[Bug 1056340] [NEW] gcc option "-lm" fails - cannot link agains libm

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I newly installed LinuxMint13  (Mate 64 Bit) , fully updated
(2012-09-25) , on a new  AMD64 machine.

gcc works properly except when using mathlib functions. Error messages
always indicate that sqrt() and other mathlib functions are unresolved.
I checked the installation and found:

 - /usr/lib/x86_64-linux-gnu/libm.a
 - /usr/lib/x86_64-linux-gnu/libm.so  ( -> /lib/x86_64-linux-gnu/libm.so.6)
 - /lib/x86_64-linux-gnu/libm.so.6  ( -> libm-2.15.so)
 - /lib/x86_64-linux-gnu/libm-2.15.so

Symbol "sqrt" was present (type "W") in both the static and the shared
library.

Both "gcc -lm" and "gcc -L/usr/lib/x86_64-linux-gnu -L/lib/x86_64-linux-gnu -lm" reported persistently:
"undefined reference to sqrt".

Same picture with all other libm functions I tried. The source code contains "#include <math.h>", of course.
What is going wrong?

** Affects: gcc-defaults (Ubuntu)
     Importance: Undecided
         Status: New

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gcc option "-lm" fails - cannot link agains libm
https://bugs.launchpad.net/bugs/1056340
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