[cfarm-users] gcc112/ppc64-le, and undefined reference to __cxa_thread_atexit_impl

[David Edelsohn]

On Mon, Feb 19, 2018 at 4:20 PM, Jeffrey Walton via cfarm-users
<cfarm-users at lists.tetaneutral.net> wrote:
> On Mon, Feb 19, 2018 at 4:12 PM, Segher Boessenkool
> <segher at kernel.crashing.org> wrote:
>> Hi,
>>
>> On Mon, Feb 19, 2018 at 02:49:47PM -0500, Jeffrey Walton via cfarm-users wrote:
>>> /opt/cfarm/gcc7rc2/bin/g++ -o cryptest.exe -DNDEBUG -g2 -O3 -fPIC
>>> -pthread -pipe adhoc.o test.o bench1.o bench2.o validat0.o validat1.o
>>> validat2.o validat3.o validat4.o datatest.o regtest1.o regtest2.o
>>> regtest3.o dlltest.o fipsalgt.o ./libcryptopp.a
>>> /home/guerby/opt/cfarm/gcc7rc2/bin/../lib/gcc/powerpc64le-unknown-linux-gnu/7.0.1/../../../../lib64/libstdc++.so:
>>> undefined reference to `__cxa_thread_atexit_impl at GLIBC_2.18'
>>> collect2: error: ld returned 1 exit status
>>> make: *** [cryptest.exe] Error 1
>>
>> How/why do you get anything from /home/guerby?  /opt/cfarm/gcc7rc2 was
>> build on a different machine (and it is only there so people can use it
>> as an easy starting point for building ada: the system compiler on 112
>> does not support that) so there is no way it refers to there.
>
> Hmm, I'm not sure. I'm on GCC112, and it is in /opt/cfarm:
>
> $ ls /opt/cfarm/
> autoconf-latest    ftp         krb5-latest  mpfr-latest     python3-latest
> bison-latest       gcc7rc2     m4-latest    openssl-latest  release
> cyrus-sasl-latest  gcc-latest  make-latest  perl5-latest    zlib-latest
> db-latest          gmp-latest  mpc-latest   python2-latest
>
>> I know nothing about the build system you used, but it seems buggy.
>
> I used a GNUmakefile:
>
>     CXX=/opt/cfarm/gcc7rc2/bin/g++ make -j 20
>
> Nothing special, as far as I know. Just using the latest compiler.

Why are you using /opt/cfarm instead of the default system compiler?

That is special.  /opt/cfarm is not installed as an alternate system
compiler.  It's not even the latest compiler.  If you choose to
override the defaults and refer to a random compiler whose origin you
don't know, you may encounter unintended consequences, as you have
discovered.

Thanks, David