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Bump minimal supported LLVM version to 9 #78848

Merged
merged 7 commits into from
Nov 15, 2020
Merged

Bump minimal supported LLVM version to 9 #78848

merged 7 commits into from
Nov 15, 2020

Commits on Nov 12, 2020

  1. Bumped minimal tested LLVM version to 9 

    This bumps the minimal tested llvm version to 9.
This should enable supporting newer LLVM features (and CPU extensions).
    @DevJPM
    DevJPM committed Nov 12, 2020
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  2. explicitly add llvm-9-dev in dockerfile 

    apparently llvm-8-tools already had llvm-8-dev as a dependency
which was removed in llvm-9-tools, so we need to explicitly pull
llvm-9-dev to make a build
    @DevJPM
    DevJPM committed Nov 12, 2020
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  3. Bump the minimal supported LLVM version in the bootstrapping code to 9.0

    @DevJPM
    DevJPM committed Nov 12, 2020
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  4. fully exploited the dropped support of LLVM 8 

    This commit grepped for LLVM_VERSION_GE, LLVM_VERSION_LT, get_major_version and
min-llvm-version and statically evaluated every expression possible
(and sensible) assuming that the LLVM version is >=9 now
    @DevJPM
    DevJPM committed Nov 12, 2020
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  5. Removed an unused function now that LLVM 9 is the minimal supported v… 

    …ersion

The function was only used in LLVM 8 compatibility code
and was found and flagged by dead code detection and now removed.
    @DevJPM
    DevJPM committed Nov 12, 2020
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  6. Dropped Support for Bidirectional Custom Target Definition Emulation 

    as requested in the review and argued that this is only consistent with later LLVM upgrades
    @DevJPM
    DevJPM committed Nov 12, 2020
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  7. fixed a re-format due to removed chain call

    @DevJPM
    DevJPM committed Nov 12, 2020
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