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Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. Linked 1. Related The topic is quite old, yet I struggled with the same issue today while compiling cegui 0. That'll pass the linker flags from make through to the linker.
Doesn't matter that the makefile was autogenerated. A good description of why the placement of -l dl matters. Try to rebuild openssl if you are linking with it with flag no-threads.
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Collectives on Stack Overflow. Learn more. Asked 12 years, 5 months ago. Active 11 months ago. Viewed k times. Eclipse shows me an error: undefined reference to 'dlopen' Do you know a solution? Improve this question. Sildoreth 1, 23 23 silver badges 38 38 bronze badges. Add a comment. Active Oldest Votes. You have to link against libdl, add -ldl to your linker options. The mode parameter governs when these relocations take place and may have the following values:. To determine the scope of visibility for the symbols loaded with a dlopen invocation, the mode parameter should be a bitwise-inclusive OR with one of the following values:.
If a file is specified in multiple dlopen invocations, mode is interpreted at each invocation. Symbols introduced into a program through calls to dlopen may be used in relocation activities. Symbols so introduced may duplicate symbols already defined by the program or previous dlopen operations.
To resolve the ambiguities such a situation might present, the resolution of a symbol reference to symbol definition is based on a symbol resolution order. Two such resolution orders are defined: load or dependency ordering.
Load order establishes an ordering among symbol definitions, such that the definition first loaded including definitions from the image file and any dependent objects loaded with it has priority over objects added later via dlopen.
Load ordering is used in relocation processing. This means that a self-contained object will use its own symbols in preference to global symbols with the same name contained in objects that have already been loaded. If the executable was linked with the flag "-rdynamic" or, synonymously, "--export-dynamic" , then the global symbols in the executable will also be used to resolve references in a dynamically loaded shared object. If the same shared object is loaded again with dlopen , the same object handle is returned.
The dynamic linker maintains reference counts for object handles, so a dynamically loaded shared object is not deallocated until dlclose has been called on it as many times as dlopen has succeeded on it.
Any initialization returns see below are called just once. If dlopen fails for any reason, it returns NULL.
The dlmopen function differs from dlopen primarily in that it accepts an additional argument, lmid , that specifies the link-map list also referred to as a namespace in which the shared object should be loaded. By comparison, dlopen adds the dynamically loaded shared object to the same namespace as the shared object from which the dlopen call is made.
The object must have been correctly linked to reference all of the other shared objects that it requires, since the new namespace is initially empty.
If the reference count drops to zero, then the object is unloaded. All shared objects that were automatically loaded when dlopen was invoked on the object referred to by handle are recursively closed in the same manner. A successful return from dlclose does not guarantee that the symbols associated with handle are removed from the caller's address space.
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