192 lines
5.3 KiB
Plaintext
192 lines
5.3 KiB
Plaintext
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=no)
|
|
rm -f core core.* *.core])
|
|
if test $ac_cv_func_strncmp_works = no ; then
|
|
LIBOBJS="$LIBOBJS strncmp.o"
|
|
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
|
|
])
|
|
|
|
# FIXME: We temporarily define our own version of AC_PROG_CC. This is
|
|
# copied from autoconf 2.12, but does not call AC_PROG_CC_WORKS. We
|
|
# are probably using a cross compiler, which will not be able to fully
|
|
# link an executable. This should really be fixed in autoconf
|
|
# itself.
|
|
|
|
AC_DEFUN(LIB_AC_PROG_CC,
|
|
[AC_BEFORE([$0], [AC_PROG_CPP])dnl
|
|
AC_PROVIDE([AC_PROG_CC])
|
|
AC_CHECK_PROG(CC, gcc, gcc)
|
|
if test -z "$CC"; then
|
|
AC_CHECK_PROG(CC, cc, cc, , , /usr/ucb/cc)
|
|
test -z "$CC" && AC_MSG_ERROR([no acceptable cc found in \$PATH])
|
|
fi
|
|
|
|
AC_PROG_CC_GNU
|
|
|
|
if test $ac_cv_prog_gcc = yes; then
|
|
GCC=yes
|
|
ac_libiberty_warn_cflags='-W -Wall -Wtraditional -pedantic'
|
|
dnl Check whether -g works, even if CFLAGS is set, in case the package
|
|
dnl plays around with CFLAGS (such as to build both debugging and
|
|
dnl normal versions of a library), tasteless as that idea is.
|
|
ac_test_CFLAGS="${CFLAGS+set}"
|
|
ac_save_CFLAGS="$CFLAGS"
|
|
CFLAGS=
|
|
AC_PROG_CC_G
|
|
if test "$ac_test_CFLAGS" = set; then
|
|
CFLAGS="$ac_save_CFLAGS"
|
|
elif test $ac_cv_prog_cc_g = yes; then
|
|
CFLAGS="-g -O2"
|
|
else
|
|
CFLAGS="-O2"
|
|
fi
|
|
else
|
|
GCC=
|
|
ac_libiberty_warn_cflags=
|
|
test "${CFLAGS+set}" = set || CFLAGS="-g"
|
|
fi
|
|
AC_SUBST(ac_libiberty_warn_cflags)
|
|
])
|
|
|
|
# Work around a bug in autoheader. This can go away when we switch to
|
|
# autoconf >2.50. The use of define instead of AC_DEFUN is
|
|
# deliberate.
|
|
define(AC_DEFINE_NOAUTOHEADER,
|
|
[cat >> confdefs.h <<\EOF
|
|
[#define] $1 ifelse($#, 2, [$2], $#, 3, [$2], 1)
|
|
EOF
|
|
])
|
|
|
|
# We always want a C version of alloca() compiled into libiberty,
|
|
# because native-compiler support for the real alloca is so !@#$%
|
|
# 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])
|
|
])
|