1sinclude(../config/acx.m4) 2sinclude(../config/cet.m4) 3sinclude(../config/enable.m4) 4sinclude(../config/no-executables.m4) 5sinclude(../config/override.m4) 6sinclude(../config/picflag.m4) 7sinclude(../config/warnings.m4) 8 9dnl See whether strncmp reads past the end of its string parameters. 10dnl On some versions of SunOS4 at least, strncmp reads a word at a time 11dnl but erroneously reads past the end of strings. This can cause 12dnl a SEGV in some cases. 13AC_DEFUN(libiberty_AC_FUNC_STRNCMP, 14[AC_REQUIRE([AC_FUNC_MMAP]) 15AC_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 46main () 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) 78rm -f core core.* *.core]) 79if test $ac_cv_func_strncmp_works = no ; then 80 AC_LIBOBJ([strncmp]) 81fi 82]) 83 84dnl See if errno must be declared even when <errno.h> is included. 85AC_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;], 90libiberty_cv_declare_errno=no, 91libiberty_cv_declare_errno=yes)]) 92if test $libiberty_cv_declare_errno = yes 93then AC_DEFINE(NEED_DECLARATION_ERRNO, 1, 94 [Define if errno must be declared even when <errno.h> is included.]) 95fi 96]) 97 98dnl See whether we need a declaration for a function. 99AC_DEFUN(libiberty_NEED_DECLARATION, 100[AC_MSG_CHECKING([whether $1 must be declared]) 101AC_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], 119libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)]) 120AC_MSG_RESULT($libiberty_cv_decl_needed_$1) 121if test $libiberty_cv_decl_needed_$1 = yes; then 122 AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1, 123 [Define if $1 is not declared in system header files.]) 124fi 125])dnl 126 127# We always want a C version of alloca() compiled into libiberty, 128# because native-compiler support for the real alloca is so !@#$% 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. 132AC_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) 136webecray 137#else 138wenotbecray 139#endif 140], ac_cv_os_cray=yes, ac_cv_os_cray=no)]) 141if 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 149fi 150 151AC_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} 164main () 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)]) 171AC_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]) 178