mirror of git://gcc.gnu.org/git/gcc.git
176 lines
4.7 KiB
Plaintext
176 lines
4.7 KiB
Plaintext
sinclude(../config/acx.m4)
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sinclude(../config/no-executables.m4)
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sinclude(../config/override.m4)
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sinclude(../config/picflag.m4)
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sinclude(../config/warnings.m4)
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dnl See whether strncmp reads past the end of its string parameters.
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dnl On some versions of SunOS4 at least, strncmp reads a word at a time
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dnl but erroneously reads past the end of strings. This can cause
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dnl a SEGV in some cases.
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AC_DEFUN(libiberty_AC_FUNC_STRNCMP,
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[AC_REQUIRE([AC_FUNC_MMAP])
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AC_CACHE_CHECK([for working strncmp], ac_cv_func_strncmp_works,
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[AC_TRY_RUN([
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/* Test by Jim Wilson and Kaveh Ghazi.
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Check whether strncmp reads past the end of its string parameters. */
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#include <sys/types.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifndef MAP_ANON
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#ifdef MAP_ANONYMOUS
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#define MAP_ANON MAP_ANONYMOUS
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#else
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#define MAP_ANON MAP_FILE
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#endif
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#endif
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#ifndef MAP_FILE
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#define MAP_FILE 0
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#endif
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#define MAP_LEN 0x10000
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main ()
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{
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#if defined(HAVE_MMAP) || defined(HAVE_MMAP_ANYWHERE)
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char *p;
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int dev_zero;
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dev_zero = open ("/dev/zero", O_RDONLY);
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if (dev_zero < 0)
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exit (1);
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p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, dev_zero, 0);
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if (p == (char *)-1)
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p = (char *) mmap (0, MAP_LEN, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, -1, 0);
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if (p == (char *)-1)
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exit (2);
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else
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{
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char *string = "__si_type_info";
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char *q = (char *) p + MAP_LEN - strlen (string) - 2;
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char *r = (char *) p + 0xe;
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strcpy (q, string);
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strcpy (r, string);
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strncmp (r, q, 14);
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}
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#endif /* HAVE_MMAP || HAVE_MMAP_ANYWHERE */
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exit (0);
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}
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], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
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ac_cv_func_strncmp_works=yes)
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rm -f core core.* *.core])
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if test $ac_cv_func_strncmp_works = no ; then
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AC_LIBOBJ([strncmp])
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fi
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])
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dnl See if errno must be declared even when <errno.h> is included.
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AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
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[AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
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[AC_TRY_COMPILE(
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[#include <errno.h>],
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[int x = errno;],
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libiberty_cv_declare_errno=no,
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libiberty_cv_declare_errno=yes)])
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if test $libiberty_cv_declare_errno = yes
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then AC_DEFINE(NEED_DECLARATION_ERRNO, 1,
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[Define if errno must be declared even when <errno.h> is included.])
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fi
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])
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dnl See whether we need a declaration for a function.
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AC_DEFUN(libiberty_NEED_DECLARATION,
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[AC_MSG_CHECKING([whether $1 must be declared])
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AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
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[AC_TRY_COMPILE([
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#include "confdefs.h"
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#include <stdio.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif],
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[char *(*pfn) = (char *(*)) $1],
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libiberty_cv_decl_needed_$1=no, libiberty_cv_decl_needed_$1=yes)])
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AC_MSG_RESULT($libiberty_cv_decl_needed_$1)
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if test $libiberty_cv_decl_needed_$1 = yes; then
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AC_DEFINE([NEED_DECLARATION_]translit($1, [a-z], [A-Z]), 1,
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[Define if $1 is not declared in system header files.])
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fi
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])dnl
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# We always want a C version of alloca() compiled into libiberty,
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# because native-compiler support for the real alloca is so !@#$%
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# unreliable that GCC has decided to use it only when being compiled
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# by GCC. This is the part of AC_FUNC_ALLOCA that calculates the
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# information alloca.c needs.
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AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
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[AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
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[AC_EGREP_CPP(webecray,
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[#if defined(CRAY) && ! defined(CRAY2)
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webecray
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#else
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wenotbecray
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#endif
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], ac_cv_os_cray=yes, ac_cv_os_cray=no)])
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if test $ac_cv_os_cray = yes; then
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for ac_func in _getb67 GETB67 getb67; do
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AC_CHECK_FUNC($ac_func,
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[AC_DEFINE_UNQUOTED(CRAY_STACKSEG_END, $ac_func,
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[Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP
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systems. This function is required for alloca.c support on those
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systems.]) break])
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done
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fi
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AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
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[AC_TRY_RUN([find_stack_direction ()
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{
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static char *addr = 0;
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auto char dummy;
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if (addr == 0)
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{
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addr = &dummy;
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return find_stack_direction ();
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}
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else
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return (&dummy > addr) ? 1 : -1;
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}
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main ()
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{
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exit (find_stack_direction() < 0);
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}],
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ac_cv_c_stack_direction=1,
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ac_cv_c_stack_direction=-1,
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ac_cv_c_stack_direction=0)])
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AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction,
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[Define if you know the direction of stack growth for your system;
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otherwise it will be automatically deduced at run-time.
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STACK_DIRECTION > 0 => grows toward higher addresses
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STACK_DIRECTION < 0 => grows toward lower addresses
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STACK_DIRECTION = 0 => direction of growth unknown])
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])
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