RE: "undefined reference" error message when using mkoctfile to create oct file

[Yan Zhang]

I tried adding the "-L" flag but still didn't get through. Here is what I got:

-------------------------------------------------------
>> mkoctfile PowerMeter.cc -L -l usbdll.lib
usbdll.lib: error adding symbols: File format not recognized
collect2.exe: error: ld returned 1 exit status
warning: mkoctfile exited with failure status
warning: called from
    mkoctfile at line 171 column 5
-------------------------------------------------------

I guess the "lib" file I created using Visual Studio 2015 is not recognized by 
mkoctfile.

Thanks,

Yan Zhang | Sr. Product Characterization Engineer | OmniVision Technologies, 
Inc. | 4275 Burton Drive | Santa Clara, CA 95054
t: 408.567.4723 | email: address@hidden | web: www.ovt.com

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-----Original Message-----
From: Tatsuro MATSUOKA [mailto:address@hidden 
Sent: Sunday, February 19, 2017 3:42 PM
To: Yan Zhang; address@hidden
Subject: Re: "undefined reference" error message when using mkoctfile to create 
oct file

----- Original Message -----

> From: Yan Zhang
> To: "help-octave> Cc:
> Date: 2017/2/19, Sun 07:40
> Subject: RE: "undefined reference" error message when using mkoctfile 
> to create oct file
> 
>T hank you for the help. I tried different formats of the mkoctfile 
>command and  here are the messages I got (please note that a file 
>"NewpDll.lib" is  in the same folder as PowerMeter.cc):
> 
>>>  mkoctfile ("PowerMeter.cc", "-l NewpDll.lib")
> c:/users/yan/downloads/octave-4.0.0_0/octave-4.0.0/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe:
>  
> cannot find -l Ne
> wpDll.lib
> collect2.exe: error: ld returned 1 exit status
> warning: mkoctfile exited with failure status
> warning: called from
>     mkoctfile at line 171 column 5
> 
>>>  mkoctfile PowerMeter.cc -lNewpDll
> c:/users/yan/downloads/octave-4.0.0_0/octave-4.0.0/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe:
>  
> cannot find -lNew
> pDll
> collect2.exe: error: ld returned 1 exit status
> warning: mkoctfile exited with failure status
> warning: called from
>     mkoctfile at line 171 column 5
> 
>>>  mkoctfile PowerMeter.cc -l NewpDll
> mkoctfile: unrecognized argument NewpDll
> warning: mkoctfile exited with failure status
> warning: called from
>     mkoctfile at line 171 column 5
> Thanks,
> 
> Yan
> 
> -----Original Message-----
> From: address@hidden [mailto:address@hidden
> Sent: Friday, February 17, 2017 6:55 PM
> To: Yan Zhang; Marco Atzeri; address@hidden
> Subject: RE: "undefined reference" error message when using mkoctfile 
> to create oct file
> 
> octave for windows is built by GCC.
> 
> Your linker option is perhaps wrong.
> 
> -l NewpDll.lib might be modified to
> 
> -lNewpDll
> 
> Tatsuro



Is the below helpful for you?

http://www.mingw.org/wiki/specify_the_libraries_for_the_linker_to_use


If your libraries are located current directory, you have to specify it by 
"-L." (. means current directory)  before library flag -l(libname).

Tatsuro