Try and automatically detect pure 64 bit systems with no 32 bit support.
git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5966 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/configure.in b/configure.in
index 2edd6f7..d342e09 100644
--- a/configure.in
+++ b/configure.in
@@ -238,6 +238,31 @@
;;
esac
+# If we are building on a 64 bit platform test to see if the system
+# supports building 32 bit programs and disable 32 bit support if it
+# does not support building 32 bit programs
+
+case "$VG_ARCH-$VG_OS" in
+ amd64-linux|ppc64-linux)
+ AC_MSG_CHECKING([for 32 bit build support])
+ safe_CFLAGS=$CFLAGS
+ CFLAGS="-m32"
+ AC_TRY_LINK(, [
+ int main () { return 0 ; }
+ ],
+ [
+ AC_MSG_RESULT([yes])
+ ], [
+ vg_cv_only64bit="yes"
+ AC_MSG_RESULT([no])
+ ])
+ CFLAGS=$safe_CFLAGS;;
+esac
+
+if test x$vg_cv_only64bit = xyes -a x$vg_cv_only32bit = xyes; then
+ AC_MSG_ERROR(
+ [--enable-only32bit was specified but system does not support 32 bit builds])
+fi
# Establish VG_PLATFORM_PRI. This is the primary build target. The
# entire system, including regression and performance tests, will be