Move `iserv` into `utils` and change package name from `iserv-bin` to `iserv`Moritz Angermann2018-06-071-2/+1
| | | | | | | | | | | | | | | | | | This is done for consistency. We usually call the package file the same name the folder has. The move into `utils` is done so that we can move the library into `libraries/iserv` and the proxy into `utils/iserv-proxy` and then break the `iserv.cabal` apart. This will make building the cross compiler with TH simpler, because we can build the library and proxy as separate packages. Test Plan: ./validate Reviewers: bgamari, goldfire, erikd Reviewed By: bgamari Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4436
* Add HeapView functionalityPatrick Dougherty2018-05-201-0/+1
| | | | | | | | | | | | | | | | | | | | | This pulls parts of Joachim Breitner's ghc-heap-view library inside GHC. The bits added are the C hooks into the RTS and a basic Haskell wrapper to these C hooks. The main reason for these to be added to GHC proper is that the code needs to be kept in sync with the closure types defined by the RTS. It is expected that the version of HeapView shipped with GHC will always work with that version of GHC and that extra functionality can be layered on top with a library like ghc-heap-view distributed via Hackage. Test Plan: validate Reviewers: simonmar, hvr, nomeata, austin, Phyx, bgamari, erikd Reviewed By: bgamari Subscribers: carter, patrickdoc, tmcgilchrist, rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3055
* Remove MAX_PATH restrictions from RTS, I/O manager and various utilitiesTamar Christina2018-03-311-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: This shims out fopen and sopen so that they use modern APIs under the hood along with namespaced paths. This lifts the MAX_PATH restrictions from Haskell programs and makes the new limit ~32k. There are only some slight caveats that have been documented. Some utilities have not been upgraded such as lndir, since all these things are different cabal packages I have been forced to copy the source in different places which is less than ideal. But it's the only way to keep sdist working. Test Plan: ./validate Reviewers: hvr, bgamari, erikd, simonmar Reviewed By: bgamari Subscribers: rwbarton, thomie, carter GHC Trac Issues: #10822 Differential Revision: https://phabricator.haskell.org/D4416
* Add bindist-list.uniq to .gitignoreÖmer Sinan Ağacan2018-03-071-0/+1
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* Update .gitignoreÖmer Sinan Ağacan2018-02-261-0/+2
| | | | | | | | | | Reviewers: bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4446
* Revert "Move `iserv` into `utils` and change package nameBen Gamari2018-02-201-1/+2
| | | | | | See Phab:D4377 for the rationale. We will try this again. This reverts commit 7c173b9043f7a9a5da46c5b0cc5fc3b38d1a7019.
* Move `iserv` into `utils` and change package name from `iserv-bin` to `iserv`Moritz Angermann2018-02-151-2/+1
| | | | | | | | | | | | | | | | This is done for consistency. We usually call the package file the same name the folder has. The move into `utils` is done so that we can move the library into `libraries/iserv` and the proxy into `utils/iserv-proxy` and then break the `iserv.cabal` apart. This will make building the cross compiler with TH simpler, because we can build the library and proxy as separate packages. Reviewers: bgamari, simonmar, goldfire, erikd Reviewed By: simonmar Subscribers: tdammers, rwbarton, thomie, carter Differential Revision: https://phabricator.haskell.org/D4377
* Remove hadrian sub-dir from .gitignoreMatthew Pickering2017-11-211-1/+0
| | | | | | | | | | Reviewers: bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D4206
* Fix rts.cabal.inMoritz Angermann2017-11-181-0/+1
| | | | | | | | | | Overlap with commit 2f463873, resulted in `hooks/LongGCSync.c` missing from the `rts.cabal.in` file. As the `rts.cabal` file is only used by hadrian, this did not trigger with the make base build system which can do globbing. Also ignore the `rts.cabal` file, as it's generated by configure from the `rts.cabal.in`.
