aclocal.m4

来自「TCPDUMP的C语言源代码,是在数据链路层的应用」· M4 代码 · 共 1,288 行 · 第 1/3 页

		    ac_cv_lbl_gcc_fixincludes=yes,
		    ac_cv_lbl_gcc_fixincludes=no))
	    AC_MSG_RESULT($ac_cv_lbl_gcc_fixincludes)
	    if test $ac_cv_lbl_gcc_fixincludes = no ; then
		    # Don't cache failure
		    unset ac_cv_lbl_gcc_fixincludes
		    AC_MSG_ERROR(see the INSTALL for more info)
	    fi
    fi])

dnl
dnl Check for flex, default to lex
dnl Require flex 2.4 or higher
dnl Check for bison, default to yacc
dnl Default to lex/yacc if both flex and bison are not available
dnl Define the yy prefix string if using flex and bison
dnl
dnl usage:
dnl
dnl	AC_LBL_LEX_AND_YACC(lex, yacc, yyprefix)
dnl
dnl results:
dnl
dnl	$1 (lex set)
dnl	$2 (yacc appended)
dnl	$3 (optional flex and bison -P prefix)
dnl
AC_DEFUN(AC_LBL_LEX_AND_YACC,
    [AC_ARG_WITH(flex, [  --without-flex          don't use flex])
    AC_ARG_WITH(bison, [  --without-bison         don't use bison])
    if test "$with_flex" = no ; then
	    $1=lex
    else
	    AC_CHECK_PROGS($1, flex, lex)
    fi
    if test "$$1" = flex ; then
	    # The -V flag was added in 2.4
	    AC_MSG_CHECKING(for flex 2.4 or higher)
	    AC_CACHE_VAL(ac_cv_lbl_flex_v24,
		if flex -V >/dev/null 2>&1; then
			ac_cv_lbl_flex_v24=yes
		else
			ac_cv_lbl_flex_v24=no
		fi)
	    AC_MSG_RESULT($ac_cv_lbl_flex_v24)
	    if test $ac_cv_lbl_flex_v24 = no ; then
		    s="2.4 or higher required"
		    AC_MSG_WARN(ignoring obsolete flex executable ($s))
		    $1=lex
	    fi
    fi
    if test "$with_bison" = no ; then
	    $2=yacc
    else
	    AC_CHECK_PROGS($2, bison, yacc)
    fi
    if test "$$2" = bison ; then
	    $2="$$2 -y"
    fi
    if test "$$1" != lex -a "$$2" = yacc -o "$$1" = lex -a "$$2" != yacc ; then
	    AC_MSG_WARN(don't have both flex and bison; reverting to lex/yacc)
	    $1=lex
	    $2=yacc
    fi
    if test "$$1" = flex -a -n "$3" ; then
	    $1="$$1 -P$3"
	    $2="$$2 -p $3"
    fi])

dnl
dnl Checks to see if union wait is used with WEXITSTATUS()
dnl
dnl usage:
dnl
dnl	AC_LBL_UNION_WAIT
dnl
dnl results:
dnl
dnl	DECLWAITSTATUS (defined)
dnl
AC_DEFUN(AC_LBL_UNION_WAIT,
    [AC_MSG_CHECKING(if union wait is used)
    AC_CACHE_VAL(ac_cv_lbl_union_wait,
	AC_TRY_COMPILE([
#	include <sys/types.h>
#	include <sys/wait.h>],
	    [int status;
	    u_int i = WEXITSTATUS(status);
	    u_int j = waitpid(0, &status, 0);],
	    ac_cv_lbl_union_wait=no,
	    ac_cv_lbl_union_wait=yes))
    AC_MSG_RESULT($ac_cv_lbl_union_wait)
    if test $ac_cv_lbl_union_wait = yes ; then
	    AC_DEFINE(DECLWAITSTATUS,union wait)
    else
	    AC_DEFINE(DECLWAITSTATUS,int)
    fi])

