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capr

"undefined reference" even the lib has a symbol of the function

When i linked the .o files,some problems happened:

gcc -L/usr/local/apr/lib -lapr-1 -pthread -laprutil-1  devpkg.o bstrlib.o db.o shell.o commands.o   -o devpkg
devpkg.o: In function `main':
/root/workspace/devpkg/devpkg.c:21: undefined reference to `apr_pool_initialize'
/root/workspace/devpkg/devpkg.c:22: undefined reference to `apr_pool_create_ex'
/root/workspace/devpkg/devpkg.c:36: undefined reference to `apr_getopt_init'
/root/workspace/devpkg/devpkg.c:38: undefined reference to `apr_getopt'

I used "objdump -T" to check the lib,it returned:

objdump -T libapr-1.so|grep apr_pool_initialize
000000000001db00 g    DF .text  00000000000000fb  Base        apr_pool_initialize

Why did this happen?

Solution

  • This is most likely just a simple dependency issue. You might want to try listing all the libraries you link to after the .o files, in the right order based on their dependencies with one another.