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This patch disables the use of some GHC extensions in
Safe mode and also the use of certain flags. Some
are disabled completely while others are only allowed
on the command line and not in source PRAGMAS.
We also check that Safe imports are indeed importing
a Safe or Trustworthy module.
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Module imports form a cycle:
module `Foo4' imports `Foo'
which imports `Foo2'
which imports `Foo3'
which imports `Foo4'
as requested by Bryan Richter
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Now GHC still generates the _stub.c files, but the object file is
automatically merged into the main .o file for a module. This means
that build systems (including GHC's own) no longer need to worry about
looking for _stub.o files and including them when linking.
I had to do lots of refactoring in DriverPipeline to make this work;
now there's a monad to carry around all the information, and
everything is a lot tidier.
The _stub.c is now created as a temporary file and removed after
compilation (unless the -keep-tmp-files flag is on).
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There are two things going on in main/GHC.hs.
* It's the root module of the GHC package
* It contains lots of stuff for --make
It is also gigantic (2.7k lines)
This patch splits it into two
* GHC.hs is the root module for the GHC package
(1.3k lines)
* GhcMake.hs contains the stuff for --make
(1.4k lines)
Happily the functional split divided it almost
exactly in half.
This is a pure refactoring. There should be no
behavioural change.
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