FreeType 1.31.1

net.m4

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+dnl
+dnl The following was written by jhawk@mit.edu
+dnl
+dnl AC_LIBRARY_NET: Id: net.m4,v 1.4 1997/10/25 20:49:53 jhawk Exp 
+dnl
+dnl This test is for network applications that need socket() and
+dnl gethostbyname() -ish functions.  Under Solaris, those applications need to
+dnl link with "-lsocket -lnsl".  Under IRIX, they should *not* link with
+dnl "-lsocket" because libsocket.a breaks a number of things (for instance:
+dnl gethostbyname() under IRIX 5.2, and snoop sockets under most versions of
+dnl IRIX).
+dnl 
+dnl Unfortunately, many application developers are not aware of this, and
+dnl mistakenly write tests that cause -lsocket to be used under IRIX.  It is
+dnl also easy to write tests that cause -lnsl to be used under operating
+dnl systems where neither are necessary (or useful), such as SunOS 4.1.4, which
+dnl uses -lnsl for TLI.
+dnl 
+dnl This test exists so that every application developer does not test this in
+dnl a different, and subtly broken fashion.
+dnl 
+dnl It has been argued that this test should be broken up into two seperate
+dnl tests, one for the resolver libraries, and one for the libraries necessary
+dnl for using Sockets API. Unfortunately, the two are carefully intertwined and
+dnl allowing the autoconf user to use them independantly potentially results in
+dnl unfortunate ordering dependancies -- as such, such component macros would
+dnl have to carefully use indirection and be aware if the other components were
+dnl executed. Since other autoconf macros do not go to this trouble, and almost
+dnl no applications use sockets without the resolver, this complexity has not
+dnl been implemented.
+dnl
+dnl The check for libresolv is in case you are attempting to link statically
+dnl and happen to have a libresolv.a lying around (and no libnsl.a).
+dnl
+AC_DEFUN(AC_LIBRARY_NET, [
+   # Most operating systems have gethostbyname() in the default searched
+   # libraries (i.e. libc):
+   AC_CHECK_FUNC(gethostbyname, ,
+     # Some OSes (eg. Solaris) place it in libnsl:
+     AC_CHECK_LIB(nsl, gethostbyname, , 
+       # Some strange OSes (SINIX) have it in libsocket:
+       AC_CHECK_LIB(socket, gethostbyname, ,
+          # Unfortunately libsocket sometimes depends on libnsl.
+          # AC_CHECK_LIB's API is essentially broken so the following
+          # ugliness is necessary:
+          AC_CHECK_LIB(socket, gethostbyname,
+             LIBS="-lsocket -lnsl $LIBS",
+               AC_CHECK_LIB(resolv, gethostbyname),
+             -lnsl)
+       )
+     )
+   )
+  AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket, ,
+    AC_CHECK_LIB(socket, socket, LIBS="-lsocket -lnsl $LIBS", , -lnsl)))
+  ])