Hi,
I’m trying to compile 32-bit Cygwin 2.0.2 from source on a clean installation
of Cygwin, but I’m running into a problem – it won’t compile due to this error:
c++wrap -O2 -g -fno-rtti -fno-exceptions -fno-use-cxa-atexit -Wall
-Wstrict-aliasing -Wwrite-strings -fno-common -pipe -fbuiltin
-fmessage-length=0 -MMD -Werror -fmerge-constants -ftracer -c -o net.o
../../../../newlib-cygwin/winsup/cygwin/net.cc
../../../../newlib-cygwin/winsup/cygwin/net.cc: In function ‘unsigned int
if_nametoindex(const char*)’:
../../../../newlib-cygwin/winsup/cygwin/net.cc:2448:33: error: conflicting
declaration of C function ‘unsigned int if_nametoindex(const char*)’
if_nametoindex (const char *name)
^
In file included from /usr/include/w32api/iphlpapi.h:170:0,
from ../../../../newlib-cygwin/winsup/cygwin/net.cc:34:
/usr/include/w32api/netioapi.h:374:29: note: previous declaration
‘NET_IFINDEX if_nametoindex(PCSTR)’
NET_IFINDEX NETIOAPI_API_ if_nametoindex (PCSTR InterfaceName);
^
../../../../newlib-cygwin/winsup/cygwin/net.cc: In function ‘char*
if_indextoname(unsigned int, char*)’:
../../../../newlib-cygwin/winsup/cygwin/net.cc:2481:47: error: conflicting
declaration of C function ‘char* if_indextoname(unsigned int, char*)’
if_indextoname (unsigned ifindex, char *ifname)
^
In file included from /usr/include/w32api/iphlpapi.h:170:0,
from ../../../../newlib-cygwin/winsup/cygwin/net.cc:34:
/usr/include/w32api/netioapi.h:375:23: note: previous declaration ‘CHAR*
if_indextoname(NET_IFINDEX, PCHAR)’
PCHAR NETIOAPI_API_ if_indextoname (NET_IFINDEX InterfaceIndex, PCHAR
InterfaceName);
^
../../../../newlib-cygwin/winsup/cygwin/../Makefile.common:43: recipe for
target 'net.o' failed
Examining the source for net.cc, I note the following comments at the top:
/* FIXME: Collision with different declarations of if_nametoindex and
if_indextoname functions in iphlpapi.h since Vista.
TODO: Convert if_nametoindex to cygwin_if_nametoindex and call
system functions on Vista and later. */
Huh? Further examination shows that there is indeed a conflict. But I
examined the commit history in net.cc and it looks like nobody has changed
anything related to this for years in that file. The comment itself is quite
old. I'm a little amazed it's been working before. What am I missing here to
get Cygwin building?
One other minor quibble/note: I had to install texinfo package to get the build
going; this isn't currently noted in the FAQ as a requirement.
Best regards,
James Johnston
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