sinclude(../config/acx.m4)
sinclude(../config/no-executables.m4)
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. */
main ()
{
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);
}
exit (0);
}
], ac_cv_func_strncmp_works=yes, ac_cv_func_strncmp_works=no,
ac_cv_func_strncmp_works=no)
rm -f core core.* *.core])
if test $ac_cv_func_strncmp_works = no ; then
AC_LIBOBJ([strncmp])
fi
])
AC_DEFUN(libiberty_AC_DECLARE_ERRNO,
[AC_CACHE_CHECK(whether errno must be declared, libiberty_cv_declare_errno,
[AC_TRY_COMPILE(
[[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
])
AC_DEFUN(libiberty_NEED_DECLARATION,
[AC_MSG_CHECKING([whether $1 must be declared])
AC_CACHE_VAL(libiberty_cv_decl_needed_$1,
[AC_TRY_COMPILE([
[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
])
AC_DEFUN(libiberty_AC_FUNC_C_ALLOCA,
[AC_CACHE_CHECK(whether alloca needs Cray hooks, ac_cv_os_cray,
[AC_EGREP_CPP(webecray,
[webecray
wenotbecray
], 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])
])
m4_define([AC_LANG_FUNC_LINK_TRY(C)],
[AC_LANG_PROGRAM(
[/* System header to define __stub macros and hopefully few prototypes,
which can conflict with char $1 (); below.
Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
<limits.h> exists even on freestanding compilers. Under hpux,
including <limits.h> includes <sys/time.h> and causes problems
checking for functions defined therein. */
/* Override any gcc2 internal prototype to avoid an error. */
extern "C"
{
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $1 ();
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
choke me
char (*f) () = $1;
}
], [return f != $1;])])