Re: EH bug in Makefile.in

[Robert Lipe <robertl at dgii dot com>]

> > I believe that the problem on linux is that you need a recent gas snapshot;
> > 2.8.1 fills a .align in .eh_frame with NOPs instead of zeroes.
> > 
> 
> No. The bug is in gcc/Makefile.in. egcs-971023 turns off exceptions
> in C. But _eh.o in libgcc2.a has to be compiled with exceptions
> on. I added -fexceptions to LIBGCC2_CFLAGS in gcc/Makefile.in.


That seemed to pretty fix it for OpenServer.   Though I haven't 
tamed runtest yet, the following script (which crashed gloriously
withouth this fix) pretty much works now for both COFF (sjlj) and
ELF (dwarf2).   eh/*.C is copied straight from 
../*23/gcc/testsuite/g++*/*/*eh*.

for i in eh/*.C
do
        for f in -melf -mcoff
        do
                grep -i "don't link" $i > /dev/null && continue
                ./negcs $i && ./a.out || echo $f $i failed.
        done
done
(robertl) rjlhome:/play/testgcc
$ sh *.sh
Undefined                       first referenced
 symbol                             in file
endl(ostream &)                     /usr/tmp/cca004i31.o
ostream::operator<<(ostream &(*)(ostream &))/usr/tmp/cca004i31.o
ostream::operator<<(int)            /usr/tmp/cca004i31.o
cout                                /usr/tmp/cca004i31.o
ostream::operator<<(char const *)   /usr/tmp/cca004i31.o
a.out: fatal error: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status
-melf eh/eh2.C failed.
Undefined                       first referenced
 symbol                             in file
endl(ostream &)                     /usr/tmp/cca004iA1.o
ostream::operator<<(ostream &(*)(ostream &))/usr/tmp/cca004iA1.o
ostream::operator<<(int)            /usr/tmp/cca004iA1.o
cout                                /usr/tmp/cca004iA1.o
ostream::operator<<(char const *)   /usr/tmp/cca004iA1.o
a.out: fatal error: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status
-mcoff eh/eh2.C failed.
eh/eh54.C: In function `int main()':
eh/eh54.C:3: parse error before `}'
eh/eh54.C:3: warning: didn't find handler for EH region 3
eh/eh54.C:3: warning: region exists, no handler 3
eh/eh54.C:3: warning: region exists, no handler 3
eh/eh54.C:3: warning: region exists, no handler 3
eh/eh54.C:3: warning: region exists, no handler 3
-melf eh/eh54.C failed.
eh/eh54.C: In function `int main()':
eh/eh54.C:3: parse error before `}'
eh/eh54.C:3: warning: didn't find handler for EH region 3
eh/eh54.C:3: warning: region exists, no handler 3
eh/eh54.C:3: warning: region exists, no handler 3
eh/eh54.C:3: warning: region exists, no handler 3
eh/eh54.C:3: warning: region exists, no handler 3
-mcoff eh/eh54.C failed.
Unwind works!
Unwind works!