Hi there in version 0.6.4 this runs perfectly: cfi = “/tcenas/home/anderson/lib/eocfi/lib/LINUX64/xxx/xx/libcfi.so” v = ccall((:xl_verbose,cfi),Void,()) but in version 1.0 the lines: cfi = “/tcenas/home/anderson/lib/eocfi/lib/LINUX64/xxx/xx/libcfi.so” v = ccall((:xl_verbose,cfi),CVoid,()) pro…

I’m pretty sure that’s just a path that’s baked in while Julia binaries are being compiled by the official buildbots.

OK, I will create a simple library that I can make available and see if the problem reoccurs (but I suspect that the problem is independent of the library because if I deliberately give the wrong path name to the library then I get the same error message). I will do this next week and in the meantim…

I tried but have no problem. Here is my MWE: /tmp/solib$ cat a.cpp #include <fstream> extern "C" { void fnc(){ std::ofstream f("/tmp/out"); f << "hello" << std::endl; f.close(); } } Building library: /tmp/solib$ g++ -shared -fPIC a.cpp -o a.so I had to restart Julia after changes in…

If you get this even with an invalid library name, then it’s probably a Julia bug. I noticed that you’re running Julia 1.0.0, which has had numerous segfault issues addressed in more recent versions. Any chance you could upgrade to 1.0.1 and retry?

This might be the line that segfaults, but is it the only ccall in your code? Did you perhaps pass some Julia data structure to your library in an earlier call? It could be the case that you’ve passed some Julia object to C, that object was no longer referenced on the Julia side and was therefore ga…

Hi jpsamaroo and nalimilan C code: #include <stdio.h> int test( ) { printf(“testy\n”); return 999; } compiled with: gcc -shared -fPIC test.c -o libtest.so julia code: lib = “/tcenas/home/anderson/julia/xxx/libtest.so” v = ccall((:test,lib),Int32,()) println(v) Runs perfectly with 0.6.4 …

Works here on 1.0.1 (after replacing the lib argument with the literal path).

Well I installed 1.0.1 and retried and the example still segfaults with the same error message as before. This is disappointing. But interestingly the example code provided by Liso (thanks Liso!) seems to run ok (but did not print anything to stdout). As soon as I get time I will play around a bit…

Can you post the exact Julia code you used? As I noted I had to do this instead, since ccall needs a literal string: v = ccall((:test, "/tcenas/home/anderson/julia/xxx/libtest.so"), Cint, ())

Hi nalimilan The file test.c contains: #include <stdio.h> int test( ) { printf(“testy\n”); return 999; } and is compiled with gcc -shared -fPIC test.c -o libtest.so and the julia file m.jl contains: function test() lib = “/tcenas/home/anderson/julia/xxx/libtest.so” v = ccall((:test,lib…

problem with ccall in v1.0

New to Julia

kristoffer.carlsson October 10, 2018, 6:10pm 17

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problem with ccall in v1.0

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