Have moved status to 'Confirmed' without attaching kernel log files as I
believe these are not relevant.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Description changed:
On Ubuntu 22.04.2 LTS using fully updated gcc and gdb, I find that by
default gcc produces DWARF5 debug files which gdb cannot read, with the
following error:
Dwarf Error: DW_FORM_line_strp used without required section
If I add the flags `-gdwarf-4 -gstrict-dwarf` to `gcc` then it produces
output which gdb can read.
I would have expected the created and required versions of DWARF to
- match between these two programs.
+ match between these two programs when everything is up-to-date, within
+ the same distro.
(I found the following two issues which appear to be people also
suffering from gcc newly producing DWARF5, in different contexts:
https://github.com/golang/vscode-go/issues/1914
https://github.com/haikuports/haikuports/issues/4987 ; as mentioned
however, the mismatch between what gcc produces and what gdb accepts
seems to be a specific problem, which I suppose may be likely to break
e.g. existing working debug instructions, etc.)
---
Package: gcc
Version: 4:11.2.0-1ubuntu1
$ gcc --version
gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
Package: gdb
Version: 12.1-0ubuntu1~22.04
$ gdb --version
GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1
-
Using default gcc output (i.e. with no flags specifying DWARF version):
(gdb) add-symbol-file {...}/shimx64.efi.debug 0x0561B000 -s .data 0x05681000
add symbol table from file "{...}/shimx64.efi.debug" at
- .text_addr = 0x561b000
- .data_addr = 0x5681000
+ .text_addr = 0x561b000
+ .data_addr = 0x5681000
(y or n) y
Reading symbols from {...}/shimx64.efi.debug...
Dwarf Error: DW_FORM_line_strp used without required section
(No debugging symbols found in {...}/shimx64.efi.debug)
- (gdb)
-
+ (gdb)
After adding `-gdwarf-4 -gstrict-dwarf` to gcc compile flags:
(gdb) add-symbol-file {...}/shimx64.efi.debug 0x0561B000 -s .data 0x05681000
add symbol table from file "{...}/shimx64.efi.debug" at
- .text_addr = 0x561b000
- .data_addr = 0x5681000
+ .text_addr = 0x561b000
+ .data_addr = 0x5681000
(y or n) y
Reading symbols from {...}/shimx64.efi.debug...
(gdb)
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https://bugs.launchpad.net/bugs/2014231
Title:
gcc produces DWARF5, gdb requires DWARF4
Status in linux package in Ubuntu:
Confirmed
Bug description:
On Ubuntu 22.04.2 LTS using fully updated gcc and gdb, I find that by
default gcc produces DWARF5 debug files which gdb cannot read, with
the following error:
Dwarf Error: DW_FORM_line_strp used without required section
If I add the flags `-gdwarf-4 -gstrict-dwarf` to `gcc` then it
produces output which gdb can read.
I would have expected the created and required versions of DWARF to
match between these two programs when everything is up-to-date, within
the same distro.
(I found the following two issues which appear to be people also
suffering from gcc newly producing DWARF5, in different contexts:
https://github.com/golang/vscode-go/issues/1914
https://github.com/haikuports/haikuports/issues/4987 ; as mentioned
however, the mismatch between what gcc produces and what gdb accepts
seems to be a specific problem, which I suppose may be likely to break
e.g. existing working debug instructions, etc.)
---
Package: gcc
Version: 4:11.2.0-1ubuntu1
$ gcc --version
gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
Package: gdb
Version: 12.1-0ubuntu1~22.04
$ gdb --version
GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1
Using default gcc output (i.e. with no flags specifying DWARF
version):
(gdb) add-symbol-file {...}/shimx64.efi.debug 0x0561B000 -s .data 0x05681000
add symbol table from file "{...}/shimx64.efi.debug" at
.text_addr = 0x561b000
.data_addr = 0x5681000
(y or n) y
Reading symbols from {...}/shimx64.efi.debug...
Dwarf Error: DW_FORM_line_strp used without required section
(No debugging symbols found in {...}/shimx64.efi.debug)
(gdb)
After adding `-gdwarf-4 -gstrict-dwarf` to gcc compile flags:
(gdb) add-symbol-file {...}/shimx64.efi.debug 0x0561B000 -s .data 0x05681000
add symbol table from file "{...}/shimx64.efi.debug" at
.text_addr = 0x561b000
.data_addr = 0x5681000
(y or n) y
Reading symbols from {...}/shimx64.efi.debug...
(gdb)
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