Let’s say you have the following C source file, call it name.c #include <stdio.h> #include <stdlib.h> void print_name(const char * name) { printf(“My name is %s\n”, name); } When you compile it, with cc name.c you generate name.o. The .o contains the compiled code and data for all functions and variables defined in name.c, as … Read more
What are “unused DT entry” errors? If you have reached this page, it’s probably because you have compiled or attempted to run some binaries on your ARM based Android system, with the result that your binary/app crashes or generates a lot of warnings in your logcat. Typically something like this: WARNING: linker: /blahblah/libopenssl.so: unused DT … Read more
See this answer. Is this even the correct approach here No: you can’t use mismatched versions of glibc as your link command does. You used crt0.o and ld-linux.so from new (system-installed) libc, but libc.so.6 from an old (copied from cluster) libc. That is just not going to work.
Actually having actually tried it, I think the link I posted as a comment doesn’t do exactly what you want with dependencies. What you are quite reasonably asking for is a way to have Spark play nicely with setuptools and pip regarding installing dependencies. It blows my mind that this isn’t supported better in Spark. … Read more
When you create a shared object, you give it both a real name and an SONAME (shared object name). These are used to install the shared object (which creates both the object and various links to it). So you can end up with the situation: pax> ls -al xyz* lrwxrwxrwx 1 pax pax 0 Nov … Read more
In the find_package documentation you have that you can set a path to be searched with PATHS you were missing the S… also you can do something like: find_package (<package> PATHS paths… NO_DEFAULT_PATH) find_package (<package>) Which will check for the path you wrote first, the if it is found it will set found to true … Read more
The linker is able to accept filenames too gcc app.o -l:libmy.so.1 -o app From man ld: -l namespec –library=namespec Add the archive or object file specified by namespec to the list of files to link. This option may be used any number of times. If namespec is of the form :filename, ld will search the … Read more
Any idea about what I might be doing wrong? The t function is indeed local to the library. This could happen due to a number or reasons. The most likely ones are: You declared the function static, or You compiled the library with -fvisibility=hidden and did not have __attribute__((visibility(“default”))) on the function, or You linked … Read more
It is possible to create working shared libraries on 64-bit OS X, with the latest Haskell Platform release (2012.4 64bit) The invocation line works for me: ghc -O2 –make \ -no-hs-main -optl ‘-shared’ -optc ‘-DMODULE=Test’ \ -o libTest.so Test.hs module_init.c module_init.c should be something like: #define CAT(a,b) XCAT(a,b) #define XCAT(a,b) a ## b #define STR(a) … Read more
So the solution we have for now is as follows: test.cpp #include <cmath> #include <vector> #include <typeinfo> struct private_struct { float f; }; float private_function(float f) { return std::abs(f); } void other_private_function() { std::vector<private_struct> f(1); } extern “C” void __attribute__ ((visibility (“default”))) public_function2() { other_private_function(); } extern “C” float __attribute__ ((visibility (“default”))) public_function1(float f) { … Read more