On Oct 3 14:03, Dave Korn wrote: > Corinna Vinschen wrote: > > > I just built a gcc 4.3.4 Linux->Cygwin cross compiler using the sources > > from the Cygwin 1.7 distro. I used the following build flags: > > > > --disable-bootstrap --enable-version-specific-runtime-libs \ > > --enable-static --enable-shared --enable-shared-libgcc \ > > --disable-__cxa_atexit --with-gnu-ld --with-gnu-as --with-dwarf2 \ > > --disable-sjlj-exceptions --enable-languages=c,c++ --disable-symvers \ > > --enable-threads=posix --with-arch=i686 --with-tune=generic \ > > --with-newlib > ^^^^^^^^^^^^^^ > > Are you doing something tricky w.r.t. the headers and libs you supply to the > build process? You appear to be using none-at-all out of --with-headers, > --with-includes and --with-sysroot.
Nothing special. I need the --with-newlib, otherwise the libstdc++ build fails with configure:<lineno>: error: No support for this host/target combination. We talked about this in PM already, back in January. Btw., I also had to set --disable-__cxa_atexit in contrast to your --enable-__cxa_atexit. If I don't do that, I get undefined reference errors (some dso_foo and cxa_foo functions) when building libstdc++. > > When I try to build Cygwin I get: > > > > cc1plus: error: command line option '-muse-libstdc-wrappers' is not > > supported by this configuration > > > > What am I doing wrong? > > Take a look in $objdir/gcc/config.log; what happened during the "checking > for __wrap__Znaj" test? Hmmmmm, I may have the config set up wrong so it only > works in bootstrap, not crossbuilds. You could try manually hacking Apparently. There's no line containing __wrap__Znaj in config.log. > "-DUSE_CYGWIN_LIBSTDCXX_WRAPPERS=1" into the CFLAGS. Meanwhile, I need to go Thanks, I'll try that. > figure out how to make sure and check the target rather than host libraries > for the presence of a function. (It's worth adding fixing this to the to-do > list for -2). While you're at it, there is another problem. When building gcc-4.3.4 as cross, the auto-host.h file contains #ifndef USED_FOR_TARGET /* #undef HAVE_GAS_ALIGNED_COMM */ #endif afterwards. That's quite unlucky, since options.c contains an unconditional int use_pe_aligned_common = HAVE_GAS_ALIGNED_COMM; So, right now I had to define HAVE_GAS_ALIGNED_COMM to 1 manually in auto-host.h. And, while we're at it, how do I switch on the TSAWARE flag by default? Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat
