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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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When CrossCompiling=YES or Stage1Only=YES, building the haddocks and the
User's Guide should be skipped, because haddock and mkUserGuidePart
depend on the GHC API.
See Note [No stage2 packages when CrossCompiling or Stage1Only] for
details.
There are several places in the build system where the variables
HADDOCK_DOCS and BUILD_SPHINX_* are checked. Instead of also checking
for the variables CrossCompiling or Stage1Only in all those places,
`make` will now exit with a nice error message when the user requests
the impossible.
Reviewers: rwbarton, austin, bgamari
Reviewed By: bgamari
Differential Revision: https://phabricator.haskell.org/D1882
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This allows easier diffing of different BuildFlavours, including
`mk/flavours/validate.mk`.
Reviewed By: bgamari, austin
Differential Revision: https://phabricator.haskell.org/D1050
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