dir.c: use self-made IFTODT in rb_pathtype_t if available
dir.c defines IFTODT if the system doesn't have it. The macro is used when comparing with rb_pathtype_t's cases. rb_pathtype_t's cases are defined by DT_XXX macro if they are available, or defined using IFTODT. Most POSIX-compatible platforms have both IFTODT and DT_XXX and most of other platforms like MinGW have neither of them. On those platforms, DT_XXX-oriented rb_pathtype_t is always compared with values converted by system's IFTODT, and emulated-IFTODT-oriented rb_pathtype_t is always compared with values converted by emulated-IFTODT.
However, when IFTODT is not defined and DT_XXX is defined, like on wasi-libc, DT_XXX-oriented rb_pathtype_t was compared with values converted by emulated-IFTODT, and they are not guaranteed to be compatible.
This patch fixes such a situation by using emulated-IFTODT to define rb_pathtype_t when either IFTODT or DT_XXX is not available.
Added by katei (Yuta Saito) over 3 years ago
dir.c: use self-made IFTODT in rb_pathtype_t if available
dir.c defines IFTODT if the system doesn't have it. The macro is used
when comparing with rb_pathtype_t's cases. rb_pathtype_t's cases are
defined by DT_XXX macro if they are available, or defined using IFTODT.
Most POSIX-compatible platforms have both IFTODT and DT_XXX and most of
other platforms like MinGW have neither of them. On those platforms,
DT_XXX-oriented rb_pathtype_t is always compared with values converted
by system's IFTODT, and emulated-IFTODT-oriented rb_pathtype_t is always
compared with values converted by emulated-IFTODT.
However, when IFTODT is not defined and DT_XXX is defined, like
on wasi-libc, DT_XXX-oriented rb_pathtype_t was compared with values
converted by emulated-IFTODT, and they are not guaranteed to be
compatible.
This patch fixes such a situation by using emulated-IFTODT to define
rb_pathtype_t when either IFTODT or DT_XXX is not available.