X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=autoconf%2Fconfigure.ac;h=4e4200be5bdd81e8116656062da68d7c91ebadef;hb=e644ef7b098460ce831220c780cbe25eaef3fb28;hp=9b2234103d0eaa8b50049be5dfd02f32e87e8ec5;hpb=5c9f800bde076753706ea91fe7e39a2e302c31f7;p=oota-llvm.git

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 9b2234103d0..4e4200be5bd 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -274,6 +274,17 @@ else
   AC_SUBST(DISABLE_ASSERTIONS,[[DISABLE_ASSERTIONS=1]])
 fi
 
+dnl --enable-expensive-checks : check whether they want to turn on expensive debug checks:
+AC_ARG_ENABLE(expensive-checks,AS_HELP_STRING(
+  [--enable-expensive-checks,Compile with expensive debug checks enabled (default is NO)]),, enableval="no")
+if test ${enableval} = "yes" ; then
+  AC_SUBST(ENABLE_EXPENSIVE_CHECKS,[[ENABLE_EXPENSIVE_CHECKS=1]])
+  AC_SUBST(EXPENSIVE_CHECKS,[[yes]])
+else
+  AC_SUBST(ENABLE_EXPENSIVE_CHECKS,[[]])
+  AC_SUBST(EXPENSIVE_CHECKS,[[no]])
+fi
+
 dnl --enable-debug-runtime : should runtime libraries have debug symbols?
 AC_ARG_ENABLE(debug-runtime,
    AS_HELP_STRING([--enable-debug-runtime,Build runtime libs with debug symbols (default is NO)]),,enableval=no)
@@ -495,6 +506,7 @@ LLVM_PROG_PERL([5.006])
 AC_SUBST(PERL)
 if test x"$PERL" = xnone; then
    AC_SUBST(HAVE_PERL,0)
+   AC_MSG_ERROR([perl is required but was not found, please install it])
 else
    AC_SUBST(HAVE_PERL,1)
 fi