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When GHC links binaries on windows, we pass a -L and -l flag
to gcc for each dependency in the transitive dependency
closure. As this will usually overflow the command argument
limit on windows, we use response files to pass all arguments
to gcc. gcc however internally passes only the -l flags via
a response file to the collect2 command, but puts the -L flags
on the command line. As such if we pass enough -L flags to
gcc--even via a response file--we will eventually overflow the
command line argument length limit due to gcc passing them
to collect2 without resorting to a response file.
To prevent this from happening we move all lirbaries into a
shared temporary folder, and only need to pass a single -L
flag to gcc. Ideally however this was fixed in gcc.
Reviewers: bgamari, Phyx
Reviewed By: bgamari
Subscribers: erikd, rwbarton, thomie, carter
Differential Revision: https://phabricator.haskell.org/D4762
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This switches the compiler/ component to get compiled with
-XNoImplicitPrelude and a `import GhcPrelude` is inserted in all
modules.
This is motivated by the upcoming "Prelude" re-export of
`Semigroup((<>))` which would cause lots of name clashes in every
modulewhich imports also `Outputable`
Reviewers: austin, goldfire, bgamari, alanz, simonmar
Reviewed By: bgamari
Subscribers: goldfire, rwbarton, thomie, mpickering, bgamari
Differential Revision: https://phabricator.haskell.org/D3989
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Hopefully we can get rid of libtool, by using ar only
Depends on: D3579
Test Plan: validate
Reviewers: austin, hvr, bgamari, erikd
Reviewed By: bgamari
Subscribers: rwbarton, thomie, erikd
Differential Revision: https://phabricator.haskell.org/D3721
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Remove filesToNotIntermediateClean from DynFlags, create a data type
FilesToClean, and change filesToClean in DynFlags to be a FilesToClean.
Modify SysTools.newTempName and the Temporary constructor of
PipelineMonad.PipelineOutput to take a TempFileLifetime, which specifies
whether a temp file should live until the end of GhcMonad.withSession,
or until the next time cleanIntermediateTempFiles is called.
These changes allow the cleaning of intermediate files in GhcMake to be
much more efficient.
HscTypes.hptObjs is removed as it is no longer used.
A new performance test T13701 is added, which passes both with and
without -keep-tmp-files. The test fails by 25% without the patch, and
passes when -keep-tmp-files is added.
Note that there are still at two hotspots caused by
algorithms quadratic in the number of modules, however neither of them
allocate. They are:
* DriverPipeline.compileOne'.needsLinker
* GhcMake.getModLoop
DriverPipeline.compileOne'.needsLinker is changed slightly to improve
the situation.
I don't like adding these Types to DynFlags, but they need to be seen by
Dynflags, SysTools and PipelineMonad. The alternative seems to be to
create a new module.
Reviewers: austin, hvr, bgamari, dfeuer, niteria, simonmar, erikd
Reviewed By: simonmar
Subscribers: rwbarton, thomie
GHC Trac Issues: #13701
Differential Revision: https://phabricator.haskell.org/D3620
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