1 files changed, 185 insertions, 0 deletions
diff --git a/libiberty/acinclude.m4 b/libiberty/acinclude.m4
new file mode 100644
index 0000000..6db0e50
--- /dev/null
+++ b/libiberty/acinclude.m4
@@ -0,0 +1,185 @@
+dnl Copyright (C) 2000-2021 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([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 <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
+
+main ()
+{
+#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([find_stack_direction ()
+{
+  static char *addr = 0;
+  auto char dummy;
+  if (addr == 0)
+    {
+      addr = &dummy;
+      return find_stack_direction ();
+    }
+  else
+    return (&dummy > addr) ? 1 : -1;
+}
+main ()
+{
+  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])
+])