undefined reference to `__errno_location'

[Android2011]

Hello sir,

I am compileing application for ndk, i am getting error "undefined
reference to `__errno_location'".

Any any one please let me know that is missing?



thanks in advance...

[mic _]

Try replacing  __errno_location  with  &errno

You can find errno.h in platforms/android-#/arch-arm/usr/include

/Michael

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[Android2011]

thanks mic,

actually it is errno its not __errno_location in code or c file. but
compilation gives error of "undefined reference to
`__errno_location'", i have searched it in errno.h too but no
succcess.
I am tracing down how it gives error of undefined reference to
`__errno_location' even though its errno. do you know this?


do you know which lib should contain the defination of the
"__errno_location", i have found it in libc.so on some platform. is it
correct?

> >http://groups.google.com/group/android-ndk?hl=en.- Hide quoted text -
>
> - Show quoted text -

[mic _]

This works for me:

volatile int * errnoLoc = &errno;

Are you sure you're not linking against some library or object file(s) that were compiled with some other toolchain and are referencing __errno_location?

/Michael

[Tim Mensch]

On 5/5/2011 5:57 AM, Android2011 wrote:
> actually it is errno its not __errno_location in code or c file. but
> compilation gives error of "undefined reference to
> `__errno_location'", i have searched it in errno.h too but no
> succcess.

You probably have an include file somewhere that #defines errno to
__errno_location. Search your include tree for such a define. Check
every folder you're asking it to include.

Or as Michael suggested, maybe you're linking with something built
against a different tool chain; that just won't work.

Tim

[Chris Stratton]

> actually it is errno its not __errno_location in code or c file. but
> compilation gives error of "undefined reference to
> `__errno_location'", i have searched it in errno.h too but no
> succcess.

Use ndk-build V=1 to see the commands being issued by the build system

Or just use grep -r on directories potentially containing the .o files to figure out which one has a dependency on that symbol.

It does sound like the wrong toolchain / wrong libc class of problem - grepping /usr/lib on my ubuntu box finds lots of occurrences, while grepping /system/lib on my android device finds none, so I suspect you may have something linked against glibc rather than bionic.

[BTR Naidu]

I guess its more of linker issue than pre-processor...

On Tuesday, 3 May 2011 19:10:15 UTC+2, mic wrote:

Try replacing  __errno_location  with  &errno

You can find errno.h in platforms/android-#/arch-arm/usr/include

/Michael

On Mon, May 2, 2011 at 7:32 AM, Android2011 <snjag...@gmail.com> wrote:

Hello sir,

I am compileing application for ndk, i am getting error "undefined
reference to `__errno_location'".

Any any one please let me know that is missing?



thanks in advance...

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[David Turner]

On Mon, May 2, 2011 at 7:32 AM, Android2011 <snjag...@gmail.com> wrote:

Hello sir,

I am compileing application for ndk, i am getting error "undefined
reference to `__errno_location'".

__errno_location is a GLibc-specific symbol, not supported by Android. This means your binary has been generated with the wrong toolchain.

You should really give more details about what you're doing, and how if you want any useful answer on this forum.

 

Any any one please let me know that is missing?



thanks in advance...

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