Re: [Libunwind-devel] build error on Linux x86

[Dave Watson]

On 03/13/17 05:10 PM, Mario Emmenlauer wrote:
> >> This is the error I get:
> >> [...]
> >> In file included from ./elf32.h:7:0,
> >>                  from ../include/tdep-x86/libunwind_i.h:35,
> >>                  from ../include/tdep/libunwind_i.h:23,
> >>                  from ../include/libunwind_i.h:344,
> >>                  from elfxx.h:33,
> >>                  from elf64.h:7,
> >>                  from elf64.c:2:
> >> ./elfxx.h:70:1: note: previous definition of 'elf_map_image' was here
> >>  elf_map_image (struct elf_image *ei, const char *path)
> >>  ^
> > 
> > It looks like it is pulling in both tdep-x86/libunwind_i.h *and*
> > tdep-x86_64/libunwind_i.h (and hence both elf32.h and elf64.h), but
> > it's not clear to me why. Possible include path issue?  Are
> > libunwind-devel headers already installed on your ubuntu machine?
> 
> Thanks for the quick reply! libunwind and -devel are not installed,
> but I do override some environment variables, in case that might be
> related? I set:
>     export CFLAGS="-U_FORTIFY_SOURCE ${CFLAGS}"
> because this helped to build on some flavours of Linux, and I set:
>     export PATH="$THIRDPARTYTARGETDIR/bin:${PATH}"
>     export CFLAGS="-I$THIRDPARTYTARGETDIR/include ${CFLAGS}"
>     export CPPFLAGS="-I$THIRDPARTYTARGETDIR/include ${CPPFLAGS}"
>     export LDFLAGS="-L$THIRDPARTYTARGETDIR/lib ${LDFLAGS}"
>     export LD_LIBRARY_PATH="$THIRDPARTYTARGETDIR/lib:${LD_LIBRARY_PATH}"
> because my installations go into THIRDPARTYTARGETDIR. There should
> not be any x86_64 libs in THIRDPARTYTARGETDIR since I build on a
> dedicated i386 docker image. Could the environment variables some-
> how confuse configure, or is the -U_FORTIFY_SOURCE maybe the root
> of the problem?
> 
> Here is my call to configure:
>     ./configure \
>         --prefix="$THIRDPARTYTARGETDIR/unwind" \
>         --with-pic \
>         --disable-static \
>         --enable-shared
> 

I tried with those exact flags and configure call, and it worked for
me, although I'm on 64bit ubuntu.