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Anyone know the recommended way to do interop with C and Nimrod? I've been doing Project Euler problems in Nimrod, and wanted to use some library functions fro

Anyone know the recommended way to do interop with C and Nimrod? I've been doing Project Euler problems in Nimrod, and wanted to use some library functions from GSL for bignum support, but I couldn't really get c2nim to work with the header files. I think that I could use the 'importc'/'dynlib' with the compiled library, but there's not a whole lot of documentation on that in the Nimrod manual, and I ended up just doing that problem in C because it was easier (read: I was lazier) to get working.

def- 12y ago
For general C/Nimrod interop see these Rosetta Code tasks: http://rosettacode.org/wiki/Call_a_foreign-language_function#Nimrod http://rosettacode.org/wiki/Call_a_foreign-language_function... http://rosettacode.org/wiki/Call_a_function_in_a_shared_library#Nimrod http://rosettacode.org/wiki/Call_a_function_in_a_shared_libr... http://rosettacode.org/wiki/Use_another_language_to_call_a_function#Nimrod http://rosettacode.org/wiki/Use_another_language_to_call_a_f... Making c2nim work with header files can be a bit difficult. The main information is here: http://nimrod-lang.org/c2nim.html http://nimrod-lang.org/c2nim.html When something throws an error I comment it out and try to see if I can fix it up by hand.
ilaksh 12y ago
I never tried the c2nim thing but just used a few compiler directives I think to call C code. It was incredibly easy.
perturbation 12y ago
To the curious - I got this working (thank you def- for the rosetta code examples!). Point of correction - the library I was actually using for bignum support was GMP, not GSL. (I was getting confused because I used functions from GSL for a different problem). Importing a standard procedure from a C library like GMP actually is pretty easy (use the importc/header pragmas). Here's what tripped me up: * Calling variadic functions from Nimrod (just wrote a wrapper) * Getting to link against gmp (used the passL: "-lgmp" pragma) * Remembering to free what was allocated by C library functions (can't GC what you didn't allocate) - caught with valgrind I'll probably push to my github repo, but can post to a pastebin or something if there's interest in a less cookie-cutter example

def- 12y ago

For general C/Nimrod interop see these Rosetta Code tasks: http://rosettacode.org/wiki/Call_a_foreign-language_function#Nimrod http://rosettacode.org/wiki/Call_a_foreign-language_function... http://rosettacode.org/wiki/Call_a_function_in_a_shared_library#Nimrod http://rosettacode.org/wiki/Call_a_function_in_a_shared_libr... http://rosettacode.org/wiki/Use_another_language_to_call_a_function#Nimrod http://rosettacode.org/wiki/Use_another_language_to_call_a_f... Making c2nim work with header files can be a bit difficult. The main information is here: http://nimrod-lang.org/c2nim.html http://nimrod-lang.org/c2nim.html When something throws an error I comment it out and try to see if I can fix it up by hand.

ilaksh 12y ago

I never tried the c2nim thing but just used a few compiler directives I think to call C code. It was incredibly easy.

perturbation 12y ago

To the curious - I got this working (thank you def- for the rosetta code examples!). Point of correction - the library I was actually using for bignum support was GMP, not GSL. (I was getting confused because I used functions from GSL for a different problem). Importing a standard procedure from a C library like GMP actually is pretty easy (use the importc/header pragmas). Here's what tripped me up: * Calling variadic functions from Nimrod (just wrote a wrapper) * Getting to link against gmp (used the passL: "-lgmp" pragma) * Remembering to free what was allocated by C library functions (can't GC what you didn't allocate) - caught with valgrind I'll probably push to my github repo, but can post to a pastebin or something if there's interest in a less cookie-cutter example