141 lines
4.1 KiB
Text
141 lines
4.1 KiB
Text
dnl $Id: aclocal.m4,v 1.1.1.1 2003/03/31 05:02:22 grant Exp $
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dnl
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dnl
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dnl AC_MSG_TRY_COMPILE
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dnl
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dnl Written by Luke Mewburn <lukem@netbsd.org>
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dnl
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dnl Usage:
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dnl AC_MSG_TRY_COMPILE(Message, CacheVar, Includes, Code,
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dnl ActionPass [,ActionFail] )
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dnl
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dnl effectively does:
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dnl AC_CACHE_CHECK(Message, CacheVar,
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dnl AC_TRY_COMPILE(Includes, Code, CacheVar = yes, CacheVar = no)
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dnl if CacheVar == yes
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dnl AC_MESSAGE_RESULT(yes)
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dnl ActionPass
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dnl else
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dnl AC_MESSAGE_RESULT(no)
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dnl ActionFail
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dnl )
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dnl
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AC_DEFUN(AC_MSG_TRY_COMPILE, [
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AC_CACHE_CHECK($1, $2, [
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AC_TRY_COMPILE([ $3 ], [ $4; ], [ $2=yes ], [ $2=no ])
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])
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if test "x[$]$2" = "xyes"; then
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$5
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else
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$6
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:
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fi
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])
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dnl
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dnl AC_MSG_TRY_LINK
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dnl
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dnl Usage:
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dnl AC_MSG_TRY_LINK(Message, CacheVar, Includes, Code,
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dnl ActionPass [,ActionFail] )
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dnl
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dnl as AC_MSG_TRY_COMPILE, but uses AC_TRY_LINK instead of AC_TRY_COMPILE
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dnl
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AC_DEFUN(AC_MSG_TRY_LINK, [
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AC_CACHE_CHECK($1, $2, [
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AC_TRY_LINK([ $3 ], [ $4; ], [ $2=yes ], [ $2=no ])
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])
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if test "x[$]$2" = "xyes"; then
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$5
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else
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$6
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:
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fi
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])
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dnl
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dnl AC_LIBRARY_NET: #Id: net.m4,v 1.5 1997/11/09 21:36:54 jhawk Exp #
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dnl
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dnl Written by John Hawkinson <jhawk@mit.edu>. This code is in the Public
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dnl Domain.
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dnl
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dnl This test is for network applications that need socket() and
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dnl gethostbyname() -ish functions. Under Solaris, those applications need to
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dnl link with "-lsocket -lnsl". Under IRIX, they should *not* link with
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dnl "-lsocket" because libsocket.a breaks a number of things (for instance:
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dnl gethostbyname() under IRIX 5.2, and snoop sockets under most versions of
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dnl IRIX).
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dnl
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dnl Unfortunately, many application developers are not aware of this, and
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dnl mistakenly write tests that cause -lsocket to be used under IRIX. It is
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dnl also easy to write tests that cause -lnsl to be used under operating
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dnl systems where neither are necessary (or useful), such as SunOS 4.1.4, which
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dnl uses -lnsl for TLI.
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dnl
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dnl This test exists so that every application developer does not test this in
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dnl a different, and subtly broken fashion.
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dnl
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dnl It has been argued that this test should be broken up into two seperate
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dnl tests, one for the resolver libraries, and one for the libraries necessary
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dnl for using Sockets API. Unfortunately, the two are carefully intertwined and
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dnl allowing the autoconf user to use them independantly potentially results in
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dnl unfortunate ordering dependancies -- as such, such component macros would
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dnl have to carefully use indirection and be aware if the other components were
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dnl executed. Since other autoconf macros do not go to this trouble, and almost
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dnl no applications use sockets without the resolver, this complexity has not
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dnl been implemented.
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dnl
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dnl The check for libresolv is in case you are attempting to link statically
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dnl and happen to have a libresolv.a lying around (and no libnsl.a).
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dnl
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AC_DEFUN(AC_LIBRARY_NET, [
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# Most operating systems have gethostbyname() in the default searched
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# libraries (i.e. libc):
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AC_CHECK_FUNC(gethostbyname, ,
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# Some OSes (eg. Solaris) place it in libnsl:
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AC_CHECK_LIB(nsl, gethostbyname, ,
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# Some strange OSes (SINIX) have it in libsocket:
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AC_CHECK_LIB(socket, gethostbyname, ,
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# Unfortunately libsocket sometimes depends on libnsl.
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# AC_CHECK_LIB's API is essentially broken so the following
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# ugliness is necessary:
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AC_CHECK_LIB(socket, gethostbyname,
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LIBS="-lsocket -lnsl $LIBS",
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AC_CHECK_LIB(resolv, gethostbyname),
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-lnsl)
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)
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)
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)
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AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket, ,
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AC_CHECK_LIB(socket, socket, LIBS="-lsocket -lnsl $LIBS", , -lnsl)))
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])
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dnl
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dnl Test for __attribute__
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dnl
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AC_DEFUN(AC_C___ATTRIBUTE__, [
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AC_MSG_CHECKING(for __attribute__)
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AC_CACHE_VAL(ac_cv___attribute__, [
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AC_TRY_COMPILE([
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#include <stdlib.h>
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],
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[
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static void foo(void) __attribute__ ((noreturn));
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static void
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foo(void)
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{
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exit(1);
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}
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],
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ac_cv___attribute__=yes,
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ac_cv___attribute__=no)])
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if test "$ac_cv___attribute__" = "yes"; then
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AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
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fi
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AC_MSG_RESULT($ac_cv___attribute__)
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])
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