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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #14982
Closed
Open
Issue created Mar 28, 2018 by Thomas Main DuBuisson@tommdReporter

LLVM default -mcpu setting inhibits customization

With GHC 8.4.1 we are now passing a default -mcpu selection to llvm. This default is passed regardless of any explicit command line option such as -optlc=-mcpu=native. If/when the user explicitly specifies the architecture we now get a failed build. The error message from LLVM is:

llc: for the -mcpu option: may only occur zero or one times!
`llc' failed in phase `LLVM Compiler'. (Exit code: 1)

This is when compiling with GHC 8.4.1 as such:

{{{ ghc-8.4.1 -fforce-recomp -fllvm -optlc=-mcpu=native -O2 tt.hs }}

I suggest we either check for a user option of mcpu before adding the default or revert this behavior and allow llvm to take it's (optimistic and less portable) default.

Trac metadata
Trac field Value
Version 8.4.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (LLVM)
Test case
Differential revisions
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