Error: undefined reference to ndbm functions

[Vaibhav Gupta]

On Fri, Jun 28, 2019, 6:19 PM Joel Sherrill <joel at rtems.org> wrote:

>
>
> On Fri, Jun 28, 2019, 8:40 AM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
> wrote:
>
>>
>>
>> On Fri, Jun 28, 2019, 5:57 PM Joel Sherrill <joel at rtems.org> wrote:
>>
>>> You need to add the library to the gcc command that links the program.
>>> If the libndbm is in the library search path, add -lndbm.
>>>
>>> I don't recall the exact Makefile variable to set for this to show up.
>>> Look at the paranoia sample. It should be doing this with -lm.
>>>
>>> --joel
>>>
>> Okay, I will try this!
>>
>
> The following web page is a pretty good description of building a library
> using a native GCC and linking it into a program. It includes some of the
> theory going on so this might help you.
>
> https://www.cs.swarthmore.edu/~newhall/unixhelp/howto_C_libraries.html
>
> Guys.. this comes up periodically, even though this is really basic tool
> usage to me, is this something we should provide some guidance on?
>
Actually, i tried this before, but I cannot find libndbm in my development
directory. I guess it is not generated.
.
One thing I can do is, the newlib-cygwin i compiled while porting ndbm, it
generated ndbm library. I can use that.

>
> --joel
>
>>
>>> On Fri, Jun 28, 2019, 8:12 AM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
>>> wrote:
>>>
>>>> Hello,
>>>> .
>>>> Status:
>>>>
>>>>    1. I have ported ndbm in newlib. When compiled newlib-cygwin,
>>>>    function symbols were generated. Created patch.
>>>>    2. Applied the patch to RSB and rebuild toolchain. Generated ndbm.h
>>>>    in 5/sparc-rtems5/include directory.
>>>>
>>>> Blocker:
>>>>
>>>>    1. I made a raw program which calls dbm_open, dbm_close, dbm_store,
>>>>    dbm_fetch.
>>>>    2. When  I run 'make -j 2', in erc32 directory, it shows undefined
>>>>    reference to those functions.
>>>>
>>>> https://github.com/VARoDeK/rtems/compare/test_ndbm_presence_02
>>>> .
>>>> home/varodek/development/rtems/5/lib/gcc/sparc-rtems5/7.4.1/../../../../sparc-rtems5/bin/ld:
>>>> psxinttypes01/psxinttypes01-init.o: in function `Init':
>>>> /home/varodek/development/rtems/kernel/rtems/c/src/../../testsuites/psxtests/psxinttypes01/init.c:231:
>>>> undefined reference to `dbm_open'
>>>> /home/varodek/development/rtems/5/lib/gcc/sparc-rtems5/7.4.1/../../../../sparc-rtems5/bin/ld:
>>>> /home/varodek/development/rtems/kernel/rtems/c/src/../../testsuites/psxtests/psxinttypes01/init.c:232:
>>>> undefined reference to `dbm_store'
>>>> /home/varodek/development/rtems/5/lib/gcc/sparc-rtems5/7.4.1/../../../../sparc-rtems5/bin/ld:
>>>> /home/varodek/development/rtems/kernel/rtems/c/src/../../testsuites/psxtests/psxinttypes01/init.c:236:
>>>> undefined reference to `dbm_fetch'
>>>> /home/varodek/development/rtems/5/lib/gcc/sparc-rtems5/7.4.1/../../../../sparc-rtems5/bin/ld:
>>>> /home/varodek/development/rtems/kernel/rtems/c/src/../../testsuites/psxtests/psxinttypes01/init.c:239:
>>>> undefined reference to `dbm_close'
>>>> collect2: error: ld returned 1 exit status
>>>> make[5]: *** [Makefile:7679: psxinttypes01.exe] Error 1
>>>> make[5]: Leaving directory
>>>> '/home/varodek/development/rtems/kernel/erc32/sparc-rtems5/c/erc32/testsuites/psxtests'
>>>> make[4]: *** [Makefile:663: psxtests] Error 2
>>>> make[4]: *** Waiting for unfinished jobs....
>>>> .
>>>> .
>>>> .
>>>> Maybe I have compiled it incorrectly, please verify.
>>>>
>>>>    1. ndbm port: https://github.com/VARoDeK/newlib/compare/port_ndbm
>>>>    2. RSB patch:
>>>>    https://github.com/VARoDeK/rsb/compare/newlib_ndbm_rsb_patch_01
>>>>
>>>> Vaibhav Gupta
>>>>
>>>
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