AF_INET6 and cygwin builds

[Eric Blake]

I'm trying to bootstrap gcj on i686-pc-cygwin, from CVS HEAD, but I am 
running into an error:

/home/eblake/gcc-trunk/gcc/xgcc -shared-libgcc -B/home/eblake/gcc-trunk/gcc/ 
-nostdinc++ -L/home/eblake/gcc-trunk/i686-pc-cygwin/libstdc++-v3/src 
-L/home/eblake/gcc-trunk/i686-pc-cygwin/libstdc++-v3/src/.libs 
-B/home/eblake/gcc-3.4/i686-pc-cygwin/bin/ 
-B/home/eblake/gcc-3.4/i686-pc-cygwin/lib/ -isystem 
/home/eblake/gcc-3.4/i686-pc-cygwin/include -isystem 
/home/eblake/gcc-3.4/i686-pc-cygwin/sys-include -DHAVE_CONFIG_H -I. 
-I../../../gcc/libjava -I./include -I./gcj -I../../../gcc/libjava -Iinclude 
-I../../../gcc/libjava/include -I../../../gcc/libjava/../boehm-gc/include 
-DGC_WIN32_THREADS=1 -DSILENT=1 -DNO_SIGNALS=1 -DNO_EXECUTE_PERMISSION=1 
-DALL_INTERIOR_POINTERS=1 -DJAVA_FINALIZATION=1 -DGC_GCJ_SUPPORT=1 
-DATOMIC_UNCOLLECTABLE=1 -I../../../gcc/libjava/libltdl 
-I../../../gcc/libjava/libltdl -I../../../gcc/libjava/.././libjava/../gcc 
-I../../../gcc/libjava/../zlib -I../../../gcc/libjava/../libffi/include 
-I../libffi/include -fno-rtti -fnon-call-exceptions -fdollars-in-identifiers 
-Wswitch-enum -D__NO_MATH_INLINES -ffloat-store -W -Wall -D_GNU_SOURCE 
-DPREFIX=\"/home/eblake/gcc-3.4\" -DLIBDIR=\"/home/eblake/gcc-3.4/lib\" -g 
-O2 -MD -MT java/net/natInetAddress.lo -MF java/net/natInetAddress.pp -c 
java/net/natInetAddress.cc -o java/net/natInetAddress.o
java/net/natInetAddress.cc: In static member function `static jint
    java::net::InetAddress::getFamily(JArray<jbyte>*)':
java/net/natInetAddress.cc:101: error: `AF_INET6' undeclared (first use this
    function)
java/net/natInetAddress.cc:101: error: (Each undeclared identifier is reported
    only once for each function it appears in.)
java/net/natInetAddress.cc: In static member function `static
    JArray<java::net::InetAddress*>*
    java::net::InetAddress::lookup(java::lang::String*, java::net::InetAddress*,

    __java_boolean)':
java/net/natInetAddress.cc:190: error: `AF_INET6' undeclared (first use this
    function)

On investigation, I found java/net/natInetAddress.cc is linking to 
libjava/java/net/natInetAddressPosix.cc, which has #include <sys/socket.h>. 
  However, the cygwin sys/socket.h does not (yet) support AF_INET6.  Also, 
Michael Koch's Changelog for this file,

2003-03-18  Michael Koch  <konqueror@gmx.de>

	* configure.in: Create links to architecture dependent files,
	introduced PLATFORMNET variable (set to NoNet for newlib usage).
	* configure: Regenerated.
	* java/net/natInetAddressNoNet.cc,
	java/net/natInetAddressPosix.cc,
	java/net/natInetAddressWin32.cc,
	java/net/natNetworkInterfaceNoNet.cc,
	java/net/natNetworkInterfacePosix.cc,
	java/net/natNetworkInterfaceWin32.cc,
	java/net/natPlainDatagramSocketImplNoNet.cc,
	java/net/natPlainDatagramSocketImplPosix.cc,
	java/net/natPlainDatagramSocketImplWin32.cc,
	java/net/natPlainSocketImplNoNet.cc,
	java/net/natPlainSocketImplPosix.cc,
	java/net/natPlainSocketImplWin32.cc: New files.

makes it sound like the link may have been set up correctly - should cygwin 
should be using the NoNet version?  Otherwise, if cygwin is correctly using 
the Posix version, we probably need some configure magic to check for AF_INET6.

-- 
Someday, I might put a cute statement here.

Eric Blake             ebb9@byu.net