Ticket #5782 (closed bug: fixed)
llvm --enable-tbaa forces LLVM to be 2.9 or above
I compiled the latest master against LLVM 2.8. The compile worked initially, but when using the ghc-stage2 compiler against new code with the fllvm option, all programs fail to compile with: opt: Unknown command line argument '--enable-tbaa=true'. Try: 'opt -help'
This is the result of the following flags being added to: ghc/compiler/main/DriverPipeline.hs
tbaa | dopt Opt_LlvmTBAA dflags = "--enable-tbaa=true"
| otherwise = "--enable-tbaa=false"
--enable-tbaa is available on opt version 2.9 and above only.
It would be helpful if the ./configure script verified that the opt (and possibly llc) versions were 2.9 or above.