Bruno Haible <bruno <at> clisp.org> writes: > > Hi Simon, > > Like for <sys/socket.h>, <netinet/in.h> should be self-contained according > to POSIX, and the test verifies this. It fails on MacOS X, because it > needs <sys/types.h> to be included first. Here's a proposed change to > create an overridden netinet/in.h also in this case. > > + > + dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make > + dnl the check for those headers unconditional; yet cygwin reports > + dnl that the headers are present but cannot be compiled (since on > + dnl cygwin, all socket information should come from netinet/in.h). > + > + AC_CHECK_HEADERS([netinet/in.h])
_Too much_ copy-n-paste from the sys/socket module. It is true that you cannot do AC_CHECK_HEADERS_ONCE([winsock2.h ws2tcpip.h]) on cygwin, since those are Windows API headers and conflict with POSIX API. But for sys/socket.h and netinet/in.h, there is nothing wrong with AC_CHECK_HEADERS_ONCE. You need to simplify this .m4 down to only what is really needed (since on cygwin, netinet/in.h is self-contained, so the replacement should not need to trigger). -- Eric Blake
