Error: undefined reference to ndbm functions

[Vaibhav Gupta]

On Mon, Jul 1, 2019 at 6:21 PM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
wrote:

>
>
> 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
>
> FreeBSD is not having fenv implementation for SPARC architecture.
I found it in NetBSD
https://github.com/NetBSD/src/blob/trunk/sys/arch/sparc/include/fenv.h
https://github.com/NetBSD/src/blob/trunk/lib/libm/arch/sparc/fenv.c
.
I also got implementation for ARM in NetBSD
https://github.com/NetBSD/src/blob/trunk/sys/arch/arm/include/fenv.h
https://github.com/NetBSD/src/blob/trunk/lib/libm/arch/arm/fenv.c
But FreeBSD is having updated version for ARM.

> 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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