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

Fri Mar 18 20:53:21 UTC 2016

This was really dumb.

My MinGW was just a 32 bit installation, but the stack is version 
1.0.4.2 x86_64, so (I guess) the default arch of the project is x86_64.

The extra-lib-dirs & extra-libraries were ok, but trhu the filters of 
stack I could not see that ld ignored the incompatible libraries. So it 
looked (even with --verbose) like the libraries were not found, when in 
fact they were just incompatible.

Now at least this is clarified.

Sorry for the noise.

Nicu

Am 18.03.2016 um 00:05 schrieb Nicu Ionita:
> What I don't understand is why the stack message sounds:
>
> 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.
>
> Why would be an include directory necessary, if I only miss the 
> library? I understand that the includes are needed to compile the 
> (generated) C sources, but why needed to link? Or is maybe just a typo 
> in the stack message?
>
> Nicu
>
> Am 17.03.2016 um 23:50 schrieb 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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>>>
>>>
>>
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