[Haskell-cafe] Trying desperately to make a c library binding on Windows - solved!
nicu.ionita at acons.at
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
18.104.22.168 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.
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?
> 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:
>> Library is under:
>> 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 22.214.171.124 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
>>> 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-126.96.36.199-x86_64-windows-ghc-7.10.3.exe: Missing
>>> 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 (
>>> p\Optimisation\Stochastic\BayesOpt.o )
>>> ghc.exe: unable to load package `BaseOh-0.1.0.0'
>>> \HSBaseOh-0.1.0.0-GdNObdePATgDIW1I2OVwEc.o: unknown symbol
>>> -- 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.
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