dnl
dnl Checks to see if the sockaddr struct has the 4.4 BSD sa_len member
dnl
dnl usage:
dnl
dnl	AC_LBL_SOCKADDR_SA_LEN
dnl
dnl results:
dnl
dnl	HAVE_SOCKADDR_SA_LEN (defined)
dnl
AC_DEFUN(AC_LBL_SOCKADDR_SA_LEN,
    [AC_MSG_CHECKING(if sockaddr struct has sa_len member)
    AC_CACHE_VAL(ac_cv_lbl_sockaddr_has_sa_len,
	AC_TRY_COMPILE([
#	include <sys/types.h>
#	include <sys/socket.h>],
	[u_int i = sizeof(((struct sockaddr *)0)->sa_len)],
	ac_cv_lbl_sockaddr_has_sa_len=yes,
	ac_cv_lbl_sockaddr_has_sa_len=no))
    AC_MSG_RESULT($ac_cv_lbl_sockaddr_has_sa_len)
    if test $ac_cv_lbl_sockaddr_has_sa_len = yes ; then
	    AC_DEFINE(HAVE_SOCKADDR_SA_LEN)
    fi])

dnl
dnl Checks to see if -R is used
dnl
dnl usage:
dnl
dnl	AC_LBL_HAVE_RUN_PATH
dnl
dnl results:
dnl
dnl	ac_cv_lbl_have_run_path (yes or no)
dnl
AC_DEFUN(AC_LBL_HAVE_RUN_PATH,
    [AC_MSG_CHECKING(for ${CC-cc} -R)
    AC_CACHE_VAL(ac_cv_lbl_have_run_path,
	[echo 'main(){}' > conftest.c
	${CC-cc} -o conftest conftest.c -R/a1/b2/c3 >conftest.out 2>&1
	if test ! -s conftest.out ; then
		ac_cv_lbl_have_run_path=yes
	else
		ac_cv_lbl_have_run_path=no
	fi
	rm -f conftest*])
    AC_MSG_RESULT($ac_cv_lbl_have_run_path)
    ])

dnl
dnl Check whether a given format can be used to print 64-bit integers
dnl
AC_DEFUN(AC_LBL_CHECK_64BIT_FORMAT,
  [
    AC_MSG_CHECKING([whether %$1x can be used to format 64-bit integers])
    AC_RUN_IFELSE(
      [
	AC_LANG_SOURCE(
	  [[
#	    ifdef HAVE_INTTYPES_H
	    #include <inttypes.h>
#	    endif
#	    ifdef HAVE_SYS_BITYPES_H
            #include <sys/bitypes.h>
#	    endif
	    #include <stdio.h>
	    #include <sys/types.h>

	    main()
	    {
	      u_int64_t t = 1;
	      char strbuf[16+1];
	      sprintf(strbuf, "%016$1x", t << 32);
	      if (strcmp(strbuf, "0000000100000000") == 0)
		exit(0);
	      else
		exit(1);
	    }
	  ]])
      ],
      [
	AC_DEFINE(PRId64, "$1d")
	AC_DEFINE(PRIo64, "$1o")
	AC_DEFINE(PRIx64, "$1x")
	AC_DEFINE(PRIu64, "$1u")
	AC_MSG_RESULT(yes)
      ],
      [
	AC_MSG_RESULT(no)
	$2
      ])
  ])

dnl
dnl Checks to see if unaligned memory accesses fail
dnl
dnl usage:
dnl
dnl	AC_LBL_UNALIGNED_ACCESS
dnl
dnl results:
dnl
dnl	LBL_ALIGN (DEFINED)
dnl
AC_DEFUN(AC_LBL_UNALIGNED_ACCESS,
    [AC_MSG_CHECKING(if unaligned accesses fail)
    AC_CACHE_VAL(ac_cv_lbl_unaligned_fail,
	[case "$host_cpu" in

