Dlopen Link Error
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Dlopen Error Undefined Symbol Root
Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like dlopen error codes you, helping each other. Join them; it only takes a minute: Sign up Linux c++ error: undefined reference to 'dlopen' up vote 67 down vote favorite 10 I work in Linux with C++ (Eclipse), and want to use undefined reference to dlopen linux a library. Eclipse shows me an error: undefined reference to 'dlopen' Do you know a solution? Here is my code: #include
Undefined Reference To Dlopen Ubuntu
7 '15 at 17:33 Sildoreth 1,2911332 asked Jun 5 '09 at 15:49 user101375 2,06182939 add a comment| 7 Answers 7 active oldest votes up vote 127 down vote accepted You have to link against libdl, add -ldl to your linker options share|improve this answer answered Jun 5 '09 at 16:00 Masci 3,03011517 2 I have run into the same problem... I added the compiler flag under Project>Properties>C/C++Build>Settings>(My Linker)>Miscellaneous in the Linker flags text field. It did nothing. –MirroredFate Feb 2 '13 at 7:09 3 Ha, ok, for anyone else that has this problem, use the above path, except go to Libraries rather than Miscellaneous and add the 'dl' –MirroredFate Feb 2 '13 at 7:53 1 This answer helped. For anyone who wants to find the location of libdl.so, just go to the root directory and type locate libdl.so –Nav Jul 4 '13 at 11:46 MirroredFate's answer worked for me as well. I don't understand why, though; every other library I've ever had to link worked when placed in Miscellaneous. –aggregate1166877 Jul 27 '14 at 22:19 add a comment| up vote 26 down vote @Masci is correct, but in case you're using C (and the gcc compiler) take in account that this doesn't work: gcc -ldl dlopentest.c But this does: gcc dlopentest.c -ldl Took me a bit to figure out... sh
const char *symbol); int dlclose(void *handle); Link with -ldl. Description The four functions dlopen(), dlsym(), dlclose(), dlerror() implement the interface undefined reference to dlopen gcc to the dynamic linking loader. dlerror() The function dlerror() returns undefined reference to dlopen cmake a human readable string describing the most recent error that occurred from dlopen(), dlsym() or dlclose()
Undefined Reference To __dlopen
since the last call to dlerror(). It returns NULL if no errors have occurred since initialization or since it was last called. dlopen() The function http://stackoverflow.com/questions/956640/linux-c-error-undefined-reference-to-dlopen dlopen() loads the dynamic library file named by the null-terminated string filename and returns an opaque "handle" for the dynamic library. If filename is NULL, then the returned handle is for the main program. If filename contains a slash ("/"), then it is interpreted as a (relative or absolute) pathname. Otherwise, the https://linux.die.net/man/3/dlopen dynamic linker searches for the library as follows (see ld.so(8) for further details): o (ELF only) If the executable file for the calling program contains a DT_RPATH tag, and does not contain a DT_RUNPATH tag, then the directories listed in the DT_RPATH tag are searched. o If, at the time that the program was started, the environment variable LD_LIBRARY_PATH was defined to contain a colon-separated list of directories, then these are searched. (As a security measure this variable is ignored for set-user-ID and set-group-ID programs.) o (ELF only) If the executable file for the calling program contains a DT_RUNPATH tag, then the directories listed in that tag are searched. o The cache file /etc/ld.so.cache (maintained by ldconfig(8)) is checked to see whether it contains an entry for filename. o The directories /lib and /usr/lib are searched (in that order). If the library has dependencies on other shared libraries, then these are also automatically loade
NAME top dlclose, dlopen, dlmopen - open and close a shared object SYNOPSIS top #include
Reference to dlopen, dlclose, dlerror, dlsym Reported by: amigoricardo Owned by: ipopt-team Priority: normal Component: Ipopt Version: 3.11 Severity: blocker Keywords: Cc: Description Hi! Compiling IPOPT 3.11.7 under an Ubuntu 13.10, I've got the following: then mv -f ".deps/ampl_ipopt.Tpo" ".deps/ampl_ipopt.Po"; else rm -f ".deps/ampl_ipopt.Tpo"; exit 1; fi /bin/bash ../../../../libtool --tag=CXX --mode=link g++ -O3 -pipe -DNDEBUG -pedantic-errors -Wparentheses -Wreturn-type -Wcast-qual -Wall -Wpointer-arith -Wwrite-strings -Wconversion -Wno-unknown-pragmas -Wno-long-long -DIPOPT_BUILD -o ipopt ampl_ipopt.o libipoptamplinterface.la ../../Interfaces/libipopt.la /home/amigo/CoinIpopt-build/ThirdParty/ASL/libcoinasl.la -lm -ldl -llapack -lblas -lm -ldl g++ -O3 -pipe -DNDEBUG -pedantic-errors -Wparentheses -Wreturn-type -Wcast-qual -Wall -Wpointer-arith -Wwrite-strings -Wconversion -Wno-unknown-pragmas -Wno-long-long -DIPOPT_BUILD -o .libs/ipopt ampl_ipopt.o ./.libs/libipoptamplinterface.so ../../Interfaces/.libs/libipopt.so /home/amigo/CoinIpopt-build/ThirdParty/ASL/.libs/libcoinasl.so -llapack -lblas -lm -ldl -Wl,--rpath -Wl,/home/amigo/CoinIpopt-build/lib ../../Interfaces/.libs/libipopt.so: undefined reference to `dlopen' ../../Interfaces/.libs/libipopt.so: undefined reference to `dlclose' ../../Interfaces/.libs/libipopt.so: undefined reference to `dlerror' ../../Interfaces/.libs/libipopt.so: undefined reference to `dlsym' collect2: error: ld returned 1 exit status make[3]: * [ipopt] Error 1 make[3]: Leaving directory `/home/amigo/CoinIpopt-build/Ipopt/src/Apps/AmplSolver' make[2]: * [all-recursive] Error 1 make[2]: Leaving directory `/home/amigo/CoinIpopt-build/Ipopt/src/Apps' make[1]: * [all-recursive] Error 1 make[1]: Leaving directory `/home/amigo/CoinIpopt-build/Ipopt' make: * [all-recursive] Error 1 How can I fix it? It seems to be related to versioned symbols (http://list.coin-or.org/pipermail/ipopt/2013-November/003569.html). I've edited the Makefile as suggested at the link above but it still doesn't work. Oldest first Newest first Threaded Comments only Change History (3) comment:1 Changed 3 years ago by kelman Same issue as https://projects.coin-or.org/Ipopt/ticket/229, just with libdl here (used by ASL and the linear solver loader) instead of libpthread (used by Mumps but not for anything too important). Either configure with LDFLAGS="-Wl,--no-as-needed" or with --enable-dependency-linking. comment:2 Changed 3 years ago by amigoricardo Worked. Tha