bfin c++ problem

Waldemar Brodkorb wbx@openadk.org
Thu Jul 21 16:47:00 GMT 2016


Hi Oliver,
Oliver Kullmann wrote,

> On Thu, Jul 21, 2016 at 12:40:43PM +0100, Jonathan Wakely wrote:
> > On 21 July 2016 at 12:12, Oliver Kullmann wrote:
> > > On Thu, Jul 21, 2016 at 11:26:42AM +0100, Jonathan Wakely wrote:
> > >> On 21 July 2016 at 04:05, Oliver Kullmann wrote:
> > >> > Hello,
> > >> >
> > >> > a C++ compiler is not required to recognise "main(void)":
> > >>
> > >> That's incorrect.

Thanks for any advice about correct usage of C++, but I am afraid
it does not help in any way to fix my original problem.
Please open up a new thread to discuss this. Thanks.

Anyway, even a simple C application does compile with gcc, but not
with g++:

./output/host/usr/bin/bfin-buildroot-linux-uclibc-g++ -o t test.c
/home/wbx/buildroot/output/host/usr/lib/gcc/bfin-buildroot-linux-uclibc/6.1.0/../../../../bfin-buildroot-linux-uclibc/bin/ld:
t: hidden symbol `___gtdf2' in
/home/wbx/buildroot/output/host/usr/lib/gcc/bfin-buildroot-linux-uclibc/6.1.0/libgcc.a(_gt_df.o)
is referenced by DSO
/home/wbx/buildroot/output/host/usr/lib/gcc/bfin-buildroot-linux-uclibc/6.1.0/../../../../bfin-buildroot-linux-uclibc/bin/ld:
final link failed: Bad value
collect2: error: ld returned 1 exit status
$ cat test.c
int main() {
 return(0);
}

$ ./output/host/usr/bin/bfin-buildroot-linux-uclibc-gcc -o t test.c
$ file t
t: ELF 32-bit LSB executable, Analog Devices Blackfin, version 1
(SYSV), dynamically linked (uses shared libs), not stripped
$ 

Any advice? Why does the hidden symbols in libgcc.a from the
first-stage gcc, doesn't make it into libstdc++ shared library?

Buildroot first compiles gcc with --disable-shared and have then a
libgcc.a. Afterwards the C library (uClibc-ng) is build. In the next
step a full --enable-shared gcc including libstdc++ is build.
This one is then somehow mislinked and then g++ can not compile 
a simple application.

It must be some architecture specific problem, because we are not
seeing this kind of issues on any other architecture at the moment.

Thanks in advance
 Waldemar



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