	#
	# These are CPU types where:
	#
	#	the CPU faults on an unaligned access, but at least some
	#	OSes that support that CPU catch the fault and simulate
	#	the unaligned access (e.g., Alpha/{Digital,Tru64} UNIX) -
	#	the simulation is slow, so we don't want to use it;
	#
	#	the CPU, I infer (from the old
	#
	# XXX: should also check that they don't do weird things (like on arm)
	#
	#	comment) doesn't fault on unaligned accesses, but doesn't
	#	do a normal unaligned fetch, either (e.g., presumably, ARM);
	#
	#	for whatever reason, the test program doesn't work
	#	(this has been claimed to be the case for several of those
	#	CPUs - I don't know what the problem is; the problem
	#	was reported as "the test program dumps core" for SuperH,
	#	but that's what the test program is *supposed* to do -
	#	it dumps core before it writes anything, so the test
	#	for an empty output file should find an empty output
	#	file and conclude that unaligned accesses don't work).
	#
	# This run-time test won't work if you're cross-compiling, so
	# in order to support cross-compiling for a particular CPU,
	# we have to wire in the list of CPU types anyway, as far as
	# I know, so perhaps we should just have a set of CPUs on
	# which we know it doesn't work, a set of CPUs on which we
	# know it does work, and have the script just fail on other
	# cpu types and update it when such a failure occurs.
	#
	alpha*|arm*|bfin*|hp*|mips*|sh*|sparc*|ia64|nv1)
		ac_cv_lbl_unaligned_fail=yes
		;;

	*)
		cat >conftest.c <<EOF
#		include <sys/types.h>
#		include <sys/wait.h>
#		include <stdio.h>
		unsigned char a[[5]] = { 1, 2, 3, 4, 5 };
		main() {
		unsigned int i;
		pid_t pid;
		int status;
		/* avoid "core dumped" message */
		pid = fork();
		if (pid <  0)
			exit(2);
		if (pid > 0) {
			/* parent */
			pid = waitpid(pid, &status, 0);
			if (pid < 0)
				exit(3);
			exit(!WIFEXITED(status));
		}
		/* child */
		i = *(unsigned int *)&a[[1]];
		printf("%d\n", i);
		exit(0);
		}
EOF
		${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \
		    conftest.c $LIBS >/dev/null 2>&1
		if test ! -x conftest ; then
			dnl failed to compile for some reason
			ac_cv_lbl_unaligned_fail=yes
		else
			./conftest >conftest.out
			if test ! -s conftest.out ; then
				ac_cv_lbl_unaligned_fail=yes
			else
				ac_cv_lbl_unaligned_fail=no
			fi
		fi
		rm -f conftest* core core.conftest
		;;
	esac])
    AC_MSG_RESULT($ac_cv_lbl_unaligned_fail)
    if test $ac_cv_lbl_unaligned_fail = yes ; then
	    AC_DEFINE(LBL_ALIGN)
    fi])

dnl
dnl If using gcc and the file .devel exists:
dnl	Compile with -g (if supported) and -Wall
dnl	If using gcc 2 or later, do extra prototype checking and some other
dnl	checks
dnl	If an os prototype include exists, symlink os-proto.h to it
dnl
dnl usage:
dnl
dnl	AC_LBL_DEVEL(copt)
dnl
dnl results:
dnl
dnl	$1 (copt appended)
dnl	HAVE_OS_PROTO_H (defined)
dnl	os-proto.h (symlinked)
dnl
AC_DEFUN(AC_LBL_DEVEL,
    [rm -f os-proto.h
    if test "${LBL_CFLAGS+set}" = set; then
	    $1="$$1 ${LBL_CFLAGS}"
    fi
    if test -f .devel ; then
	    if test "$GCC" = yes ; then
		    if test "${LBL_CFLAGS+set}" != set; then
			    if test "$ac_cv_prog_cc_g" = yes ; then
				    $1="-g $$1"
			    fi
			    $1="$$1 -Wall"
			    if test $ac_cv_lbl_gcc_vers -gt 1 ; then
				    $1="$$1 -Wmissing-prototypes -Wstrict-prototypes -Wwrite-strings -Wpointer-arith -W"
			    fi
		    fi
	    else
		    case "$host_os" in

		    irix6*)
			    V_CCOPT="$V_CCOPT -n32"
			    ;;

