K 10
svn:author
V 6
mikael
K 8
svn:date
V 27
2021-02-11T16:37:41.923083Z
K 7
svn:log
V 597
lang/ghc: use CONFIGURE_ENV instead of BINARY_ALIAS on arm

GHC saves the llvm command name (llc, opt, clang) found at compile time in its
settings file.
Using BINARY_ALIAS allows lang/ghc to build but breaks
ghc ports (devel/hs-cabal-install for example)
GHC configure script accepts now to define LLC, OPT, CLANG as
environment variable, switch to it.

<no location info>: error:
    Warning: Couldn't figure out LLVM version!
             Make sure you have installed LLVM 9

<no location info>: error: ghc: could not execute: opt-9.0

PR:		252166, 253367
Approved by:	portmgr (tier-2 blanket)

END