b83604c75f
PR debug/98751 reports an issue in which most of libgccjit's tests fails in DWARF 5 handling with `.Ldebug_loc2' is already defined" asm errors. The bogus label is being emitted at the 3rd in-process iteration, at: 31673 ASM_OUTPUT_LABEL (asm_out_file, loc_section_label); which on the initial iteration emits: 145 │ .Ldebug_loc0: on the 2nd iteration: 145 │ .Ldebug_loc1: and on the 3rd iteration: 145 │ .Ldebug_loc2: which is a duplicate of a label emitted earlier: 138 │ .section .debug_loclists,"",@progbits 139 │ .long .Ldebug_loc3-.Ldebug_loc2 140 │ .Ldebug_loc2: 141 │ .value 0x5 142 │ .byte 0x8 143 │ .byte 0 144 │ .long 0 145 │ .Ldebug_loc2: The issue seems to be that init_sections_and_labels creates the label ASM_GENERATE_INTERNAL_LABEL (loc_section_label, DEBUG_LOC_SECTION_LABEL, generation); where "generation" is a static local to init_sections_and_labels that increments, and thus eventually hits the duplicate value. It appears that this value is intended to be either 0 or 1, but in the libgccjit case the compilation code can be invoked an arbitrary number of times in-process, and hence can eventually lead to a label name collision. This patch adds code to dwarf2out_c_finalize (called by toplev::finalize in libgccjit) to reset the generation counts, fixing the issue. gcc/ChangeLog: PR debug/98751 * dwarf2out.c (output_line_info): Rename static variable "generation", moving it out of the function to... (output_line_info_generation): New. (init_sections_and_labels): Likewise, renaming the variable to... (init_sections_and_labels_generation): New. (dwarf2out_c_finalize): Reset the new variables. |
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