* Revert "Move check-ppr and check-api-annotations to testsuite/utils"Ben Gamari2017-11-021-1/+0
| | | | | | | | Unfortunately this (ironically) ended up breaking bindist testing since we didn't have a package-data.mk. Unfortunately there is no easy way to fix this. This reverts commit 1e9f90af7311c33de0f7f5b7dba594725596d675.
* Move check-ppr and check-api-annotations to testsuite/utilsBen Gamari2017-09-271-0/+1
| | | | | | | | | | | | | | | | | These are needed by the testsuite and consequently must be shipped in the testsuite tarball to ensure that we can test binary distributions. See #13897. Test Plan: Validate Reviewers: austin Subscribers: snowleopard, rwbarton, thomie GHC Trac Issues: #13897 Differential Revision: https://phabricator.haskell.org/D4039
* Add gen-dll as replacement for dll-splitTamar Christina2017-08-291-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: This tool can be used to generate dll's for any list of object files given to it. It will then repartition them automatically to fit within a dll and generates as many dll's as needed to do this. Cyclic dependencies between these generated dlls are handle automatically so there is no need to tell it how to partition. It is also a lot more general than `dll-split` as it is able to split any package not just `libGHC`. It also uses a trick using GNU style import libraries to hide the splitting from the rest of the pipeline. Which means come linking time you don't need to know which dll contains what symbol or how many split dlls were created. The import libraries are by default created with libtool. However since libtool is BFD based it is very slow. So if present and detected by configure the `genlib` tool from the msys2 project is used. This makes a difference of about ~45 minutes when compiling. To install `genlib` run `pacman -Sy mingw-w64-$(uname -m)-tools-git`. More detailed explaination of the process can be found here https://ghc.haskell.org/trac/ghc/wiki/WindowsDynamicLinking Test Plan: ./validate Reviewers: austin, hvr, bgamari, erikd, simonmar Reviewed By: bgamari Subscribers: snowleopard, rwbarton, thomie, erikd, #ghc_windows_task_force GHC Trac Issues: #5987 Differential Revision: https://phabricator.haskell.org/D3883
* users_guide: Convert mkUserGuidePart generation to a Sphinx extensionPatrick Dougherty2017-08-181-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This removes all dependencies the users guide had on `mkUserGuidePart`. The generation of the flag reference table and the various pieces of the man page is now entirely contained within the Spinx extension `flags.py`. You can see the man page generation on the orphan page https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ghc.html The extension works by collecting all of the meta-data attached to the `ghc-flag` directives and then formatting and displaying it at `flag-print` directives. There is a single printing directive that can be customized with two options, what format to display (table, list, or block of flags) and an optional category to limit the output to (verbosity, warnings, codegen, etc.). New display formats can be added by creating a function `generate_flag_xxx` (where `xxx` is a description of the format) which takes a list of flags and a category and returns a new `xxx`. Then just add a reference in the dispatch table `handlers`. That display can now be run by passing `:type: xxx` to the `flag-print` directive. `flags.py` contains two maps of settings that can be adjusted. The first is a canonical list of flag categories, and the second sets default categories for files. The only functionality that Sphinx could not replace was the `what_glasgow_exts_does.gen.rst` file. `mkUserGuidePart` actually just reads the list of flags from `compiler/main/DynFlags.hs` which Sphinx cannot do. As the flag is deprecated, I added the list as a static file which can be updated manually. Additionally, this patch updates every single documented flag with the data from `mkUserGuidePart` to generate the reference table. Fixes #11654 and, incidentally, #12155. Reviewers: austin, bgamari Subscribers: rwbarton, thomie GHC Trac Issues: #11654, #12155 Differential Revision: https://phabricator.haskell.org/D3839
* Add the bootstrapping/ dir to .gitignoreRyan Scott2017-08-021-0/+1
| | | | | | | | | | Summary: This is generated when building `ghc-cabal`. Reviewers: hvr, bgamari, austin Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3813
* testsuite: Produce JUnit outputBen Gamari2017-07-281-0/+1
| | | | | | | | | | | | Test Plan: Validate, try ingesting into Jenkins. Reviewers: austin Subscribers: rwbarton, thomie GHC Trac Issues: #13716 Differential Revision: https://phabricator.haskell.org/D3796
* Remove very broad ignore. [ci skip]Tamar Christina2017-02-011-1/+0
| | | | | | | | | | | | Summary: `.gitignore` contains a very broad ignore entry for `foo*`. This has bitten us before and should probably be removed. Reviewers: bgamari, austin Subscribers: simonpj, thomie Differential Revision: https://phabricator.haskell.org/D3054
* Add mkUserGuidePart.cabal to .gitignoreRyan Scott2017-01-111-0/+1
| | | | Following fe75d2d4db44cee72d505bba24bd44c1a2a75613.
