[Haskell-cafe] Trying desperately to make a c library binding on Windows

[Nicu Ionita]

Am 17.03.2016 um 23:24 schrieb Theodore Lief Gannon:
> > I am on Win 7, using stack (configured for lts-4.2) under MinGW.
>
> Stack itself provides MSYS2/MinGW during builds on Windows. Do you 
> mean you have an independent MinGW shell that you're opening, and then 
> running stack from there?

Yes, I work under the git bash (git for Windows comes with an own msys).

> If so, assuming you're not already using this flag, try:
>
> stack build --skip-msys

Just tried that now, same result.
>
> This tells stack that it's already running inside a unix-style shell, 
> and shouldn't assert its related path overrides.
>
> Beyond that, it would help to have more information about exactly 
> where everything is and how it's being built/invoked/etc.

Project is under:
J:\Projects\BaseOh

Library is under:
J:\BO\lib

and is called:  libbayesopt.a

(under bash they are called /j/Projects/BaseOh and /j/BO/lib, needless 
to say I tried those too, but they are not found, as the programs know 
only Windows style paths).

So beeing under the git bash in the project directory, I type:
 > stack build

or even:
 > stack build --extra-lib-dirs=j:\\BO\\lib

But in both cases, if the line "extra-libraries: bayesopt" is present in 
the cabal file, then configure does not work (message below).

Inbetween I upgraded stack (now is version 1.0.4.2 x86_64). When I try 
to build, I get the message:

Continuing despite missing tool: msys2

after which the build continues and brings exactly the same failures.

>
> On Thu, Mar 17, 2016 at 2:19 PM, Nicu Ionita <nicu.ionita at acons.at 
> <mailto:nicu.ionita at acons.at>> wrote:
>
>     Hi all,
>
>     I am really stuck with my try to make a Haskell binding for the
>     library bayesopt on Windows.
>     In theory it looks all simple, just put some lines in the cabal
>     configuration file:
>
>     ...
>     extra-lib-dirs:      /path/to/the/lib    -- contains the file
>     libbayesopt.a
>     extra-libraries:    bayesopt
>     ...
>
>     But whatever I tried, I can't step over the configuration phase,
>     coz I get (I'm compiling with stack):
>
>     Configuring BaseOh-0.1.0.0...
>     setup-Simple-Cabal-1.22.5.0-x86_64-windows-ghc-7.10.3.exe: Missing
>     dependency
>     on a foreign library:
>     * Missing C library: /j/BO/lib/libbayesopt.a
>     This problem can usually be solved by installing the system
>     package that
>     provides this library (you may need the "-dev" version). If the
>     library is
>     already installed but in a non-standard location then you can use
>     the flags
>     --extra-include-dirs= and --extra-lib-dirs= to specify where it is.
>
>     If I comment those lines out, then the configure phase succeeds,
>     the library is compiled (i.e. my binding library), but a test
>     executable in the same project does of course not compile, as
>     symbols are missing:
>
>     ...
>     In-place registering BaseOh-0.1.0.0...
>     Preprocessing executable 'test' for BaseOh-0.1.0.0...
>     [1 of 2] Compiling Optimisation.Stochastic.BayesOpt (
>     src\Optimisation\Stochasti
>     c\BayesOpt.hs,
>     .stack-work\dist\x86_64-windows\Cabal-1.22.5.0\build\test\test-tm
>     p\Optimisation\Stochastic\BayesOpt.o )
>     ghc.exe: unable to load package `BaseOh-0.1.0.0'
>     ghc.exe:
>     J:\Projects\BaseOh\.stack-work\dist\x86_64-windows\Cabal-1.22.5.0\build
>     \HSBaseOh-0.1.0.0-GdNObdePATgDIW1I2OVwEc.o: unknown symbol
>     `initialize_parameter
>     s_to_default'
>
>     --  While building package BaseOh-0.1.0.0 using:
>     ...
>
>     Does somebody have some idea, what is going on?
>
>     I am on Win 7, using stack (configured for lts-4.2) under MinGW.
>     (I'm using inline-c to make the bindings, and the same trick for
>     include - include-dirs: ... - worked fine.)
>
>     Thanks, and sorry for the longer email.
>     Nicu
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