https://sourceware.org/bugzilla/show_bug.cgi?id=31111
Bug ID: 31111
Summary: Handle Clang DWARF 5 DW_AT_decl_file 0
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libdw
Assignee: unassigned at sourceware dot org
Reporter: gprocida at google dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
There is an ambiguity in DWARF 5 noted and resolved for DWARF 6 in
https://dwarfstd.org/issues/210713.1.html.
Clang's treatment of this in DWARF 5 is as if it were DWARF 6, rather than
following the letter of the standard (and having to create and use an extra
file entry). See: https://github.com/llvm/llvm-project/issues/74097
Incidentally, following that change, the only sensible way to represent "no
source file" (for builtins like __va_list) is perhaps by omitting the attribute
altogether. (Clang and GCC treat __va_list and its members rather
inconsistently.)
For the record here, clang -gdwarf-5 populates the file table index 0 as per
DWARF 5, section 6.2.4 *and uses it in declarations*. However, elfutils
dwarf_decl_file detects index 0 specially and does not examine the file table
entry, reporting, "no file".
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