https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109805
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, streaming of the CWD is prone to breakage when it changes between
preprocessing and compilation stage. I think at least for C family languages
the CWD would need to be recorded by the preprocessor and made available
via line directives somehow?
This also seems "wrong" without LTO.
> ls t.c tmp
t.c
tmp:
t.h t.o
> gcc -E t.c -o t.i
> cd tmp
> gcc ../t.i -g .c
> readelf -w t.o
...
<0><b>: Abbrev Number: 1 (DW_TAG_compile_unit)
<c> DW_AT_producer : (indirect string, offset: 0x0): GNU C17 12.2.1
20220830 [revision e927d1cf141f221c5a32574bde0913307e140984] -mtune=generic
-march=x86-64 -g
<10> DW_AT_language : 12 (ANSI C99)
<11> DW_AT_name : t.c
<15> DW_AT_comp_dir : (indirect string, offset: 0x71): /tmp/tmp
...
The Directory Table (offset 0x1c):
1 tmp
The File Name Table (offset 0x21):
Entry Dir Time Size Name
1 0 0 0 t.c
2 1 0 0 t.h
and LTO just adds another level of "directory changing" (but for sure a more
common one).
