| dnl Copyright (C) 2000-2024 Free Software Foundation, Inc. |
| dnl |
| dnl GCC is free software; you can redistribute it and/or modify |
| dnl it under the terms of the GNU General Public License as published by |
| dnl the Free Software Foundation; either version 3, or (at your option) |
| dnl any later version. |
| dnl |
| dnl GCC is distributed in the hope that it will be useful, |
| dnl but WITHOUT ANY WARRANTY; without even the implied warranty of |
| dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| dnl GNU General Public License for more details. |
| dnl |
| dnl You should have received a copy of the GNU General Public License |
| dnl along with GCC; see the file COPYING3. If not see |
| dnl <http://www.gnu.org/licenses/>. |
| |
| 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([GCC_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 <stdlib.h> |
| #include <string.h> |
| #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 |
| |
| int |
| main (void) |
| { |
| #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=yes) |
| 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([#include <stdlib.h> |
| |
| int |
| find_stack_direction (void) |
| { |
| static char *addr = 0; |
| auto char dummy; |
| if (addr == 0) |
| { |
| addr = &dummy; |
| return find_stack_direction (); |
| } |
| else |
| return (&dummy > addr) ? 1 : -1; |
| } |
| |
| int |
| main (void) |
| { |
| 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]) |
| ]) |