ReadDirAt returned 0 (empty listing) for paths that do not exist at
all, so the libc's stat()/access() - which probe directory-ness via
SYS_READDIR - reported every nonexistent path as an existing
directory. Harmless for two years of callers, fatal for GCC's driver:
it access()-tests the optional specs file, got a false positive for
0:/sdk/lib/gcc/x86_64-montauk/14.2.0/specs, then died failing to read
it.
A path now has to have a directory entry or at least one child to
list as a directory; everything else returns -1. Real empty
directories (tar dir entries, runtime Mkdir) still list as empty.
Co-Authored-By: Claude Fable 5 <[email protected]>
danielandClaude Fable 5
3938530508