ghc: Bugfix build

[essandess]

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS x.y
Xcode x.y / Command Line Tools x.y.z

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[reneeotten]

@essandess this still fails on every CI run; please take a look

[essandess]

@essandess this still fails on every CI run; please take a look

Thanks, I believe that this is an issue I created with the haskell_cabal.use_prebuilt ports in 3935297, specifically hadrian. This fix to PG haskell_cabal should address it.

[neverpanic]

With this change, alex builds fine, but happy is broken in the same way:

:info:build Executing:  cd "/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/happy-1.20.1.1" && /opt/local/bin/cabal-prebuilt --config-file=/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/.home/.cabal/config --store-dir=/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/.home/.cabal/store build happy -j12 --builddir=/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/dist --ghc --with-compiler=/opt/local/bin/ghc --prefix=/opt/local --datadir=/opt/local/share/happy --docdir=/opt/local/share/doc/happy --htmldir=/opt/local/share/doc/happy --haddockdir=/opt/local/share/doc/happy --sysconfdir=/opt/local/etc/happy --bindir=/opt/local/bin --datadir=/opt/local/share/happy 
:debug:build system:  cd "/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/happy-1.20.1.1" && /opt/local/bin/cabal-prebuilt --config-file=/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/.home/.cabal/config --store-dir=/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/.home/.cabal/store build happy -j12 --builddir=/opt/local/var/macports/build/_opt_dports_devel_happy/happy/work/dist --ghc --with-compiler=/opt/local/bin/ghc --prefix=/opt/local --datadir=/opt/local/share/happy --docdir=/opt/local/share/doc/happy --htmldir=/opt/local/share/doc/happy --haddockdir=/opt/local/share/doc/happy --sysconfdir=/opt/local/etc/happy --bindir=/opt/local/bin --datadir=/opt/local/share/happy 
:info:build Error: [Cabal-5490]
:info:build Cannot find the program 'ghc'. User-specified path '/opt/local/bin/ghc' does not refer to an executable and the program is not on the system path.

[jrabinow]

I also have:

• hadrian which depends on ghc binary being in the path
• cabal which depends on ghc-pkg binary being in the path

[essandess]

@reneeotten @neverpanic This fix can be merged now.

I previously added the explicit-but-likely-unnecessary flags --ghc --with-compiler= after the update to the latest cabal version to troubleshoot a CI failure on that PR.