Error: undefined reference to ndbm functions

[Vaibhav Gupta]

On Mon, Jul 1, 2019 at 6:07 PM Aditya Upadhyay <aadit0402 at gmail.com> wrote:

> On Mon, Jul 1, 2019 at 5:58 PM Joel Sherrill <joel at rtems.org> wrote:
> >
> > If you have finished ndbm, please do not attempt to write memcpy for
> SPARC. It is not as important as having fenv.h methods. We have a default
> memcpy implementation for all architectures. The hope was to find an
> already implemented optimized version with history for the SPARC. But so
> far we haven't found one with appropriate license. It will be difficult to
> implement, ensure correctness, and really gain speed.
> >
> > So work on filling a gap in what APIs are provided. Fenv.h
> >
> > Also we need to work on merging your ndbm work.
> >
> Newlib-Cygwin uses db_local.h and it was ported from FreeBSD. Since
> that, A lot thing has changed.
> If we replace this db_local.h to current freeBSD db.h, then we also
> need to make changes in other file such
> as hash.c.
>
> What is your view on this? Shall we ask this on newlib mailing list?
>
I stepped up for this after the suggestion of gedare. Planned to update
whole of search directory.
I asked this query on newlib, but they haven't replied yet. We can re-send
this query.

>
> > --joel
> >
> > On Mon, Jul 1, 2019, 5:54 AM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
> wrote:
> >>
> >> Hello,
> >> I am reading about memcpy to write it for newlib.
> >> Should I also write wmemcpy along with it?
> https://pubs.opengroup.org/onlinepubs/009695399/functions/wmemcpy.html
> >> .
> >> Regarding ndbm reference. RSB has not generated library files.
> >> - but in newlib source tree, when I compiled newlib, while porting
> ndbm, it generated lib_a-ndbm.o object file.
> >> - I am planning to use that object file to compile ndbm testsuite.
> >> .
> >> When Object file and C file are present in same directory, we can use :
> >> $ gcc trial.c mylib.o
> >> But I am not able to find out, how to use this in Makefile.am.
> >> LDADD replaces all global variables while compiling.
> >>
> >> I tried various codes, but could not solve it. I just want to use the
> object file (lib_a-ndbm.o)
> >> created while building newlib, to compile ndbm testsuite.
> >>
> >> I need guidance for this.
> >>
> >> Vaibhav Gupta
> >>
> >> On Fri, Jun 28, 2019 at 9:57 PM Gedare Bloom <gedare at rtems.org> wrote:
> >>>
> >>> On Fri, Jun 28, 2019 at 7:20 AM Vaibhav Gupta <
> vaibhavgupta40 at gmail.com> wrote:
> >>> >
> >>> >
> >>> >
> >>> > 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.
> >>>
> >>> Yes, the library should be 'bundled' with the updated compiler
> >>> toolchain. You need to be sure you are using this toolchain. Is it
> >>> what you installed to /home/varodek/development/rtems/5 ?
> >>>
> >>> Gedare
>
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