Re: svn commit: r1662329 - /subversion/trunk/configure.ac

Philip Martin <philip.martin_at_wandisco.com> writes:

> Branko Čibej <brane_at_wandisco.com> writes:
>
>> Alternatively, we could just stop supporting broken 1.x libtool.
>
> Building from tarballs would be unaffected if we bumped the libtool
> requirement. Only people running autogen.sh would need the newer
> libtool. Libtool 1.5 dates from 2003.
>
> The current code is bit like magic, it dates back to r850874 and fixes
> issue 2031. While we have two C++ libraries, libsvnjavahl and
> libsvn_auth_kwallet, the extra library is only used for LINK_JAVAHL_CXX
> not LINK_CXX_LIB. I think that means nobody builds kwallet with libtool
> 1.4 possibly because such old systems do not have KDE or are server-only
> for Subversion.

This whole bit of code has too much magic. FreeBSD 10 uses clang and
from the command line this works:

  c++ x.o -o x -lstdc++

because clang converts -lstdc++ to -lc++. However when libtool invokes
c++ to link it also passes -nostdlib and this fails:

  c++ x.o -o x -nostdlib -lstdc++
  /usr/bin/ld: cannot find -lstdc++

because the conversion doesn't happen.

So to write a runtime check using something like AC_CHECK_LIBS or
AC_LINK_IFELSE the check has to use libtool or use the same flags as
libtool. I'm not going to try and write that.

-- 
Philip Martin | Subversion Committer
WANdisco // *Non-Stop Data*