* Add entry to .gitignore to for __.SYMDEF_SORTEDJohn Leo2016-12-151-0/+1
| | | | | | | | | | | | | | | libraries/integer-gmp/gmp/objs/__.SYMDEF SORTED is created by Mac OS builds. Test Plan: validate Reviewers: austin, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2840
* Ignore Hadrian build products.Edward Z. Yang2016-11-211-0/+7
| | | | | | | | | | | | Test Plan: none Reviewers: austin, snowleopard, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2722
* Testsuite: validate the tests/stage1 directory with the stage1 compilerThomas Miedema2016-06-181-2/+2
| | | | | | | | | | | * See `Note [Why is there no stage1 setup function?]`. * Move T2632 to the tests/stage1 directory (#10382). Reviewed by: ezyang, nomeata, bgamari Differential Revision: https://phabricator.haskell.org/D2341 GHC Trac Issues: #12197
* Testsuite: run tests in <testdir>.run instead of /tmpThomas Miedema2016-06-181-0/+3
| | | | | | | | | | | | | | | | | | | | As discussed in Phab:D1187, this approach makes it a bit easier to inspect the test directory while working on a new test. The only tests that needed changes are the ones that refer to files in ancestor directories. Those files are now copied directly into the test directory. validate still runs the tests in a temporary directory in /tmp, see `Note [Running tests in /tmp]` in testsuite/driver/runtests.py. Update submodule hpc. Reviewed by: simonmar Differential Revision: https://phabricator.haskell.org/D2333 GHC Trac Issues: #11980
* Add to .gitignoreSimon Peyton Jones2016-06-131-0/+3
| | | | | | | This adds *.patch *.stackdump (Windows) foo* (simonpj uses foo* for junk files)
* Add libraries/ghci/GNUmakefile to .gitignore [skip ci]Thomas Miedema2016-05-191-0/+1
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* Move Extension type to ghc-boot-thBen Gamari2016-05-161-0/+3
| | | | | | | | | | | | | | | | | | | | This creates a new package, `ghc-boot-th`, to contain the `Extension` type, which now lives in `GHC.LanguageExtension.Type`. This ensures that the transitive dependency set of the `template-haskell` package remains minimal. The `GHC.LanguageExtensions.Type` module is also re-exported by `ghc-boot`, which provides an orphan `binary` instance as well. Test Plan: Validate Reviewers: goldfire, thomie, hvr, austin Reviewed By: thomie Subscribers: RyanGlScott, thomie, erikd, ezyang Differential Revision: https://phabricator.haskell.org/D2224
* Enable RemoteGHCi on WindowsTamar Christina2016-01-271-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Makes the needed changes to make RemoteGHCi work on Windows. The approach passes OS Handles areound instead of the Posix Fd as on Linux. The reason is that I could not find any real documentation about the behaviour of Windows w.r.t inheritance and Posix FDs. The implementation with Fd did not seem to be able to find the Fd in the child process. Instead I'm using the much better documented approach of passing inheriting handles. This requires a small modification to the `process` library. https://github.com/haskell/process/pull/52 Test Plan: ./validate On Windows x86_64 Reviewers: thomie, erikd, bgamari, simonmar, austin, hvr Reviewed By: simonmar Subscribers: #ghc_windows_task_force Differential Revision: https://phabricator.haskell.org/D1836 GHC Trac Issues: #11100
* Don't output manpage in same directory as sourceBen Gamari2016-01-151-0/+1
| | | | | | | | | | Test Plan: Validate Reviewers: austin, thomie, nomeata Differential Revision: https://phabricator.haskell.org/D1782 GHC Trac Issues: #11433
