Unrecognized --compiler flag?

[blankhart]

Cabal 2.4.1.0 does not seem to recognize the --compiler flag on the command line:

cabal: unrecognized 'new-build' option `--compiler=ghcjs'

The documentation (https://cabal.readthedocs.io/en/latest/nix-local-build.html) suggests that this option should be recognized.

For background I am trying to build a GHCJS project that succeeds when the following is in the cabal.project file, but fails when the toolchain is omitted:

compiler: ghcjs
with-compiler: /opt/ghcjs/8.4/bin/ghcjs
with-hc-pkg: /opt/ghcjs/8.4/bin/ghcjs-pkg

Without specifying the compiler toolchain, Cabal produces the following error (using installations from hvr's very useful Ubuntu PPA):

> cabal new-build client --with-compiler=ghcjs-8.4.0.1 --with-hc-pkg=ghcjs-pkg-8.4.0.1
cabal: Version mismatch between ghc and ghc-pkg: /opt/ghcjs/bin/ghcjs-8.4.0.1 is version 8.4.0.1 /opt/ghcjs/bin/ghcjs-pkg-8.4.0.1 is version 8.4.2.20180420

[phadej]

Try bare `--ghcjs`

…

Sent from my iPhone

On 20 Apr 2019, at 20.40, blankhart ***@***.***> wrote: Cabal 2.4.1.0 does not seem to recognize the --compiler flag on the command line: cabal: unrecognized 'new-build' option `--compiler=ghcjs' The documentation (https://cabal.readthedocs.io/en/latest/nix-local-build.html) suggests that this option should be recognized. For background I am trying to build a GHCJS project that succeeds when the following is in the cabal.project file, but fails when the toolchain is omitted: compiler: ghcjs with-compiler: /opt/ghcjs/8.4/bin/ghcjs with-hc-pkg: /opt/ghcjs/8.4/bin/ghcjs-pkg Without specifying the compiler toolchain, Cabal produces the following error (using installations from hvr's very useful Ubuntu PPA): > cabal new-build client --with-compiler=ghcjs-8.4.0.1 --with-hc-pkg=ghcjs-pkg-8.4.0.1 cabal: Version mismatch between ghc and ghc-pkg: /opt/ghcjs/bin/ghcjs-8.4.0.1 is version 8.4.0.1 /opt/ghcjs/bin/ghcjs-pkg-8.4.0.1 is version 8.4.2.20180420 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[blankhart]

It builds with that change, thanks. I.e., using

> cabal new-build client --ghcjs --with-compiler=ghcjs-8.4.0.1 --with-hc-pkg=ghcjs-pkg-8.4.0.1

And not:

> cabal new-build client --compiler=ghcjs --with-compiler=ghcjs-8.4.0.1 --with-hc-pkg=ghcjs-pkg-8.4.0.1

Glad to close this issue but would note that the --ghcjs flag seems to be undocumented.