Error: undefined reference to ndbm functions

[Vaibhav Gupta]

On Mon, Jul 1, 2019 at 6:18 PM Aditya Upadhyay <aadit0402 at gmail.com> wrote:

> On Mon, Jul 1, 2019 at 6:10 PM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
> wrote:
> >
> >
> >
> > 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.
>
> Yeah. You can resend that mail.  Did you find any porting source for
> fenv methods?
>
Just now started looking.

> If not, Then you can take a look here:
> https://github.com/freebsd/freebsd/blob/master/lib/msun/arm/fenv.c

Thanks :D !!

>
>
> >>
> >>
> >> > --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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