Can't pass extra cabal parameters for readline on Mac OS X

[edyu]

My project needs readline, so I added a line under build-depends. However, on Mac OS X, readline needs the Gnu c readline to be installed and if I use homebrew to install it, cabal install would need the following extra flags: --extra-include-dirs=/usr/local/opt/readline/include --extra-lib-dirs=/usr/local/opt/readline/lib readline --configure-option=--with-readline-includes=/usr/local/opt/readline/include --configure-option=--with-readline-libraries=/usr/local/opt/readline/lib
How do I pass to Stack those extra flags in order to build readline for my project?

I get the following error if I don't supply those flags:
Linking /private/var/folders/pf/fjqk_sm161dc2_hnvqr99q280000gn/T/stack95780/readline-1.0.3.0/.stack-work/dist/x86_64-osx/Cabal-1.22.5.0/setup/setup ...
Warning: defaultUserHooks in Setup script is deprecated.
Configuring readline-1.0.3.0...
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for GNUreadline.framework... checking for readline... no
checking for tputs in -lncurses... yes
checking for readline in -lreadline... yes
checking for rl_readline_version... yes
checking for rl_begin_undo_group... no
configure: error: readline not found, so this package cannot be built
See `config.log' for more details.

[mgsloan]

Are these config options sufficient? http://docs.haskellstack.org/en/stable/yaml_configuration/#extra-include-dirsextra-lib-dirs

[edyu]

No,they are not. They are meant to be used when compiling my own package not for being part of the cabal dependencies in build-depends.

[edyu]

Some new hooks may need to be exposed in order for build dependencies to be customized.

[mgsloan]

These options go in your stack build configuration.

[edyu]

I have them in my stack build configuration. They are not enough. Also
there is a bug in parsing the cabal file for extra-include-dirs in that
it's not recognized.

Even if I add them to the yaml file directly, I'm still missing a way to
pass in --configure-option.
On Jun 6, 2016 2:21 PM, "Michael Sloan" notifications@github.com wrote:

These options go in your stack build configuration.

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[mgsloan]

Yeah, that's tracked by #1438 which I've bumped to P1

[aymanosman]

@edyu See this stackoverflow answer.

Say your are on OSX

$ brew install readline
[...]
For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/readline/lib
    CPPFLAGS: -I/usr/local/opt/readline/include

Now you know where the library got installed you can set some environmental variables that ./configure will pick up

LDFLAGS=-L/usr/local/opt/readline/lib \
CFLAGS=-I/usr/local/opt/readline/include \
stack install readline --extra-include-dirs=/usr/local/opt/readline/include --extra-lib-dirs=/usr/local/opt/readline/lib

[edyu]

@aymanosman that actually works! thank you.
Back on this issue: I still don't think it was properly fixed as technically those should be specified somehow in a config file instead of specifying in the command line.

[brendanzab]

So I've put the following in my ~/.stack/config.yaml:

extra-include-dirs:
- /usr/local/opt/readline/include
extra-lib-dirs:
- /usr/local/opt/readline/lib

Alas readline still won't build. Do I need to put the environment variables somewhere? If so, how do I scope that to the build of readline specifically without going via the command line?