2ec660b2ea
The C standard does not specify whether the underlying type of an enum
is signed or unsigned, and until C23 there was no way to control this
explicitly. GCC appears to make enums unsigned unless there is a
negative value among cases of the enum, in which case it becomes signed.
MSCV appears to make enums signed by default.
A bitfield of an enum type (which is not specificied in the C standard
either) behaves as if it was an instance of a numeric type with a
reduced value range. Specifically, a 'signed int val : 2;' bitfield will
have the possible values of -2, -1, 0, and 1, with the usual wraparound
behavior for the values that don't fit (although this too is
implementation-defined).
This causes the following issue, if we have:
typedef enum
{
G_ZERO,
G_ONE,
G_TWO
} GFoo;
struct _GBar
{
GFoo foo : 2;
};
and then assign bar.foo = G_TWO and read it back, it will have the
expected value of 2 (aka G_TWO) on GCC, but a value of -2 (not matching
any of the enum variants) on MSVC.
There does not seem to be any way to influence signedness of an enum
prior to C23, nor is there a 'unsigned GFoo foo : 2;' syntax. The only
remaining options seems to be never using enums in bitfields, which is
what this change implements.
This corresponds to https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/6467
in GTK.
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
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|---|---|---|
| .gitlab-ci | ||
| .reuse | ||
| docs | ||
| fuzzing | ||
| gio | ||
| glib | ||
| gmodule | ||
| gobject | ||
| gthread | ||
| LICENSES | ||
| m4macros | ||
| po | ||
| subprojects | ||
| tests | ||
| tools | ||
| .clang-format | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .gitmodules | ||
| .lcovrc | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| COPYING | ||
| glib.doap | ||
| INSTALL.md | ||
| meson_options.txt | ||
| meson.build | ||
| NEWS | ||
| README.md | ||
| SECURITY.md | ||
GLib
GLib is the low-level core library that forms the basis for projects such as GTK and GNOME. It provides data structure handling for C, portability wrappers, and interfaces for such runtime functionality as an event loop, threads, dynamic loading, and an object system.
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