Hi!
As mentioned in the PR, with -E (C family and Fortran FEs, others don't
preprocess) ask the middle-end not to initialize the backends, so running
e.g. RTL tests leads to ICEs, e.g. pc_rtx and many other things just aren't
initialized.
2016-06-20 Jakub Jelinek <ja...@redhat.com>
PR rtl-optimization/71591
* toplev.c (toplev::run_self_tests): If no_backend, complain and
don't run any tests.
* gcc.dg/cpp/pr71591.c: New test.
--- gcc/toplev.c.jj 2016-06-13 20:45:11.000000000 +0200
+++ gcc/toplev.c 2016-06-20 14:54:07.931667136 +0200
@@ -2047,6 +2047,11 @@ toplev::start_timevars ()
void
toplev::run_self_tests ()
{
+ if (no_backend)
+ {
+ error_at (UNKNOWN_LOCATION, "self-tests incompatible with -E");
+ return;
+ }
#if CHECKING_P
/* Reset some state. */
input_location = UNKNOWN_LOCATION;
--- gcc/testsuite/gcc.dg/cpp/pr71591.c.jj 2016-06-20 14:57:19.713187492
+0200
+++ gcc/testsuite/gcc.dg/cpp/pr71591.c 2016-06-20 14:58:46.014071662 +0200
@@ -0,0 +1,5 @@
+/* PR rtl-optimization/71591 */
+/* { dg-do preprocess } */
+/* { dg-options "-fself-test" } */
+
+/* { dg-message "self-tests incompatible with -E" "" { target *-*-* } 0 } */
Jakub