* Synchronise ghci-package version with ghc-packageHerbert Valerio Riedel2015-12-281-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | In order to simplify the task, the version munging logic has been radically simplified: Previously, in cases where the version contained dates as version components, the build-system would munge the version of the stage1 ghc package before registering the `ghc` package. However, this hack was already questionable at the time of its introduction (c.f. 7b45c46cbabe1288ea87bd9b94c57e010ed17e60). Simplifying the build-systems by avoiding such hacks may also help the shaking-up-ghc effort. So now we simply munge directly via the `.cabal` files, which gives a simpler picture, as now every stage is munged the same. Munging is only active when the first patch-level version component is a date. So stable snapshots and release candidates are unaffacted (as those have the date in the second patch-level version component) Reviewers: simonmar, bgamari, austin, thomie, ezyang Reviewed By: bgamari, thomie, ezyang Differential Revision: https://phabricator.haskell.org/D1673
* Documentation, tests for hsc2hs's new #alignment macroRyanGlScott2015-12-191-0/+1
| | | | | | | | | | | | | | Adds two tests (one for Trac #4340 and one for Trac #10272), as well as advice on how to fix your code if `hsc2hs` emits warnings with GHC 8.0 due to a redefinition of `#alignment`. (I also put the advice in the [GHC 8.0 Migration Guide](https://ghc.haskell.org/trac/ghc/wiki/Migration/8.0).) Reviewed By: thomie Differential Revision: https://phabricator.haskell.org/D1663 GHC Trac Issues: #4340, #10272
* Remote GHCi, -fexternal-interpreterSimon Marlow2015-12-171-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Summary: (Apologies for the size of this patch, I couldn't make a smaller one that was validate-clean and also made sense independently) (Some of this code is derived from GHCJS.) This commit adds support for running interpreted code (for GHCi and TemplateHaskell) in a separate process. The functionality is experimental, so for now it is off by default and enabled by the flag -fexternal-interpreter. Reaosns we want this: * compiling Template Haskell code with -prof does not require building the code without -prof first * when GHC itself is profiled, it can interpret unprofiled code, and the same applies to dynamic linking. We would no longer need to force -dynamic-too with TemplateHaskell, and we can load ordinary objects into a dynamically-linked GHCi (and vice versa). * An unprofiled GHCi can load and run profiled code, which means it can use the stack-trace functionality provided by profiling without taking the performance hit on the compiler that profiling would entail. Amongst other things; see https://ghc.haskell.org/trac/ghc/wiki/RemoteGHCi for more details. Notes on the implementation are in Note [Remote GHCi] in the new module compiler/ghci/GHCi.hs. It probably needs more documenting, feel free to suggest things I could elaborate on. Things that are not currently implemented for -fexternal-interpreter: * The GHCi debugger * :set prog, :set args in GHCi * `recover` in Template Haskell * Redirecting stdin/stdout for the external process These are all doable, I just wanted to get to a working validate-clean patch first. I also haven't done any benchmarking yet. I expect there to be slight hit to link times for byte code and some penalty due to having to serialize/deserialize TH syntax, but I don't expect it to be a serious problem. There's also lots of low-hanging fruit in the byte code generator/linker that we could exploit to speed things up. Test Plan: * validate * I've run parts of the test suite with EXTRA_HC_OPTS=-fexternal-interpreter, notably tests/ghci and tests/th. There are a few failures due to the things not currently implemented (see above). Reviewers: simonpj, goldfire, ezyang, austin, alanz, hvr, niteria, bgamari, gibiansky, luite Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D1562
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