The following invalid code snippet triggers an ICE since GCC 4.2.0 when compiled with -fopenmp:
=========================================================== template<int> void foo() { #pragma omp parallel for for (int& i = 0; i < 10; ++i) ; } =========================================================== bug.cc: In function 'void foo()': bug.cc:5: internal compiler error: in build_modify_expr, at cp/typeck.c:5809 Please submit a full bug report, [etc.] Without templates the situation is not much better: =========================================================== void foo() { int j = 0; #pragma omp parallel for for (int& i = j; i < 10; ++i) ; } =========================================================== bug.cc: In function 'void foo()': bug.cc:6: error: 'i' declared as reference but not initialized bug.cc:7: internal compiler error: in build_modify_expr, at cp/typeck.c:5809 Please submit a full bug report, [etc.] The compiler issues a bogus error message (the variable is initialized), and crashes afterwards. -- Summary: ICE with reference in parallel for loop Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: ice-on-invalid-code, diagnostic, monitored, openmp Severity: normal Priority: P3 Component: c++ 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=35078