The following valid code snippet triggers an ICE on mainline when compiled with "-fmudflap -O -g":
================== struct A { A(); }; void foo() { while (true) A a; } ================== bug.cc: In function 'void foo()': bug.cc:10: internal compiler error: tree check: expected block, have function_decl in change_scope, at cfglayout.c:420 Please submit a full bug report, [etc.] This is a recent regression, introduced between 2008-09-29 and 2008-10-08. -- Summary: [4.4 regression] ICE with variable declaration in loop and -fmudflap Product: gcc Version: 4.4.0 Status: UNCONFIRMED Keywords: ice-on-valid-code, monitored Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: reichelt at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37788