Bruno Haible <[EMAIL PROTECTED]> writes:
> Simon Josefsson wrote:
>> My problem is getting
>> AC_SEARCH_LIBS to find functions in the mingw32 libraries. It seems a
>> __stdcall is required in the prototype to make it link correctly.
>
> The prototype with __stdcall must be contained in a public include file,
> no? (<winsock2.h>, included by your <sys/socket.h> substitute.)
Right.
> It seems you will have to write a test that
> 1) tries to use gethostbyname() with the #include and no additional
> libraries,
> 2) same thing with -lwsock32,
> and set some LIB* or *_LDFLAGS variable, depending on the result.
> Look how AM_ICONV_LINK (in gethostbyname.m4) does it; something like
> this:
Yes, I agree, and I have tested something similar. The following
works:
AC_SEARCH_LIBS(gethostbyname, [inet nsl])
...
if test "$ac_cv_search_gethostbyname" = "no"; then
save_LIBS="$LIBS"
LIBS="$LIBS -lwsock32"
AC_MSG_CHECKING([whether we need -lwsock32])
AC_LINK_IFELSE([
AC_LANG_PROGRAM([[
#include <ws2tcpip.h>
]], [gethostbyname ("foo");])],
need_wsock32=yes, need_wsock32=no)
AC_MSG_RESULT($need_wsock32)
LIBS="$save_LIBS"
if test "$need_wsock32" = "yes"; then
LIBS="$LIBS -lwsock32"
fi
fi
However, it seems rather ugly. I was hoping to be able to connect to
the AC_SEARCH_LIB logic somehow, so that it would do this
automatically. I want to be able to add the #include <ws2tcpip.h> to
the AC_SEARCH_LIB generated header.
But since the above seem to work, I think I'll move on unless someone
can come up with something cleaner.
Thanks!
> AC_CACHE_CHECK(for gethostbyname, gl_cv_func_gethostbyname, [
> gl_cv_func_gethostbyname=no
> gl_cv_lib_gethostbyname=no
> AC_TRY_LINK([
> #if HAVE_SYS_SOCKET_H
> # include <sys/socket.h>
> #elif HAVE_WINSOCK2_H
> # include <winsock2.h>
> #endif],
> [gethostbyname("");],
> gl_cv_func_gethostbyname=yes)
> if test "$gl_cv_func_gethostbyname" != yes; then
> am_save_LIBS="$LIBS"
> LIBS="$LIBS -lwsock32"
> AC_TRY_LINK([
> #if HAVE_SYS_SOCKET_H
> # include <sys/socket.h>
> #elif HAVE_WINSOCK2_H
> # include <winsock2.h>
> #endif],
> [gethostbyname("");],
> gl_cv_lib_gethostbyname=yes
> gl_cv_func_gethostbyname=yes)
> LIBS="$am_save_LIBS"
> fi
> ])
>
> Bruno
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