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