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Cannot Load Library Symbol Table

You will not be able to “run” an object file, but you can disassemble functions and inspect variables. You can then look it up using dlsym() exactly like you would for any C function. It looks for the first -lgcc, and replaces it with target independent rules for shared and static libgcc. In that case, gdb can fetch values from these sections out of the object file, rather than from the target program. http://dekovsoft.com/cannot-load/cannot-load-library-undefined-symbol-qt.html

Shared libraries are also supported in many cross or remote debugging configurations. Zack's patch for 4.x doesn't work as-is for 3.4.x because the multilib logic has changed in mklibgcc.in. To demonstrate: simple executable and dynamically loaded library. #include #include void exported_callback() /*< Function we want to export */ { printf("Hello from callback!\n"); } viud unexported_callback() /*< Function we Expanding FULLY a macro as argument How to give Permission to create sandbox? https://community.hpe.com/t5/Languages-and-Scripting/Cannot-load-library-symbol-table/td-p/4242059

Find out what the mangled name of the function is, and use that in your dlsym() call. Footnotes[1] Historically the functionality to retrieve binaries from the remote system was provided by prefixing path with remote: www.delorie.com/gnu/docs/gdb/gdb_125.html search Buy the book! PATH is searched when necessary. They have %{shared-libgcc ... %{static-libgcc ...}} which can't possibly be right.

Browse other questions tagged c linux gcc shared-libraries or ask your own question. A little further explanation is that once compiled, your dynamic library will have an undefined symbol in it for the function that is in the main code. Oops. "HP as" -> "HP ar". If you are using a "real" shell, what does whence ranlib or whence ar show?It will likely show the wrong /usr/local/bin/ version?So you should make sure that /usr/bin comes before /usr/local/bin/.

I do not have an ia64-hpux machine, so I can not easily investigate this. By using this site, you accept the Terms of Use and Rules of Participation. End of content United StatesHewlett Packard Enterprise International CorporateCorporateAccessibilityCareersContact UsCorporate ResponsibilityEventsHewlett Packard LabsInvestor RelationsLeadershipNewsroomSitemapPartnersPartnersFind a PartnerPartner In addition to the section information displayed by info files, this command displays the flags and file offset of each section in the executable and core dump files. https://community.hpe.com/t5/Languages-and-Scripting/Having-trouble-with-archive-libraries-on-HP-UX-Machine/td-p/5264907 Honored Contributor [Founder] Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Highlight Print Email to a Friend Report Inappropriate Content ‎03-13-2006 10:42 AM ‎03-13-2006 10:42 AM Re: Having trouble

For dynamic linking I am using the following command on command prompt. I haven't checked that. symbol-file [ filename ] Read symbol table information from file filename. The command help target lists all possible targets rather than current ones.

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed http://stackoverflow.com/questions/480617/receive-undefined-symbol-error-when-loading-libary-with-dlopen The regression testing > with Zack's patch seemed to go fine and hand testing some cases looks OK too. I guess 'struct eh_dummy;' didn't add enough symbolic information to > the archive library. add-symbol-file filename address add-symbol-file filename address [ -readnow ] [ -mapped ] add-symbol-file filename -ssection address ... The add-symbol-file command reads additional symbol table information from the file filename.

Skipping library > /proj/opensrc/sje/test2/gcc-ia64-hp-hpux11.2 > 3-std/lib/gcc/ia64-hp-hpux11.23/3.4.5/libgcc_eh.a. > > because libgcc_eh.a is empty. Check This Out gdb automatically loads symbol definitions from shared libraries when you use the run command, or when you examine a core file. (Before you issue the run command, gdb does not understand The second part may not be safe without other changes. 2005-02-19 Zack Weinberg * mklibgcc.in: If libgcc_eh.a would be empty, put a dummy object inside. * config/ia64/hpux.h: Don't define LIBGCC_SPEC. RELOC Section needs to be relocated before loading.

more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Instead, it scans the symbol table quickly to find which source files and which symbols are present. show basenames-may-differShow whether a source file may have multiple base names. Source GDB searches the environment variable PATH if necessary to locate your program.

You can additionally specify an arbitrary number of `-ssection address' pairs, to give an explicit section name and base address for that section. I can't find one but it > seems like this might have happened, that in 3.4 (with C) -shared does not > imply -shared-libgcc but in 4.0 it does. If you do not specify a directory and the file is not found in the gdb working directory, gdb uses the environment variable PATH as a list of directories to search,

The dynamic symbol table is the set of symbols which are visible from dynamic objects at run time.

The reason is that, it also solves the same problem if you a) your program (or a trird-party module) is linked (not in runtime) against the shared library, which symbols need The purpose of this two-stage reading strategy is to make GDB start up faster. Go to Solution. Thanks in advance.

Try debugging init_specs where it calls init_gcc_specs. When the symbol table is stored in COFF format, symbol-file reads the symbol table data in full right away. You can additionally specify an arbitrary number of ‘-s section address’ pairs, to give an explicit section name and base address for that section. have a peek here filefile with no argument makes gdb discard any information it has on both executable file and the symbol table.

file filename Use filename as the program to be debugged. It is less useful than setting a catchpoint, because it does not allow for conditions or commands as a catchpoint does.