https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105088
Bug ID: 105088
Summary: Small DWARF 5 spec violation in line table when
passing an absolute path
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: simon.marchi at polymtl dot ca
Target Milestone: ---
With:
$ gcc --version
gcc (GCC) 11.2.0
$ as --version
GNU assembler (GNU Binutils) 2.38
I have a source file at /tmp/cwd/test.c and compile it with:
$ gcc /tmp/cwd/test.c -g3 -O0 -gdwarf-5
The DW_AT_name of the CU is "/tmp/cwd/test.c":
<12> DW_AT_name : (line_strp) (offset: 0xd): /tmp/cwd/test.c
The entry at index 0 in the file names table, in the line table header, is
"test.c":
0 (udata) 1 (line_strp) (offset: 0x16): test.c
In section 6.2.4 (The Line Number Program Header), bullet 20 (file_names),
DWARF5.pdf says:
> The first entry in the sequence is the primary source file whose file name
exactly matches that given in the DW_AT_name attribute in the compilation
unit debugging information entry.
The debug info produced by the toolchain therefore seems to not respect the
spec: the name of the primary source file in the line table header ("test.c")
does not match the DW_AT_name attribute in the compilation unit DIE
("/tmp/cwd/test.c").
