https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99990
Bug ID: 99990 Summary: Crash in GCC-11/gimplify Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: k.even-mendoza at imperial dot ac.uk Target Milestone: --- In Ubuntu 18, with GCC-11 (gcc (GCC) 11.0.1 20210317 (experimental)), when trying to compile this code: #include <stdarg.h> void a() { va_arg(0, long); void *b[] = 0; } GCC-11 crashed with this error: === /home/user42/data/gcc-csmith-0/gcc-install/bin/gcc 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c In file included from 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c:1: 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c: In function ‘a’: 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c:3:13: error: first argument to ‘va_arg’ not of type ‘va_list’ 3 | va_arg(0, long); | ^~~~ 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c:4:15: error: invalid initializer 4 | void *b[] = 0; | ^ In file included from 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c:1: 934d08d3ee1bab940b2f2f2651e06ccaf8d82f87.c:3:13: internal compiler error: in gimplify_va_arg_expr, at gimplify.c:15594 3 | va_arg(0, long); | ^ 0x6b7b93 gimplify_va_arg_expr(tree_node**, gimple**, gimple**) .././../gcc-source/gcc/gimplify.c:15594 0xb8e839 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int) .././../gcc-source/gcc/gimplify.c:14156 0xb91416 gimplify_stmt(tree_node**, gimple**) .././../gcc-source/gcc/gimplify.c:6876 0xb8ecbb gimplify_statement_list .././../gcc-source/gcc/gimplify.c:1879 0xb8ecbb gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int) .././../gcc-source/gcc/gimplify.c:14526 0xb91416 gimplify_stmt(tree_node**, gimple**) .././../gcc-source/gcc/gimplify.c:6876 0xb91bd1 gimplify_bind_expr .././../gcc-source/gcc/gimplify.c:1421 0xb8e1ee gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*), int) .././../gcc-source/gcc/gimplify.c:14283 0xba776f gimplify_stmt(tree_node**, gimple**) .././../gcc-source/gcc/gimplify.c:6876 0xba776f gimplify_body(tree_node*, bool) .././../gcc-source/gcc/gimplify.c:15318 0xba7b9d gimplify_function_tree(tree_node*) .././../gcc-source/gcc/gimplify.c:15472 0x9dc057 cgraph_node::analyze() .././../gcc-source/gcc/cgraphunit.c:670 0x9debb7 analyze_functions .././../gcc-source/gcc/cgraphunit.c:1236 0x9df81d symbol_table::finalize_compilation_unit() .././../gcc-source/gcc/cgraphunit.c:2514 Please submit a full bug report, === Before (gcc-10) it would just stop the compilation (with these two errors) and exit without crashing.