Thank you for the replies. These are what I got, correct me if I am wrong:

If I want to build ghc executables and standard libraries, all I need is to set perf-llvm.
And set perf-llvm or not does not effect the ability of ghc to use llvm.

Then how to check if the output files (executables, libraries) are generated by llvm, instead of gcc? In other words, to see if llvm was used correct.


On Wed, Feb 13, 2013 at 1:09 AM, Brandon Allbery <allbery.b@gmail.com> wrote:
On Tue, Feb 12, 2013 at 11:41 AM, Magicloud Magiclouds <magicloud.magiclouds@gmail.com> wrote:
  Then I `mv build.mk.sample build.mk`, set "BuildFlavour = perf-llvm", add "GhcWithLlvmCodeGen = YES". Finally `./configure --with-gcc=/usr/bin/llvm-gcc`. Configure output attached.

  After make, I tried `inplace/bin/ghc-stage2 –info`, it is still using native code generator. What should I do?​

1. I think --with-gcc= is independent of the llvm code generator.
2. Building the llvm codegen does not necessarily make it the *default* codegen; I think native remains default.  I don't know if there's a way to specify that llvm should be the default code generator.

fwiw, the ghc I have on here does not mention llvm in ghc --info, but ghc -fllvm at least tries to work.

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