Re: Urgent Question regarding GCOV

[Ian Lance Taylor <iant at google dot com>]

Jayashree Ramani <rjayashree@yahoo.com> writes:

> Hello GCC Experts,

This message should have been sent to gcc-help@gcc.gnu.org rather than
gcc@gcc.gnu.org.  Please send any followups to gcc-help.

>
>     I am an engineer trying to run gcov for our unit tests. We have a couple of DLLs and a few static libraries.
>
>     I am having trouble linking the Test program that links in the DLLs. I have the following in the Cmake files:
>
> IF( "${COVERAGE}" STREQUAL "TRUE" )
>      LINK_DIRECTORIES(/usr/lib64/gcc-lib/x86_64-suse-linux/3.3.3) 
>      TARGET_LINK_LIBRARIES( NWATest analytics TestUtils ${SYSTEM_LIBS} )
> ENDIF( "${COVERAGE}" STREQUAL "TRUE" )

gcc 3.3.3 is quite old at this point.

> But I get the following errors:
>
> /bin/ld: NWATest: hidden symbol `__gcov_init' in /usr/lib64/gcc-lib/x86_64-suse-linux/3.3.3/libgcc.a(_gcov.oS) is referenced by DSO

The error message means that some shared library is calling __gcov_init,
which is a hidden symbol.  The way to fix this is to make sure that you
pass the --coverage option when you link the shared library.  At least,
that will do the right thing with current gcc; I don't know for sure
that it will work with gcc 3.3.3.

Ian