GCC 4.0.1 -fvisibility=hidden option does nothing

[Brian Foster]

Sorry... I *just* noticed I had the -w option in there. I took that
out and it gave me the following warning:

warning: visibility attribute not supported in this configuration; ignored

So that partly answers my question. What I'm not sure of is if this
support requires some specific gcc build options, or if this box is
just too old or something...

Thanks,
Brian

On 8/22/05, Brian Foster <bsfost@gmail.com> wrote:
> Hi,
> 
> I've just compiled and installed a copy of GCC 4.0.1 on a RedHat
> machine which also has GCC 2.95 installed (the OS itself is really
> old, I believe it's RedHat 2.1), and I'm having a problem with the
> -fvisibility feature.
> 
> The following is the output from a test build:
> 
> g++ -fvisibility=hidden -w -fpermissive -fPIC -ggdb -c ExceptionTestLib2.cpp
> 
> Using built-in specs.
> Target: i686-pc-linux-gnu
> Configured with: ../configure --prefix=/usr/local/gcc-4.0.1
> Thread model: posix
> gcc version 4.0.1
>  /usr/local/gcc-4.0.1/libexec/gcc/i686-pc-linux-gnu/4.0.1/cc1plus
> -quiet -v -D_GNU_SOURCE ExceptionTestLib2.cpp -quiet -dumpbase
> ExceptionTestLib2.cpp -mtune=pentiumpro -auxbase ExceptionTestLib2
> -ggdb -w -version -fvisibility=hidden -fpermissive -fPIC -o
> /tmp/cc5XMCCh.s
> ignoring nonexistent directory
> "/usr/local/gcc-4.0.1/lib/gcc/i686-pc-linux-gnu/4.0.1/../../../../i686-pc-linux-gnu/include"
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/local/gcc-4.0.1/lib/gcc/i686-pc-linux-gnu/4.0.1/../../../../include/c++/4.0.1
>  /usr/local/gcc-4.0.1/lib/gcc/i686-pc-linux-gnu/4.0.1/../../../../include/c++/4.0.1/i686-pc-linux-gnu
>  /usr/local/gcc-4.0.1/lib/gcc/i686-pc-linux-gnu/4.0.1/../../../../include/c++/4.0.1/backward
>  /usr/local/include
>  /usr/local/gcc-4.0.1/include
>  /usr/local/gcc-4.0.1/lib/gcc/i686-pc-linux-gnu/4.0.1/include
>  /usr/include
> End of search list.
> GNU C++ version 4.0.1 (i686-pc-linux-gnu)
>         compiled by GNU C version 4.0.1.
> GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64098
>  as --traditional-format -V -Qy -o ExceptionTestLib2.o /tmp/cc5XMCCh.s
> GNU assembler version 2.16 (i686-pc-linux-gnu) using BFD version 2.16
> 
> ... so I know it's using the correct version. But an objdump -x of the
> resulting object file shows that none of the symbols are marked
> hidden. I've been going back and forth between this box and another
> more recent box with 3.4.3 installed, and the same compile command
> works fine.
> 
> I also ran 'cc1plus' and 'as' directly (as shown by the g++ -v command
> on each) box to see what the problem was, and all I saw was that the
> cc1plus associated with this 4.0.1 installation does not inject the
> '.hidden' keywords for the symbols in the resulting .s file. I'm not
> sure if this is an issue with my actual GCC configuration/build, or if
> there's a separate outside issue with my environment, any help is
> greatly appreciated...
> 
> Regards,
> Brian F.
>