Re: [Blocxx-devel] build-errors when building after ./configure --enable-ipv6

[Kevin H. <bar...@gm...>]

2011/11/4 Björn Esser <bjo...@go...>:
> When I was trying to build BloCxx with support for IPv6 on several linux
> distris (CentOS 6, Fedora 15, Debian Squeeze, Ubuntu 10.04 LTS through
> 11.11, (Open)SuSE 11) from trunk and BRANCH_2.2.0 there where problems
> during compilation when "--disable-Werror" is not applied in the
> ./configure-command.
>
> The errors/warnings occur like shown here:
>
> ...snip...
> if g++ -DHAVE_CONFIG_H -I. -I. -I../.. -I../../src -I../../src
> -D_LARGE_FILES=      -fno-enforce-eh-specs -fPIC -D_REENTRANT -D_GNU_SOURCE
> -pipe -Wall -W -Woverloaded-virtual -Wno-unused -Wno-unused-label
> -Wno-unused-parameter -Wno-long-long -Wwrite-strings -Wextra -Wabi -DNDEBUG
> -O3 -MT ServerSocketImpl.o -MD -MP -MF ".deps/ServerSocketImpl.Tpo" -c -o
> ServerSocketImpl.o ServerSocketImpl.cpp; \
>     then mv -f ".deps/ServerSocketImpl.Tpo" ".deps/ServerSocketImpl.Po";
> else rm -f ".deps/ServerSocketImpl.Tpo"; exit 1; fi
> ServerSocketImpl.cpp: In member function »void
> blocxx8::ServerSocketImpl::doListenIPv4(blocxx8::UInt16, int, const
> blocxx8::String&)«:
> ServerSocketImpl.cpp:516: Warnung: dereferencing pointer »inetAddr.130« does
> break strict-aliasing rules

> When compiling after ./configure --disable-ipv6 theese errors/warnings do
> not appear.

I cannot duplicate this on my various ubuntu installs, 32 or 64 bit.
Not even when forcefully injecting -fstrict-alias.

I did do a little search for your problem, and made a potential
workaround.  Could you apply the attached patch to a checkout of trunk
and see if it fixes your compilation issues?
Note that the patch compiles on my machines, with and without ipv6,
but has not been thoroughly tested.