shared-libraries

问题 I work with a python swig-wrapped C++ library. In it's __init__.py file, it sets the dlopen flag RTLD_GLOBAL before importing the shared object file containing the implementation code. This causes the subsequent import of scipy.linalg to segfault, at least on my machine. I think this behavior depends on the way in which scipy was built and what it's linked against though. # minimal example of what's going on $ cat test.py import sys import ctypes flags = sys.getdlopenflags() sys

问题 I work with a python swig-wrapped C++ library. In it's __init__.py file, it sets the dlopen flag RTLD_GLOBAL before importing the shared object file containing the implementation code. This causes the subsequent import of scipy.linalg to segfault, at least on my machine. I think this behavior depends on the way in which scipy was built and what it's linked against though. # minimal example of what's going on $ cat test.py import sys import ctypes flags = sys.getdlopenflags() sys

问题 I am using mysql c++ connector with this (a bit simplified) code. try { statement->setString(1, word); statement->executeUpdate(); } catch( sql::SQLException& e ) { // I don't get here return sqlerrno_to_error_code( e.getErrorCode() ); } catch( std::exception& e ) { // I do get here and the cast works sql::SQLException& sqle = (sql::SQLException&) e; return sqlerrno_to_error_code( sqle.getErrorCode() ); } The connector is supposed to throw the sql::SQLException which derives from std:

问题 The code in question has worked in more or less the exact same configuration on earlier releases of Windows, however, it is not known to have run on Windows 7 YET! That's what I need to solve now. Briefly, some C code performs some configuration and security checks before launching a java program, passing some data that would be neigh-into-impossible to do easily in Java. The Java in turn, at the appropriate time launches the same C code which then itself launches a different Java program.

问题 The code in question has worked in more or less the exact same configuration on earlier releases of Windows, however, it is not known to have run on Windows 7 YET! That's what I need to solve now. Briefly, some C code performs some configuration and security checks before launching a java program, passing some data that would be neigh-into-impossible to do easily in Java. The Java in turn, at the appropriate time launches the same C code which then itself launches a different Java program.

问题 Problem On MacOS, I get linking problems at runtime for a CMake project that depends on dynamically linked resources – but only after installing the project! The problem does not occur when I only build the binary without installing it. $ ./testapp Hello world! $ $INSTALLDIR/testapp dyld: Library not loaded: @rpath/libvtkDomainsChemistryOpenGL2-7.1.1.dylib Referenced from: /Users/normanius/workspace/installdir/testapp Reason: image not found [1] 76964 trace trap /Users/normanius/workspace

问题 I am building a shared library in C that is dynamically loaded by a program that I do not have source access to. The target platform is a 64-bit Linux platform and we're using gcc to build. I was able to build a reproduction of the issue in ~100 lines, but it's still a bit to read. Hopefully it's illustrative. The core issue is I have two non-static functions ( bar and baz ) defined in my shared library. Both need to be non-static as we expect the caller to be able to dlsym them. Additionally

问题 Is there any way to call the functions which are in a so library from my Java code? Generally, is it possible to use Linux so libraries in Java programs? 回答1: The answer is "JNI" :) Here are a couple of links: How to compile dynamic library for a JNI application on linux? http://learn-from-the-guru.blogspot.com/2007/12/java-native-interface-jni-tutorial-hell.html http://docs.oracle.com/javase/6/docs/technotes/guides/jni/ 回答2: Another wayto access libraries form java besides JNI is JNA. I find

问题 Most of the time, when you compile a shared library, executing it is meaningless and doing so produces nothing useful: $ ./libfoobarbaz.so Segmentation fault However, the folks at GNU have been able to stick in some output when glibc is executed: $ /lib/libc.so.6 GNU C Library (Debian EGLIBC 2.11.2-10) stable release version 2.11.2, by Roland McGrath et al. Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not

问题 I compiled and installed LLVM from trunk on debian wheezy some weeks ago (configure & make) and now tried to out of source compile the llvm-mutate pass. AFAICC, llvm-mutate follows the cmake out of source pass build instructions. When trying to build llvm-mutate mkdir build cd build cmake -DCMAKE_MODULE_PATH=/usr/local/share/llvm/cmake ../ I get: -- Mutate ignored -- Loadable modules not supported on this platform. hmm? opt and the loadable passes (at llvm_trunk/build/Debug+Asserts/lib/xxx.so