		    *)
			    ;;
		    esac
	    fi
	    os=`echo $host_os | sed -e 's/\([[0-9]][[0-9]]*\)[[^0-9]].*$/\1/'`
	    name="lbl/os-$os.h"
	    if test -f $name ; then
		    ln -s $name os-proto.h
		    AC_DEFINE(HAVE_OS_PROTO_H)
	    else
		    AC_MSG_WARN(can't find $name)
	    fi
    fi])

dnl
dnl Improved version of AC_CHECK_LIB
dnl
dnl Thanks to John Hawkinson ([e-mail])
dnl
dnl usage:
dnl
dnl	AC_LBL_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [,
dnl	    ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
dnl
dnl results:
dnl
dnl	LIBS
dnl
dnl XXX - "AC_LBL_LIBRARY_NET" was redone to use "AC_SEARCH_LIBS"
dnl rather than "AC_LBL_CHECK_LIB", so this isn't used any more.
dnl We keep it around for reference purposes in case it's ever
dnl useful in the future.
dnl

define(AC_LBL_CHECK_LIB,
[AC_MSG_CHECKING([for $2 in -l$1])
dnl Use a cache variable name containing the library, function
dnl name, and extra libraries to link with, because the test really is
dnl for library $1 defining function $2, when linked with potinal
dnl library $5, not just for library $1.  Separate tests with the same
dnl $1 and different $2's or $5's may have different results.
ac_lib_var=`echo $1['_']$2['_']$5 | sed 'y%./+- %__p__%'`
AC_CACHE_VAL(ac_cv_lbl_lib_$ac_lib_var,
[ac_save_LIBS="$LIBS"
LIBS="-l$1 $5 $LIBS"
AC_TRY_LINK(dnl
ifelse([$2], [main], , dnl Avoid conflicting decl of main.
[/* Override any gcc2 internal prototype to avoid an error.  */
]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
extern "C"
#endif
])dnl
[/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char $2();
]),
	    [$2()],
	    eval "ac_cv_lbl_lib_$ac_lib_var=yes",
	    eval "ac_cv_lbl_lib_$ac_lib_var=no")
LIBS="$ac_save_LIBS"
])dnl
if eval "test \"`echo '$ac_cv_lbl_lib_'$ac_lib_var`\" = yes"; then
  AC_MSG_RESULT(yes)
  ifelse([$3], ,
[changequote(, )dnl
  ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
changequote([, ])dnl
  AC_DEFINE_UNQUOTED($ac_tr_lib)
  LIBS="-l$1 $LIBS"
], [$3])
else
  AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])

dnl
dnl AC_LBL_LIBRARY_NET
dnl
dnl This test is for network applications that need socket() and
dnl gethostbyname() -ish functions.  Under Solaris, those applications
dnl need to link with "-lsocket -lnsl".  Under IRIX, they need to link
dnl with "-lnsl" but should *not* link with "-lsocket" because
dnl libsocket.a breaks a number of things (for instance:
dnl gethostbyname() under IRIX 5.2, and snoop sockets under most
dnl versions of IRIX).
dnl
dnl Unfortunately, many application developers are not aware of this,
dnl and mistakenly write tests that cause -lsocket to be used under
dnl IRIX.  It is also easy to write tests that cause -lnsl to be used
dnl under operating systems where neither are necessary (or useful),
dnl such as SunOS 4.1.4, which uses -lnsl for TLI.
dnl
dnl This test exists so that every application developer does not test
dnl this in a different, and subtly broken fashion.