http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59627
Bug ID: 59627 Summary: ICE with OpenMP "declare reduction" and -flto Product: gcc Version: 4.9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: reichelt at gcc dot gnu.org The following valid code snippet (compiled with "-fopenmp -flto") triggers an ICE on trunk since 2013-10-11: ============================================================== struct A { int i; }; void foo() { A a; #pragma omp declare reduction (+: A: omp_out.i += omp_in.i) #pragma omp parallel reduction (+: a) ; } ============================================================== bug.cc:6:11: internal compiler error: in discriminator_for_local_entity, at cp/mangle.c:1745 #pragma omp declare reduction (+: A: omp_out.i += omp_in.i) ^ 0x73a658 discriminator_for_local_entity ../../gcc/gcc/cp/mangle.c:1745 0x73a658 write_local_name ../../gcc/gcc/cp/mangle.c:1833 0x73a658 write_name ../../gcc/gcc/cp/mangle.c:847 0x73a92b write_encoding ../../gcc/gcc/cp/mangle.c:714 0x743398 mangle_decl_string ../../gcc/gcc/cp/mangle.c:3433 0x743577 get_mangled_id ../../gcc/gcc/cp/mangle.c:3455 0x743577 mangle_decl(tree_node*) ../../gcc/gcc/cp/mangle.c:3478 0xd91200 decl_assembler_name(tree_node*) ../../gcc/gcc/tree.c:600 0xd92c46 assign_assembler_name_if_neeeded(tree_node*) ../../gcc/gcc/tree.c:5505 0xdacf2e free_lang_data_in_cgraph ../../gcc/gcc/tree.c:5560 0xdacf2e free_lang_data ../../gcc/gcc/tree.c:5597 0xdacf2e execute ../../gcc/gcc/tree.c:5646 Please submit a full bug report, [etc.] Jakub, this appeared right after your big OpenMP 4.0 patch (where "omp declare reduction" was introduced): 2013-10-11 Jakub Jelinek <ja...@redhat.com> * decl.c (duplicate_decls): Error out for redeclaration of UDRs. (declare_simd_adjust_this): New function. (grokfndecl): If "omp declare simd" attribute is present, call declare_simd_adjust_this if needed and c_omp_declare_simd_clauses_to_numbers. [...] Would you mind having a look?