dnl checks for Unix variants
AC_AIX
+
#### Extract some information from the operating system and machine files.
AC_CHECKING([the machine- and system-dependent files to find out
[Define as `void' if your compiler accepts `void *'; otherwise
define as `char'.])dnl
+dnl Test if heap start address is randomized (exec-shield does this).
+dnl The test program requires unistd.h and stdlib.h. They are present
+dnl on the systems that currently have exec-shield.
+AC_MSG_CHECKING(whether heap start address is randomized)
+if test x"$ac_cv_header_unistd_h" != x && test x"$ac_cv_header_stdlib_h" != x
+then
+ AC_TRY_RUN([#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+int main (int argc, char *argv[])
+{
+ unsigned long old_sbrk = 0;
+ unsigned long this_sbrk = (unsigned long) sbrk(0);
+ int nr = 1;
+ if (argc != 1) {
+ old_sbrk = strtoul (argv[1], 0, 0);
+ nr = atoi (argv[2])+1;
+ }
+ if (argc == 1 || (old_sbrk == this_sbrk && nr < 3))
+ {
+ char buf1[32], buf2[32];
+ sprintf (buf1, "%lu", this_sbrk);
+ sprintf (buf2, "%d", nr);
+ execl (argv[0], argv[0], buf1, buf2, 0);
+ exit (-1);
+ }
+ exit (this_sbrk == old_sbrk);
+}], emacs_cv_randomheap=yes, emacs_cv_randomheap=no,
+ emacs_cv_randomheap='assuming no')
+else
+ emacs_cv_randomheap='assuming no'
+fi
+AC_MSG_RESULT($emacs_cv_randomheap)
+
+if test "$emacs_cv_randomheap" = yes; then
+ AC_PATH_PROG(SETARCH, setarch, no)
+ AC_SUBST(SETARCH)
+ if test "$SETARCH" != no && test "$machine" = "intel386"; then
+ AC_DEFINE(HAVE_RANDOM_HEAPSTART, 1,
+ [Define to 1 if this OS randomizes the start address of the heap.])
+ else
+ dnl We do the warning at the end of the configure run so it is seen.
+ emacs_cv_randomheap=warn
+ fi
+fi
+
+
dnl This could be used for targets which can have both byte sexes.
dnl We could presumably replace the hardwired WORDS_BIG_ENDIAN generally.
dnl AC_C_BIGENDIAN
AC_CHECK_HEADER(Carbon/Carbon.h, HAVE_CARBON=yes)
fi
+dnl Check for malloc/malloc.h on darwin
+AC_CHECK_HEADER(malloc/malloc.h, AC_DEFINE(HAVE_MALLOC_MALLOC_H, 1, [Define to 1 if you have the <malloc/malloc.h> header file.]))
+
if test "${HAVE_CARBON}" = "yes"; then
AC_DEFINE(HAVE_CARBON, 1, [Define to 1 if you are using the Carbon API on Mac OS X.])
window_system=mac
__fpending mblen mbrlen mbsinit strsignal setitimer ualarm index rindex \
sendto recvfrom getsockopt setsockopt getsockname getpeername \
gai_strerror mkstemp getline getdelim mremap memmove fsync bzero \
-memset memcmp memmove difftime memcpy mempcpy mblen mbrlen posix_memalign)
+memset memcmp difftime memcpy mempcpy mblen mbrlen posix_memalign)
AC_CHECK_HEADERS(sys/un.h)
echo " Does Emacs use X toolkit scroll bars? ${USE_TOOLKIT_SCROLL_BARS}"
echo
+if test "$emacs_cv_randomheap" = warn; then
+ AC_MSG_WARN([
+**********************************************************************
+
+Heap start address is randomized and no workaround is known.
+Emacs will probably dump core when temacs is run in the build phase.
+Maybe exec-shield is turned on. Read about exec-shield in `etc/PROBLEMS'
+for further information.
+
+**********************************************************************
+])
+fi
+
# Remove any trailing slashes in these variables.
[test "${prefix}" != NONE &&
prefix=`echo "${prefix}" | sed 's,\([^/]\)/*$,\1,'`