Replaces: https://github.com/ghostty-org/ghostty/pull/13427
Zig's Mach-O linker does not emit LC_ENCRYPTION_INFO_64 for physical
iOS dylibs. This allows libghostty-vt to build successfully but causes
frameworks containing it to fail App Store validation.
I think it'd be cleaner to always just build Apple targets on Apple hosts
with the native linker. We don't need to rely on Zig being correct and
this helps ensure compatibility for details like this.
Xcode 27's math.h uses the __need_infinity_nan protocol provided by
matching Clang resource headers. Zig 0.16's bundled float.h predates
that protocol, causing the bundled libc++ compilation to fail.
Overlay the SDK math.h through the Apple SDK libc include path and
provide the missing infinity and NaN definitions. The compatibility
header can be removed once Zig's bundled Clang headers support the
protocol.
#13417
The bundled upstream libc++ headers in Zig 0.16 skip the Apple-configured
availability setting. This causes the headers to assume every LLVM 21
ABI symbol is present in the target system libc++, producing binaries
that fail at launch on macOS versions without `std::__hash_memory`.
Enable the Apple vendor availability table for compile steps configured
by the Apple SDK helper. libc++ now selects its inline compatibility
implementation when the target system dylib does not provide the symbol.
References in the mega comment
This commit represents the majority of the work necessary to upgrade
Ghostty to use Zig 0.16.0.
Key parts:
* In addition to its previous responsibilities, the global state now
houses state for global I/O implementations and the process
environment. It is now also utilized in the main application along
with the C library. Where necessary, global state is isolated from key
parts of the implementation (e.g., in libghostty subsystems), and it's
expected that this list will grow.
* We currently manage our own C translation layer where necessary. In
these cases, cImport has been removed in favor of the new external
translate-c package. Due to fixes that have needed be made to properly
translate the dependencies that were swapped out, as mentioned, we
have had to backport fixes from the current translate-c package (and
the upstream Arocc dependency). We will host this ourselves until Zig
0.17.0 is released with these fixes.
* Where necessary (only a small number of cases), some stdlib code from
0.15.2 (and even from 0.17.0) has been taken, adopted, and vendored in
lib/compat.
Co-authored-by: Leah Amelia Chen <hi@pluie.me>
Currently, cross to Darwin uses the Darwin headers bundled with Zig.
However, if you're running a build _on_ Darwin, an error is thrown if
the SDK can't be found, even though the bundled headers are still
available.
Now, we continue to search for and prefer the installed SDK, but if it
can't be found, we fall back to the bundled headers rather than failing
the build.
This allows libghostty-vt to be cross-compiled for macOS from non-macOS
platforms. I've updated pkg/apple-sdk to fallback to Zig's embedded
macOS headers if the macOS SDK is not found.
Additionally, CombineArchivesStep has been updated to use Linux
tooling on Linux.
This fixes an issue where Ghostty would not build against the macOS 15.5 SDK.
What was happening was that Zig was adding its embedded libc paths to
the clang command line, which included old headers that were
incompatible with the latest (macOS 15.5) SDK. Ghostty was adding the
newer paths but they were being overridden by the embedded libc paths.
The reason this was happening is because Zig was using its own logic to
find the libc paths and this was colliding with the paths we were
setting manually. To fix this, we now use a `libc.txt` file that
explicitly tells Zig where to find libc, and we base this on our own SDK
search logic.
This gets `zig build -Dtarget=aarch64-ios` working. By "working" I mean
it produces an object file without compiler errors. However, the object
file certainly isn't useful since it uses a number of features that will
not work in the iOS sandbox.
This is just an experiment more than anything to see how hard it would be to
get libghostty working within iOS to render a terminal. Note iOS doesn't
support ptys so this wouldn't be a true on-device terminal. The
challenge right now is to just get a terminal rendering (not usable).
