[Bug debug/97441] New: gcc writes absolute path to .stabstr section when fdebug-prefix-map is used

[Bug debug/97441] New: gcc writes absolute path to .stabstr section when fdebug-prefix-map is used

[dzagorui at cisco dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97441

            Bug ID: 97441
           Summary: gcc writes absolute path to .stabstr section when
                    fdebug-prefix-map is used
           Product: gcc
           Version: 10.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dzagorui at cisco dot com
  Target Milestone: ---

Created attachment 49378
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49378&action=edit
asm file after preprocessing

For 32 bit Powerpc Linux Kernel .stabs pseudo asm op is used
https://elixir.bootlin.com/linux/latest/source/arch/powerpc/include/asm/ppc_asm.h#L248

During out of source kernel build
(https://elixir.bootlin.com/linux/latest/source/scripts/mkmakefile) gcc writes
absolute path to first .stab even when -fdebug-prefix-map flag is used.
Provided one compiled asm object
(https://elixir.bootlin.com/linux/latest/source/arch/powerpc/kernel/fpu.S)
as an example. In this example -fdebug-prefix-map remaps only dwarf sections
but doesn't affect .stabstr.

$ powerpc-linux-gnu-gcc -m32 -nostdinc -mbig-endian -Wa,-gdwarf-2
-fdebug-prefix-map=/home/dzagorui/repro/powerpc=/usr/src -c -o fpu.o fpu.s

$ objdump -s fpu.o

Contents of section .stab:
 0000 00000001 00000006 00000097 0000003f  ...............?
 0010 24000000 00000000 00000051 24000000  $..........Q$...
 0020 00000000 00000064 24000000 00000000  .......d$.......
 0030 00000074 24000000 00000000 00000081  ...t$...........
 0040 24000000 00000000 0000008c 24000000  $...........$...
 0050 00000000                             ....            
Contents of section .stabstr:
 0000 002f686f 6d652f64 7a61676f 7275692f  ./home/dzagorui/
 0010 72657072 6f2f706f 77657270 632f6b65  repro/powerpc/ke
 0020 726e656c 2f617263 682f706f 77657270  rnel/arch/powerp
 0030 632f6b65 726e656c 2f667075 2e53006c  c/kernel/fpu.S.l
 0040 6f61645f 66705f73 74617465 3a462d31  oad_fp_state:F-1
 0050 0073746f 72655f66 705f7374 6174653a  .store_fp_state:
 0060 462d3100 6c6f6164 5f75705f 6670753a  F-1.load_up_fpu:
 0070 462d3100 73617665 5f667075 3a462d31  F-1.save_fpu:F-1
 0080 00637674 5f66643a 462d3100 6376745f  .cvt_fd:F-1.cvt_
 0090 64663a46 2d3100                      df:F-1.         
Contents of section ___ksymtab+load_fp_state:
 0000 00000000 00000000                    ........        
Contents of section __ksymtab_strings:
 0000 6c6f6164 5f66705f 73746174 65007374  load_fp_state.st
 0010 6f72655f 66705f73 74617465 00        ore_fp_state.   
Contents of section ___kcrctab+load_fp_state:
 0000 00000000                             ....            
Contents of section ___ksymtab+store_fp_state:
 0000 00000000 00000000                    ........        
Contents of section ___kcrctab+store_fp_state:
 0000 00000000                             ....            
Contents of section .debug_line:
 0000 00000084 00020000 00400401 fb0e0d00  .........@......
 0010 01010101 00000001 0000012f 7573722f  .........../usr/
 0020 7372632f 6b65726e 656c2f61 7263682f  src/kernel/arch/
 0030 706f7765 7270632f 6b65726e 656c0000  powerpc/kernel..
 0040 6670752e 53000100 00000005 02000000  fpu.S...........
 0050 00033a01 212108e5 2808e521 21030d20  ..:.!!..(..!!.. 
 0060 21272123 21212103 0a202121 21212121  !'!#!!!.. !!!!!!
 0070 08e72821 21212121 2108e521 21282121  ..(!!!!!!..!!(!!
 0080 23212102 01000101                    #!!.....        
Contents of section .debug_info:
 0000 00000022 00020000 00000401 00000000  ..."............
 0010 00000000 00000000 00000000 00000000  ................
 0020 00000000 8001                        ......          
Contents of section .debug_abbrev:
 0000 01110010 06110112 01030e1b 0e250e13  .............%..
 0010 05000000                             ....            
Contents of section .debug_aranges:
 0000 0000001c 00020000 00000400 00000000  ................
 0010 00000000 00000290 00000000 00000000  ................
Contents of section .debug_str:
 0000 2f757372 2f737263 2f6b6572 6e656c2f  /usr/src/kernel/
 0010 61726368 2f706f77 65727063 2f6b6572  arch/powerpc/ker
 0020 6e656c2f 6670752e 53002f68 6f6d652f  nel/fpu.S./home/
 0030 647a6167 6f727569 2f726570 726f2f74  dzagorui/repro/t
 0040 6d700047 4e552041 5320322e 33312e31  mp.GNU AS 2.31.1
 0050 00

[Bug debug/97441] gcc writes absolute path to .stabstr section even if fdebug-prefix-map is used

[dzagorui at cisco dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97441

Denys Zahorui <dzagorui at cisco dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Denys Zahorui <dzagorui at cisco dot com> ---
This is assembler util (binutils) related issue.
Fixed there
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=0541201782c006c09d029d18a45c6e743cfea906