dash/build-aux/m4/l_socket.m4
fanquake 2966452a1b
Merge #21486: build: link against -lsocket if required for *ifaddrs
4783115fd4cccb46a7f8c592b34fa7c094c29410 net: add ifaddrs.h include (fanquake)
879215e665a9f348c8d3fa92701c34065bc86a69 build: check if -lsocket is required with *ifaddrs (fanquake)
87deac66aa747481e6f34fc80599e1e490de3ea0 rand: only try and use freeifaddrs if available (fanquake)

Pull request description:

  Fixes #21485 by linking against `-lsocket` when it's required for using `*ifaddrs` functions.

ACKs for top commit:
  laanwj:
    Code review ACK 4783115fd4cccb46a7f8c592b34fa7c094c29410
  hebasto:
    ACK 4783115fd4cccb46a7f8c592b34fa7c094c29410, I have reviewed the code and it looks OK, I agree it can be merged.

Tree-SHA512: 4542e036e9b029de970eff8a9230fe45d9204bb22313d075f474295d49bdaf1f1cbb36c0c6e2fa8dbbcdba518d8d3a68a6116ce304b82414315f333baf9af0e4
2022-09-03 10:43:15 -05:00

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# Illumos/SmartOS requires linking with -lsocket if
# using getifaddrs & freeifaddrs
m4_define([_CHECK_SOCKET_testbody], [[
#include <sys/types.h>
#include <ifaddrs.h>
int main() {
struct ifaddrs *ifaddr;
getifaddrs(&ifaddr);
freeifaddrs(ifaddr);
}
]])
AC_DEFUN([CHECK_SOCKET], [
AC_LANG_PUSH(C++)
AC_MSG_CHECKING([whether ifaddrs funcs can be used without link library])
AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_SOCKET_testbody])],[
AC_MSG_RESULT([yes])
],[
AC_MSG_RESULT([no])
LIBS="$LIBS -lsocket"
AC_MSG_CHECKING([whether getifaddrs needs -lsocket])
AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_SOCKET_testbody])],[
AC_MSG_RESULT([yes])
],[
AC_MSG_RESULT([no])
AC_MSG_FAILURE([cannot figure out how to use getifaddrs])
])
])
AC_LANG_POP
])