Subversion Repositories scarts

sinclude(../config/acx.m4)

sinclude(../config/no-executables.m4)

sinclude(../config/warnings.m4)

dnl See whether strncmp reads past the end of its string parameters.

dnl On some versions of SunOS4 at least, strncmp reads a word at a time

dnl but erroneously reads past the end of strings.  This can cause

dnl a SEGV in some cases.

AC_DEFUN(libiberty_AC_FUNC_STRNCMP,

[AC_REQUIRE([AC_FUNC_MMAP])

AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,

[AC_TRY_RUN([

/* Test by Jim Wilson and Kaveh Ghazi.

   Check whether strncmp reads past the end of its string parameters. */

#include <sys/types.h>

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#ifdef HAVE_SYS_MMAN_H

#include <sys/mman.h>

#endif

#ifndef MAP_ANON

#ifdef MAP_ANONYMOUS

#define MAP_ANON MAP_ANONYMOUS

#else

#define MAP_ANON MAP_FILE

#endif

#endif

#ifndef MAP_FILE

#define MAP_FILE 0

#endif

#ifndef O_RDONLY

#define O_RDONLY 0

#endif

#define MAP_LEN 0x10000

main ()

{

#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)

  char *p;

  int dev_zero;

  dev_zero = open ("/dev/zero", O_RDONLY);

  if (dev_zero < 0)

    exit (1);

  p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,

                     MAP_ANON|MAP_PRIVATE, dev_zero, 0);

  if (p == (char *)-1)

    p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,

                       MAP_ANON|MAP_PRIVATE, -1, 0);

  if (p == (char *)-1)

    exit (2);

  else

    {

      char *string = "__si_type_info";

      char *q = (char *) p + MAP_LEN - strlen (string) - 2;

      char *r = (char *) p + 0xe;

      strcpy (q, string);

      strcpy (r, string);

      strncmp (r, q, 14);

    }

#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */

  exit (0);

}

], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,

  ac_cv_func_strncmp_works=no)

rm -f core core.* *.core])

if test $ac_cv_func_strncmp_works = no ; then

  AC_LIBOBJ([strncmp])

fi

])

dnl See if errno must be declared even when <errno.h> is included.

AC_DEFUN(libiberty_AC_DECLARE_ERRNO,

[AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,

[AC_TRY_COMPILE(

[#include <errno.h>],

[int x = errno;],

libiberty_cv_declare_errno=no,

libiberty_cv_declare_errno=yes)])

if test $libiberty_cv_declare_errno = yes

then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,

  [Define if errno must be declared even when <errno.h> is included.])

fi

])

dnl See whether we need a declaration for a function.

AC_DEFUN(libiberty_NEED_DECLARATION,

[AC_MSG_CHECKING([whether $1 must be declared])

AC_CACHE_VAL(libiberty_cv_decl_needed_$1,

[AC_TRY_COMPILE([

#include "confdefs.h"

#include <stdio.h>

#ifdef HAVE_STRING_H

#include <string.h>

#else

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif],

[char *(*pfn) = (char *(*)) $1],

libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])

AC_MSG_RESULT($libiberty_cv_decl_needed_$1)

if test $libiberty_cv_decl_needed_$1 = yes; then

  AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,

            [Define if $1 is not declared in system header files.])

fi

])dnl

# We always want a C version of alloca() compiled into libiberty,

# because native-compiler support for the real alloca is so !@#$%

# unreliable that GCC has decided to use it only when being compiled

# by GCC.  This is the part of AC_FUNC_ALLOCA that calculates the

# information alloca.c needs.

AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,

[AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,

[AC_EGREP_CPP(webecray,

[#if defined(CRAY) && ! defined(CRAY2)

webecray

#else

wenotbecray

#endif

], ac_cv_os_cray=yes, ac_cv_os_cray=no)])

if test $ac_cv_os_cray = yes; then

  for ac_func in _getb67 GETB67 getb67; do

    AC_CHECK_FUNC($ac_func,

      [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,

  [Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP

   systems. This function is required for alloca.c support on those

   systems.])  break])

  done

fi

AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,

[AC_TRY_RUN([find_stack_direction ()

{

  static char *addr = 0;

  auto char dummy;

  if (addr == 0)

    {

      addr = &dummy;

      return find_stack_direction ();

    }

  else

    return (&dummy > addr) ? 1 : -1;

}

main ()

{

  exit (find_stack_direction() < 0);

}],

  ac_cv_c_stack_direction=1,

  ac_cv_c_stack_direction=-1,

  ac_cv_c_stack_direction=0)])

AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,

  [Define if you know the direction of stack growth for your system;

   otherwise it will be automatically deduced at run-time.

        STACK_DIRECTION > 0 => grows toward higher addresses

        STACK_DIRECTION < 0 => grows toward lower addresses

        STACK_DIRECTION = 0 => direction of growth unknown])

])

# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)

# ----------------------------------

# Don't include <ctype.h> because on OSF/1 3.0 it includes

# <sys/types.h> which includes <sys/select.h> which contains a

# prototype for select.  Similarly for bzero.

#

# This test used to merely assign f=$1 in main(), but that was

# optimized away by HP unbundled cc A.05.36 for ia64 under +O3,

# presumably on the basis that there's no need to do that store if the

# program is about to exit.  Conversely, the AIX linker optimizes an

# unused external declaration that initializes f=$1.  So this test

# program has both an external initialization of f, and a use of f in

# main that affects the exit status.

#

m4_define([AC_LANG_FUNC_LINK_TRY(C)],

[AC_LANG_PROGRAM(

[/* System header to define __stub macros and hopefully few prototypes,

    which can conflict with char $1 (); below.

    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since

    <limits.h> exists even on freestanding compilers.  Under hpux,

    including <limits.h> includes <sys/time.h> and causes problems

    checking for functions defined therein.  */

#if defined (__STDC__) && !defined (_HPUX_SOURCE)

# include <limits.h>

#else

# include <assert.h>

#endif

/* Override any gcc2 internal prototype to avoid an error.  */

#ifdef __cplusplus

extern "C"

{

#endif

/* We use char because int might match the return type of a gcc2

   builtin and then its argument prototype would still apply.  */

char $1 ();

/* The GNU C library defines this for functions which it implements

    to always fail with ENOSYS.  Some functions are actually named

    something starting with __ and the normal name is an alias.  */

#if defined (__stub_$1) || defined (__stub___$1)

choke me

#else

char (*f) () = $1;

#endif

#ifdef __cplusplus

}

#endif

], [return f != $1;])])