[llvm-bugs] [Bug 38050] -fdebug-prefix-map is a no-op for .S files

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jul 10 16:22:47 PDT 2018


Dan McGregor <dan.mcgregor at usask.ca> changed:

           What    |Removed                     |Added
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---
                 CC|                            |dan.mcgregor at usask.ca

--- Comment #5 from Dan McGregor <dan.mcgregor at usask.ca> ---
This *nearly* fixes the issue. It doesn't handle the case where the full path
to the assembly file is specified on the command line. This is after the code
was committed:

$ clang-7 -g -c -o hello.o $PWD/hello.c -fdebug-prefix-map=$PWD=/src_root
$ strings hello.o|grep $PWD

$ clang-7 -g -c -o crti.o $PWD/crti.S -fdebug-prefix-map=$PWD=/src_root
$ strings crti.o|grep $PWD

The compilation directory is changed correctly and the DW_TAG_label values are
correct, but not DW_TAG_compile_unit:

$ llvm-dwarfdump crti.o
crti.o: file format ELF64-x86-64

.debug_info contents:
0x00000000: Compile Unit: length = 0x00000119 version = 0x0002 abbr_offset =
0x0000 addr_size = 0x08 (next unit at 0x0000011d)

0x0000000b: DW_TAG_compile_unit
              DW_AT_stmt_list   (0x00000000)
              DW_AT_low_pc      (0x0000000000000000)
              DW_AT_high_pc     (0x0000000000000004)
              DW_AT_name        ("/tmp/test/crti.S")
              DW_AT_comp_dir    ("/src_root")
              DW_AT_producer    ("clang version 7.0.0 (based on LLVM 7.0.0)")
              DW_AT_language    (DW_LANG_Mips_Assembler)

0x000000ea:   DW_TAG_label
                DW_AT_name      ("init")
                DW_AT_decl_file ("/src_root/crti.S")
                DW_AT_decl_line (16)
                DW_AT_low_pc    (0x0000000000000000)
                DW_AT_prototyped        (0x00)

0x00000101:     DW_TAG_unspecified_parameters

0x00000102:     NULL

0x00000103:   DW_TAG_label
                DW_AT_name      ("fini")
                DW_AT_decl_file ("/src_root/crti.S")
                DW_AT_decl_line (23)
                DW_AT_low_pc    (0x0000000000000000)
                DW_AT_prototyped        (0x00)

0x0000011a:     DW_TAG_unspecified_parameters

0x0000011b:     NULL

0x0000011c:   NULL

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