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20050423: McIDAS - linker error with mcidas 2004 (cont.)

>From: Jake Wimberley <address@hidden>
>Organization: Mississippi State University
>Keywords: 200504230114.j3N1E5tp014199 McIDAS Debian libsdi.a

Hi Jake,

>Thank you for your prompt attention to my problem.

No worries.

>I initially tried 
>deleting and recreating libsdi.a with make, like you suggested.  
>However, this did not completely populate the library with the object 
>files you listed.  (I think it stopped after swap2.o.)  So I tried your 
>second suggestion, to add them by hand.  I verified that the files were 
>in the library with the nm command, and it showed the full list of 
>object files.  I then tried 'make mcx VENDOR=-g77' and it immediately 
>restarted with 'decoder' but gave the same error it did before, and 
>exited (output in the makelog looks identical to what it did before).  I 
>noticed it said
>
>decoder.o(.text+0x17b3): In function `end_of_line':
>: undefined reference to `wnvblk_'
>
>so I ran the command:
>
>nm libsdi.a | grep wnvblk_
>
>and it returned:
>
>U wnvblk_

I just checked libsdi.a built on one of our Fedora Core 3 Linux systems
and see that all that is there is a reference to wnvblk_.  Closer
inspections shows that wnvblk_ is supposed to be included in
libmcidas.a, not libsdi.a.  This tells me that your libmcidas.a is not
complete probably for the same reason that libsdi.a wasn't.

Try remaking libmcidas.a:

<as 'mcidas'>

cd ~mcidas/mcidas2004/src
rm libmcidas.a
make libmcidas.a VENDOR=-g77

>According to the manpage for nm, the 'U' means that this symbol is 
>undefined.

That is correct.  What is in libsdi.a is a reference to the wnvblk_
entry point which should be located in libmcidas.a.

>I don't know anything about libraries or the make utility, 
>but is there something wrong with my system, causing this to remain 
>undefined when it should not?

I am suspicious of the clock having been set during the build process
causing one or more object files to not be added to libmcida.a.

>Do I need to somehow restart compiling 
>McIDAS from the beginning?

Removing libmcidas.a and making it should work.  If it doesn't, I would
start from the beginning:

<as 'mcidas'>

cd ~mcidas/mcidas2004/src
make clobber
make mcx VENDOR=-g77

>The version of make I have is the latest available (3.80).  Do you have 
>info on the patch the Slackware user employed to solve this problem?

Unfortunately, no.

>One more thing:  I have an older laptop running RedHat 8.0.  Is it 
>possible to compile all or part of the software on that machine, to 
>avoid all these errors, and then move the compiled files to my Debian 
>system?

I have been working with another site this morning on building the
ldm-mcidas decoders under the latest Debian release since the binaries
built under Fedora Core did not work.  Because of this I would have to
believe that a build under RH 8 would not work/work properly on your
Debian machine.

>Again, thank you for your help... I look forward to using McIDAS when I 
>complete the installation.

Let's hope remaking libmcidas.a does the trick for you.

>Regards

Cheers,

Tom
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