Re: AIX 5.3 GCC 4.2.1 libstdc++ Linker Problems

[Andrew Haley <aph-gcc at littlepinkcloud dot COM>]

ericbambach1@discover.com writes:
 > Thanks for responding.
 > 
 > Andrew Haley <aph-gcc@littlepinkcloud.COM> wrote on 09/11/2007 04:53:09 
 > AM:
 > 
 > > ericbambach1@discover.com writes:
 > >  > Hello,
 > >  > 
 > >  >         Please CC as I'm not subscribed. Hope line breaks are ok, I 
 > hate 
 > >  > Lotus Notes :)
 > >  > 
 > >  >         I'm having a lot of trouble getting gcc 4.2.1 compiled and 
 > run on 
 > >  > AIX 5.3 on the power5 architecture. Even after GCC compiles 
 > successfully 
 > >  > it seems libstdc++.a isn't built correctly.
 > >  > 
 > >  >         We have the IBM binary gcc-4.0.0 compiler installed in 
 > >  > /opt/freeware/bin so I know its possible to get GCC on here somehow.
 > >  > 
 > >  >         It builds fine but compilation of this simple test program 
 > fails 
 > >  > with g++. gcc SEEMS to function ok but I havent checked it in depth 
 > yet. 
 > >  > Take a look at the session below (edited for readability + mask 
 > >  > user+hostname only) where it first fails to find libgcc_s even though 
 > the 
 > >  > configure script placed it in /sys/usr/lib just like I asked, Next it 
 > cant 
 > >  > link against libstdc++.a. Once I turn on the verbose output I see 
 > that 
 > >  > libstdc++.a has no symbols being imported! I dont know much about 
 > >  > compilers but it seems that I need SOME symbols from libstdc++ are 
 > needed. 
 > >  > Last, if I force it to link against IBM's libstdc++.a it works fine. 
 > >  > 
 > >  >         Am I building gcc wrong? I did build it with GNU make and the 
 > AIX 
 > >  > as+ld. I borrowed IBM's config flags from 4.0.0. Any additional info 
 > >  > needed?
 > > 
 > > This is a clue:
 > > 
 > > Configured with: ../gcc-4.2.1/configure --with-as=/usr/bin/as 
 > > --with-ld=/usr/bin/ld --disable-nls --enable-languages=c,c++ 
 > > --prefix=/sys/usr/local --bindir=/sys/usr --enable-threads 
 > > --enable-version-specific-runtime-libs --host=powerpc-ibm-aix5.3.0.0 : 
 > > (reconfigured) ../gcc-4.2.1/configure --with-as=/usr/bin/as 
 > > --with-ld=/usr/bin/ld --disable-nls --enable-languages=c,c++ 
 > > --prefix=/sys/usr/local --with-slibdir=/sys/usr/lib --enable-threads 
 > > --enable-version-specific-runtime-libs --host=powerpc-ibm-aix5.3.0.0
 > > 
 > > So, you configured and built gcc without specifying the dir for the
 > > shared libgcclibrary, and you then reconfigured with one.  Why did you
 > > do this?
 > 
 > At first I was just testing the build. Then I reconfigured to put the 
 > libraries int the location we need them for the server. I figure that may 
 > be why it can't find libgcc_s initially, but I'm not too worried about 
 > that. I'm more worried that it can't find symbols in libstdc++.

Well no, you didn't.  You put libgcc in one place and the rest of the
libraries in another.  This is a Bad Thing.  You should only use
--with-slibdir in very special circumstances -- otherwise you should
just put everything in the prefix.

 > >  >  __gxx_personality_v0      [6]     ER PR hello.c(/tmp//cc05Pxwk.o)
 > >  >                                    00000111 .data    R_POS    [24] 
 > >  > _GLOBAL__F_main_8A711DF0
 > >  > ER: The return code is 8.
 > >  > ld: 0711-317 ERROR: Undefined symbol: __gxx_personality_v0
 > >  > collect2: ld returned 8 exit status
 > > 
 > > OK, so __gxx_personality_v0 is missing.  It should be in
 > > /sys/usr/local/lib/libstdc++.  Is it?

 > Yea. I know nothing about nm, but as far as I can see its defined in the 
 > library. The output differs slightly when I compare the IBM build and my 
 > build but I dont know enough about these numbers to know if it makes a 
 > difference.

I don't know either.  I don't think I can help any more -- you need an
AIX linker expert.

Andrew.