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Dynamic-by-default was a mechanism to automatically select the -dynamic
way for some targets.
It was implemented in a convoluted way: it was defined as a flavour
option, hence it couldn't be passed as a global settings (which are
produced by `configure` before considering flavours), so a build system
rule was used to pass -DDYNAMIC_BY_DEFAULT to the C compiler so that
deriveConstants could infer it.
* Make build system has it disabled for 8 years (951e28c0625ece7e0db6ac9d4a1e61e2737b10de)
* It has never been implemented in Hadrian
* Last time someone tried to enable it 1 year ago it didn't work (!2436)
* Having this as a global constant impedes making GHC multi-target (see !5427)
This commit fully removes support for dynamic-by-default. If someone
wants to reimplement something like this, it would probably need to move
the logic in the compiler.
(Doing this would probably need some refactoring of the way the compiler
handles DynFlags: DynFlags are used to store and to pass enabled ways to
many parts of the compiler. It can be set by command-line flags, GHC
API, global settings. In multi-target GHC, we will use DynFlags to load
the target platform and its constants: but at this point with the
current DynFlags implementation we can't easily update the existing
DynFlags with target-specific options such as dynamic-by-default without
overriding ways previously set by the user.)
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* replace integer-* package selection with ghc-bignum backend selection
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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
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Build times when using the quick flavour:
stage1 opt | time (wall) | time (user)
-O1 | 13m | 53m
-O2 | 13m | 51m
So even when we compile stage2 with -O0 (quick)
using -O2 on stage1 is already faster.
The difference is even bigger when freezing
stage1 and doing multiple builds or compiling
stage2 with optimizations.
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Our *-cross flavours force -fllvm, this adds flavours for cross
compilation to x86_64, where we can use our native code generator.
Test Plan: ./validate
Reviewers: bgamari
Reviewed By: bgamari
Subscribers: rwbarton, thomie, carter
Differential Revision: https://phabricator.haskell.org/D4443
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