libiberty/aclocal.m4

   1 sinclude(../config/acx.m4)
   2 sinclude(../config/cet.m4)
   3 sinclude(../config/enable.m4)
   4 sinclude(../config/no-executables.m4)
   5 sinclude(../config/override.m4)
   6 sinclude(../config/picflag.m4)
   7 sinclude(../config/warnings.m4)
   8
   9 dnl See whether strncmp reads past the end of its string parameters.
  10 dnl On some versions of SunOS4 at least, strncmp reads a word at a time
  11 dnl but erroneously reads past the end of strings.  This can cause
  12 dnl a SEGV in some cases.
  13 AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
  14 [AC_REQUIRE([AC_FUNC_MMAP])
  15 AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
  16 [AC_TRY_RUN([
  17 /* Test by Jim Wilson and Kaveh Ghazi.
  18    Check whether strncmp reads past the end of its string parameters. */
  19 #include <sys/types.h>
  20
  21 #ifdef HAVE_FCNTL_H
  22 #include <fcntl.h>
  23 #endif
  24
  25 #ifdef HAVE_SYS_MMAN_H
  26 #include <sys/mman.h>
  27 #endif
  28
  29 #ifndef MAP_ANON
  30 #ifdef MAP_ANONYMOUS
  31 #define MAP_ANON MAP_ANONYMOUS
  32 #else
  33 #define MAP_ANON MAP_FILE
  34 #endif
  35 #endif
  36
  37 #ifndef MAP_FILE
  38 #define MAP_FILE 0
  39 #endif
  40 #ifndef O_RDONLY
  41 #define O_RDONLY 0
  42 #endif
  43
  44 #define MAP_LEN 0x10000
  45
  46 main ()
  47 {
  48 #if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
  49   char *p;
  50   int dev_zero;
  51
  52   dev_zero = open ("/dev/zero", O_RDONLY);
  53   if (dev_zero < 0)
  54     exit (1);
  55
  56   p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
  57                      MAP_ANON|MAP_PRIVATE, dev_zero, 0);
  58   if (p == (char *)-1)
  59     p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
  60                        MAP_ANON|MAP_PRIVATE, -1, 0);
  61   if (p == (char *)-1)
  62     exit (2);
  63   else
  64     {
  65       char *string = "__si_type_info";
  66       char *q = (char *) p + MAP_LEN - strlen (string) - 2;
  67       char *r = (char *) p + 0xe;
  68
  69       strcpy (q, string);
  70       strcpy (r, string);
  71       strncmp (r, q, 14);
  72     }
  73 #endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
  74   exit (0);
  75 }
  76 ], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
  77   ac_cv_func_strncmp_works=yes)
  78 rm -f core core.* *.core])
  79 if test $ac_cv_func_strncmp_works = no ; then
  80   AC_LIBOBJ([strncmp])
  81 fi
  82 ])
  83
  84 dnl See if errno must be declared even when <errno.h> is included.
  85 AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
  86 [AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
  87 [AC_TRY_COMPILE(
  88 [#include <errno.h>],
  89 [int x = errno;],
  90 libiberty_cv_declare_errno=no,
  91 libiberty_cv_declare_errno=yes)])
  92 if test $libiberty_cv_declare_errno = yes
  93 then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,
  94   [Define if errno must be declared even when <errno.h> is included.])
  95 fi
  96 ])
  97
  98 dnl See whether we need a declaration for a function.
  99 AC_DEFUN(libiberty_NEED_DECLARATION,
 100 [AC_MSG_CHECKING([whether $1 must be declared])
 101 AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
 102 [AC_TRY_COMPILE([
 103 #include "confdefs.h"
 104 #include <stdio.h>
 105 #ifdef HAVE_STRING_H
 106 #include <string.h>
 107 #else
 108 #ifdef HAVE_STRINGS_H
 109 #include <strings.h>
 110 #endif
 111 #endif
 112 #ifdef HAVE_STDLIB_H
 113 #include <stdlib.h>
 114 #endif
 115 #ifdef HAVE_UNISTD_H
 116 #include <unistd.h>
 117 #endif],
 118 [char *(*pfn) = (char *(*)) $1],
 119 libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])
 120 AC_MSG_RESULT($libiberty_cv_decl_needed_$1)
 121 if test $libiberty_cv_decl_needed_$1 = yes; then
 122   AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,
 123             [Define if $1 is not declared in system header files.])
 124 fi
 125 ])dnl
 126
 127 # We always want a C version of alloca() compiled into libiberty,
 128 # because native-compiler support for the real alloca is so !@#$%
 129 # unreliable that GCC has decided to use it only when being compiled
 130 # by GCC.  This is the part of AC_FUNC_ALLOCA that calculates the
 131 # information alloca.c needs.
 132 AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
 133 [AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
 134 [AC_EGREP_CPP(webecray,
 135 [#if defined(CRAY) && ! defined(CRAY2)
 136 webecray
 137 #else
 138 wenotbecray
 139 #endif
 140 ], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
 141 if test $ac_cv_os_cray = yes; then
 142   for ac_func in _getb67 GETB67 getb67; do
 143     AC_CHECK_FUNC($ac_func,
 144       [AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,
 145   [Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
 146    systems. This function is required for alloca.c support on those
 147    systems.])  break])
 148   done
 149 fi
 150
 151 AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
 152 [AC_TRY_RUN([find_stack_direction ()
 153 {
 154   static char *addr = 0;
 155   auto char dummy;
 156   if (addr == 0)
 157     {
 158       addr = &dummy;
 159       return find_stack_direction ();
 160     }
 161   else
 162     return (&dummy > addr) ? 1 : -1;
 163 }
 164 main ()
 165 {
 166   exit (find_stack_direction() < 0);
 167 }],
 168   ac_cv_c_stack_direction=1,
 169   ac_cv_c_stack_direction=-1,
 170   ac_cv_c_stack_direction=0)])
 171 AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,
 172   [Define if you know the direction of stack growth for your system;
 173    otherwise it will be automatically deduced at run-time.
 174         STACK_DIRECTION > 0 => grows toward higher addresses
 175         STACK_DIRECTION < 0 => grows toward lower addresses
 176         STACK_DIRECTION = 0 => direction of growth unknown])
 177 ])