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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [libiberty/] [aclocal.m4] - Blame information for rev 816

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Line No. Rev Author Line
1 131 jeremybenn
sinclude(../config/acx.m4)
2
sinclude(../config/no-executables.m4)
3 225 jeremybenn
sinclude(../config/override.m4)
4 131 jeremybenn
sinclude(../config/warnings.m4)
5
 
6
dnl See whether strncmp reads past the end of its string parameters.
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dnl On some versions of SunOS4 at least, strncmp reads a word at a time
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dnl but erroneously reads past the end of strings.  This can cause
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dnl a SEGV in some cases.
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AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
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[AC_REQUIRE([AC_FUNC_MMAP])
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AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
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[AC_TRY_RUN([
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/* Test by Jim Wilson and Kaveh Ghazi.
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   Check whether strncmp reads past the end of its string parameters. */
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#include <sys/types.h>
17
 
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifndef MAP_ANON
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#ifdef MAP_ANONYMOUS
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#define MAP_ANON MAP_ANONYMOUS
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#else
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#define MAP_ANON MAP_FILE
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#endif
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#endif
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#endif
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#define MAP_LEN 0x10000
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43
main ()
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{
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#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
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  char *p;
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  int dev_zero;
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  dev_zero = open ("/dev/zero", O_RDONLY);
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  if (dev_zero < 0)
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    exit (1);
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  p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
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                     MAP_ANON|MAP_PRIVATE, dev_zero, 0);
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  if (p == (char *)-1)
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    p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
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                       MAP_ANON|MAP_PRIVATE, -1, 0);
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  if (p == (char *)-1)
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    exit (2);
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  else
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    {
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      char *string = "__si_type_info";
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      char *q = (char *) p + MAP_LEN - strlen (string) - 2;
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      char *r = (char *) p + 0xe;
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      strcpy (q, string);
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      strcpy (r, string);
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      strncmp (r, q, 14);
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    }
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#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
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  exit (0);
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}
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], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
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  ac_cv_func_strncmp_works=no)
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rm -f core core.* *.core])
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if test $ac_cv_func_strncmp_works = no ; then
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  AC_LIBOBJ([strncmp])
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fi
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])
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dnl See if errno must be declared even when <errno.h> is included.
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AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
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[AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
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[AC_TRY_COMPILE(
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[#include <errno.h>],
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[int x = errno;],
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libiberty_cv_declare_errno=no,
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libiberty_cv_declare_errno=yes)])
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if test $libiberty_cv_declare_errno = yes
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then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,
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  [Define if errno must be declared even when <errno.h> is included.])
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fi
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])
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dnl See whether we need a declaration for a function.
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AC_DEFUN(libiberty_NEED_DECLARATION,
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[AC_MSG_CHECKING([whether $1 must be declared])
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AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
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[AC_TRY_COMPILE([
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#include "confdefs.h"
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif],
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[char *(*pfn) = (char *(*)) $1],
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libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])
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AC_MSG_RESULT($libiberty_cv_decl_needed_$1)
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if test $libiberty_cv_decl_needed_$1 = yes; then
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  AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,
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            [Define if $1 is not declared in system header files.])
121
fi
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])dnl
123
 
124
# We always want a C version of alloca() compiled into libiberty,
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# because native-compiler support for the real alloca is so !@#$%
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# unreliable that GCC has decided to use it only when being compiled
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# by GCC.  This is the part of AC_FUNC_ALLOCA that calculates the
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# information alloca.c needs.
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AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
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[AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
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[AC_EGREP_CPP(webecray,
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[#if defined(CRAY) && ! defined(CRAY2)
133
webecray
134
#else
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wenotbecray
136
#endif
137
], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
138
if test $ac_cv_os_cray = yes; then
139
  for ac_func in _getb67 GETB67 getb67; do
140
    AC_CHECK_FUNC($ac_func,
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      [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,
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  [Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
143
   systems. This function is required for alloca.c support on those
144
   systems.])  break])
145
  done
146
fi
147
 
148
AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
149
[AC_TRY_RUN([find_stack_direction ()
150
{
151
  static char *addr = 0;
152
  auto char dummy;
153
  if (addr == 0)
154
    {
155
      addr = &dummy;
156
      return find_stack_direction ();
157
    }
158
  else
159
    return (&dummy > addr) ? 1 : -1;
160
}
161
main ()
162
{
163
  exit (find_stack_direction() < 0);
164
}],
165
  ac_cv_c_stack_direction=1,
166
  ac_cv_c_stack_direction=-1,
167
  ac_cv_c_stack_direction=0)])
168
AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,
169
  [Define if you know the direction of stack growth for your system;
170
   otherwise it will be automatically deduced at run-time.
171
        STACK_DIRECTION > 0 => grows toward higher addresses
172
        STACK_DIRECTION < 0 => grows toward lower addresses
173
        STACK_DIRECTION = 0 => direction of growth unknown])
174
])
175
 
176
# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
177
# ----------------------------------
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# Don't include <ctype.h> because on OSF/1 3.0 it includes
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# <sys/types.h> which includes <sys/select.h> which contains a
180
# prototype for select.  Similarly for bzero.
181
#
182
# This test used to merely assign f=$1 in main(), but that was
183
# optimized away by HP unbundled cc A.05.36 for ia64 under +O3,
184
# presumably on the basis that there's no need to do that store if the
185
# program is about to exit.  Conversely, the AIX linker optimizes an
186
# unused external declaration that initializes f=$1.  So this test
187
# program has both an external initialization of f, and a use of f in
188
# main that affects the exit status.
189
#
190
m4_define([AC_LANG_FUNC_LINK_TRY(C)],
191
[AC_LANG_PROGRAM(
192
[/* System header to define __stub macros and hopefully few prototypes,
193
    which can conflict with char $1 (); below.
194
    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
195
    <limits.h> exists even on freestanding compilers.  Under hpux,
196
    including <limits.h> includes <sys/time.h> and causes problems
197
    checking for functions defined therein.  */
198
#if defined (__STDC__) && !defined (_HPUX_SOURCE)
199
# include <limits.h>
200
#else
201
# include <assert.h>
202
#endif
203
/* Override any gcc2 internal prototype to avoid an error.  */
204
#ifdef __cplusplus
205
extern "C"
206
{
207
#endif
208
/* We use char because int might match the return type of a gcc2
209
   builtin and then its argument prototype would still apply.  */
210
char $1 ();
211
/* The GNU C library defines this for functions which it implements
212
    to always fail with ENOSYS.  Some functions are actually named
213
    something starting with __ and the normal name is an alias.  */
214
#if defined (__stub_$1) || defined (__stub___$1)
215
choke me
216
#else
217
char (*f) () = $1;
218
#endif
219
#ifdef __cplusplus
220
}
221
#endif
222
], [return f != $1;])])
223
 

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