Old stuff, affects versions down to r6 :


$ cat z1.c
void f ()
{
  #line 9223372036854775807
  g ()
  + 1;
}


$ gcc-11-20201213 -c z1.c -Wall
z1.c: In function 'f':
z1.c:3:9: warning: line number out of range
    3 |   #line 9223372036854775807
      |         ^~~~~~~~~~~~~~~~~~~
z1.c:-1:3: warning: implicit declaration of function 'g' [-Wimplicit-function-declaration]
z1.c: warning: value computed is not used [-Wunused-value]

z1.c: internal compiler error: in calculate_line_spans, at diagnostic-show-locus.c:1296
0x1532394 calculate_line_spans
        ../../gcc/diagnostic-show-locus.c:1296
0x1532394 layout
        ../../gcc/diagnostic-show-locus.c:1003
0x1532572 diagnostic_show_locus(diagnostic_context*, rich_location*, diagnostic_t)
        ../../gcc/diagnostic-show-locus.c:2601
0x6e2435 c_diagnostic_finalizer
        ../../gcc/c-family/c-opts.c:174
0x152d744 diagnostic_report_diagnostic(diagnostic_context*, diagnostic_info*)
        ../../gcc/diagnostic.c:1223
0x152de6e diagnostic_impl
        ../../gcc/diagnostic.c:1366
0x152e392 warning_at(unsigned int, int, char const*, ...)
        ../../gcc/diagnostic.c:1503
0x64ea89 c_process_expr_stmt(unsigned int, tree_node*)
        ../../gcc/c/c-typeck.c:11213
0x64eb8d c_finish_expr_stmt(unsigned int, tree_node*)
        ../../gcc/c/c-typeck.c:11243
0x689d18 c_parser_statement_after_labels
        ../../gcc/c/c-parser.c:6249
0x68bd0a c_parser_compound_statement_nostart
        ../../gcc/c/c-parser.c:5788
0x68c583 c_parser_compound_statement
        ../../gcc/c/c-parser.c:5597
0x68de38 c_parser_declaration_or_fndef
        ../../gcc/c/c-parser.c:2539
0x694ca7 c_parser_external_declaration
        ../../gcc/c/c-parser.c:1777
0x6957c9 c_parser_translation_unit
        ../../gcc/c/c-parser.c:1650
0x6957c9 c_parse_file()
        ../../gcc/c/c-parser.c:21929
0x6e5532 c_common_parse_file()
        ../../gcc/c-family/c-opts.c:1211