8000 Disable flag_enum import for GIR enumerations (GLib 2.88) by vivekgalatage · Pull Request #10 · rhx/SwiftGLib · GitHub
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Disable flag_enum import for GIR enumerations (GLib 2.88) - #10

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vivekgalatage:main
Oct 7, 2026
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Disable flag_enum import for GIR enumerations (GLib 2.88)#10
rhx merged 1 commit into
rhx:mainfrom
vivekgalatage:main

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@vivekgalatage
@vivekgalatage vivekgalatage commented Oct 3, 2026
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Fix GIO build with GLib 2.88 (G_GNUC_FLAG_ENUM)

Problem

GLib 2.88 added G_GNUC_FLAG_ENUM (__attribute__((flag_enum))) to many enums in its headers. When a C enum has that attribute, Swift imports it as an OptionSet instead of a plain C enum:

  • the enum's constants become static members of the type instead of global constants
  • the zero-valued member is marked unavailable ("use [] to construct an empty option set")

That's fine for types the GIR describes as <bitfield>. However, a few types are <enumeration> in the GIR but flag enums in the C headers. gir2swift generates code for these that uses the global C constants, and that code no longer compiles:

error: 'G_IO_MODULE_SCOPE_NONE' is unavailable: use [] to construct an empty option set
error: cannot find 'G_TLS_CERTIFICATE_REQUEST_NONE' in scope
error: cannot find 'G_TLS_DATABASE_LOOKUP_NONE' in scope
error: cannot find 'G_TLS_DATABASE_LOOKUP_KEYPAIR' in scope

Fix

Add Sources/CGLib/CGLib.apinotes with FlagEnum: false for the affected types. Clang applies API notes when it loads the module, so these enums import the way they did before GLib 2.88. The headers stay unchanged, and there are no Swift source changes.

Affected types:

  • GIOModuleScopeFlags
  • GTlsCertificateRequestFlags
  • GTlsDatabaseLookupFlags

With older GLib releases these types have no flag_enum attribute, so the notes do nothing there and builds against older GLib are unaffected.

Testing

  • GLib 2.88.0, Swift 6.4.0, Linux x86_64: GIO module builds (previously failed with the errors above)
  • <older GLib version / macOS, if tested>

@rhx
rhx merged commit 895fb27 into rhx:main Oct 7, 2026
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@vivekgalatage @rhx
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