A problem debugging libraries

Tommi Höynälänmaa
2017-03-17T13:35:29Z

I'm writing software using libraries liboctave, LAPACK, and BLAS.
I added function dnrm2alt1 to blas and changed lapack to use that
instead of dnrm2. When I try to debug a program using blas "break
dnrm2_" works in gdb but "break dnrm2alt1_" does not. Gdb can't find
function dnrm2alt1_. Can anybody tell what is wrong?

Here are outputs of some commands:

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tohoyn@tohoyn-laptop:~/tyo/omat/aallokkeet/libinterp3d1$
update-alternatives --config libblas.so.3
There are 2 choices for the alternative libblas.so.3 (providing
/usr/lib/libblas.so.3).

Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/atlas-base/atlas/libblas.so.3 35 auto mode
1 /usr/lib/atlas-base/atlas/libblas.so.3 35
manual mode
* 2 /usr/lib/libblas/libblas.so.3 10 manual
mode

Press enter to keep the current choice[*], or type selection number:
tohoyn@tohoyn-laptop:~/tyo/omat/aallokkeet/libinterp3d1$
---cut here---
---cut here---
tohoyn@tohoyn-laptop:~/tyo/omat/aallokkeet/libinterp3d1$
update-alternatives --config liblapack.so.3
There are 2 choices for the alternative liblapack.so.3 (providing
/usr/lib/liblapack.so.3).

Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/lapack/liblapack.so.3 10 auto
mode
1 /usr/lib/atlas-base/atlas/liblapack.so.3 5
manual mode
2 /usr/lib/lapack/liblapack.so.3 10
manual mode

Press enter to keep the current choice[*], or type selection number:
tohoyn@tohoyn-laptop:~/tyo/omat/aallokkeet/libinterp3d1$
---cut here---
---cut here---
tohoyn@tohoyn-laptop:/usr/lib/libblas$ objdump -T libblas.so.3.0 | grep
-i dnrm2
0000000000040320 g DF .text 0000000000000011 Base dnrm2sub_
000000000000fd50 g DF .text 000000000000002b Base cblas_dnrm2
0000000000040220 g DF .text 000000000000006b Base dnrm2_
0000000000040290 g DF .text 0000000000000084 Base dnrm2alt1_
tohoyn@tohoyn-laptop:/usr/lib/libblas$
---cut here---
---cut here---
tohoyn@tohoyn-laptop:/usr/lib/lapack$ objdump -T liblapack.so.3.0 | grep
-i dnrm2
0000000000000000 DF *UND* 0000000000000000 dnrm2alt1_
tohoyn@tohoyn-laptop:/usr/lib/lapack$
---cut here---

- Tommi H.