--- JPMoresmau ------
First package to fail is exceptions. Just open a console and type in
cabal install exceptions
EclipseFP tries to put some parallel install flags that may make the errors less visible (a Cabal thing, not an EclipseFP thing). I really don't like the look of getting warnings in c code, though...
--- haskell_beginner ------
$ cabal install exceptions
Resolving dependencies...
Configuring exceptions-0.6.1...
/var/folders/3r/gvk584k50jb253024p4wxy3r0000gn/T/5187.c:1:12:
warning: control reaches end of non-void function [-Wreturn-type]
int foo() {}
^
1 warning generated.
Building exceptions-0.6.1...
Preprocessing library exceptions-0.6.1...
<command line>: cannot satisfy -package-id mtl-2.1.2-94c72af955e94b8d7b2f359dadd0cb62
(use -v for more information)
Failed to install exceptions-0.6.1
cabal: Error: some packages failed to install:
exceptions-0.6.1 failed during the building phase. The exception was:
ExitFailure 1
$
What flags can I add to that to get a better error message?
EDIT TO ADD:
Again if there is another layer automatically adding flags to the above command, I know nothing about it. This includes if Haskell or cabal uses a config file. I am on a — to my knowledge — completely stock install of Haskell for Mac OS.
--- JPMoresmau ------
cabal install -v exceptions
May give more info about why the mtl package cannot be satisfied when it seems to have been installed.
--- haskell_beginner ------
$ cabal install -v exceptions
Reading available packages...
Choosing modular solver.
Resolving dependencies...
Ready to install exceptions-0.6.1
Waiting for install task to finish...
Extracting
to /var/folders/3r/gvk584k50jb253024p4wxy3r0000gn/T/exceptions-0.6.1-5256...
Updating exceptions.cabal with the latest revision from the index.
Configuring exceptions-0.6.1...
Dependency base ==4.6.0.1: using base-4.6.0.1
Dependency mtl ==2.1.2: using mtl-2.1.2
Dependency transformers ==0.3.0.0: using transformers-0.3.0.0
/var/folders/3r/gvk584k50jb253024p4wxy3r0000gn/T/5256.c:1:12:
warning: control reaches end of non-void function [-Wreturn-type]
int foo() {}
^
1 warning generated.
Using Cabal-1.16.0 compiled by ghc-7.6
Using compiler: ghc-7.6.3
Using install prefix:
/Users/person/Library/Haskell/ghc-7.6.3/lib/exceptions-0.6.1
Binaries installed in:
/Users/person/Library/Haskell/ghc-7.6.3/lib/exceptions-0.6.1/bin
Libraries installed in:
/Users/person/Library/Haskell/ghc-7.6.3/lib/exceptions-0.6.1/lib
Private binaries installed in:
/Users/person/Library/Haskell/ghc-7.6.3/lib/exceptions-0.6.1/libexec
Data files installed in:
/Users/person/Library/Haskell/ghc-7.6.3/lib/exceptions-0.6.1/share
Documentation installed in:
/Users/person/Library/Haskell/ghc-7.6.3/lib/exceptions-0.6.1/doc
Using alex version 3.0.5 found on system at: /usr/bin/alex
Using ar found on system at: /usr/bin/ar
No c2hs found
Using cpphs version 1.18.1 found on system at:
/Users/person/Library/Haskell/bin/cpphs
No ffihugs found
Using gcc version 4.2.1 found on system at: /usr/bin/gcc
Using ghc version 7.6.3 found on system at: /usr/bin/ghc
Using ghc-pkg version 7.6.3 found on system at: /usr/bin/ghc-pkg
No greencard found
Using haddock version 2.13.2 found on system at: /usr/bin/haddock
Using happy version 1.18.10 found on system at: /usr/bin/happy
No hmake found
Using hpc version 0.6 found on system at: /usr/bin/hpc
Using hsc2hs version 0.67 found on system at: /usr/bin/hsc2hs
Using hscolour version 1.20 found on system at:
/Users/person/Library/Haskell/bin/HsColour
No hugs found
No jhc found
Using ld found on system at: /usr/bin/ld
No lhc found
No lhc-pkg found
No nhc98 found
No pkg-config found
Using ranlib found on system at: /usr/bin/ranlib
Using strip found on system at: /usr/bin/strip
Using tar found on system at: /usr/bin/tar
No uhc found
creating dist/build
creating dist/build/autogen
Building exceptions-0.6.1...
Preprocessing library exceptions-0.6.1...
Building library...
creating dist/build
/usr/bin/ghc --make -fbuilding-cabal-package -O -odir dist/build -hidir dist/build -stubdir dist/build -i -idist/build -isrc -idist/build/autogen -Idist/build/autogen -Idist/build -optP-include -optPdist/build/autogen/cabal_macros.h -package-name exceptions-0.6.1 -hide-all-packages -package-db dist/package.conf.inplace -package-id base-4.6.0.1-6c351d70a24d3e96f315cba68f3acf57 -package-id mtl-2.1.2-94c72af955e94b8d7b2f359dadd0cb62 -package-id transformers-0.3.0.0-ff2bb6ac67241ebb987351a3db564af0 -XHaskell98 Control.Monad.Catch Control.Monad.Catch.Pure -Wall -fwarn-tabs -O2
<command line>: cannot satisfy -package-id mtl-2.1.2-94c72af955e94b8d7b2f359dadd0cb62
(use -v for more information)
Failed to install exceptions-0.6.1
World file is already up to date.
cabal: Error: some packages failed to install:
exceptions-0.6.1 failed during the building phase. The exception was:
ExitFailure 1
$
Hope that helps. I don't know what to make of it. :-/
--- JPMoresmau ------
Neither do I! It seems cabal finds a mtl package to use, but when it passes the exact reference of the package (with a trailing hash to indicate the specifics of your install), ghc doesn't find it. At least it's nothing to do with EclipseFP, which is a relief (for me :-p). I suggest you post that to the Haskell-Cafe mailing list if nobody has any clue here. I know that MacOS is a bit weird sometimes with PATH and such.
==============================================================================
Thus with the history of this error now told (TL;DR: read JPMoresmau's last comment above), the question I pose to this mailing list is:
Why is ghc failing to find mtl?
Thanks,
~Haskell Beginner