Fix znc-buildmod when linking with "ld --as-needed" #125

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2026-10-05T04:00:17+02:00

adam commented

2026-10-05 04:00:17 +02:00

Some distros (like Ubuntu since 11.10) use "ld --as-needed" by default which causes gcc (spawned by znc-buildmod) to ignore ${LIBS}. A simple fix is to move ${LIBS} after the name of the file to be compiled.

${CXX} ${CXXFLAGS} ${INCLUDES} ${LDFLAGS} ${MODLINK} -o "${MOD}.so" "${FILE}" ${LIBS}

Be careful about the order of the parameters when using gcc; the -l option is a linker option, and thus needs to be placed AFTER the name of the file to be compiled. This is quite different from the normal option syntax. If you place the -l option before the filename, it may fail to link at all, and you can end up with mysterious errors.

http://tldp.org/HOWTO/Program-Library-HOWTO/static-libraries.html
http://stackoverflow.com/questions/7824439/c-math-linker-problems-on-ubuntu-11-10

Some distros (like Ubuntu since 11.10) use "ld --as-needed" by default which causes gcc (spawned by znc-buildmod) to ignore ${LIBS}. A simple fix is to move ${LIBS} after the name of the file to be compiled. ``` bash ${CXX} ${CXXFLAGS} ${INCLUDES} ${LDFLAGS} ${MODLINK} -o "${MOD}.so" "${FILE}" ${LIBS} ``` > Be careful about the order of the parameters when using gcc; the -l option is a linker option, and thus needs to be placed AFTER the name of the file to be compiled. This is quite different from the normal option syntax. If you place the -l option before the filename, it may fail to link at all, and you can end up with mysterious errors. http://tldp.org/HOWTO/Program-Library-HOWTO/static-libraries.html http://stackoverflow.com/questions/7824439/c-math-linker-problems-on-ubuntu-11-10

adam closed this issue

2026-10-05 04:00:17 +02:00

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Reference: adam/znc#125