swiftpm bootstraps on OpenBSD.

Only minor changes are required, however because of #80059 and swiftpm's
use of Concurrency, this only builds on the configuration where BTCFI is
disabled. We can revisit some of that perhaps later; what matters is that
swiftpm finally builds.

Author: 3405691582

Package.swift

@@ -227,7 +227,7 @@ let package = Package(
             name: "Basics",
             dependencies: [
                 "_AsyncFileSystem",
-                .target(name: "SPMSQLite3", condition: .when(platforms: [.macOS, .iOS, .tvOS, .watchOS, .visionOS, .macCatalyst, .linux, .custom("freebsd")])),
+                .target(name: "SPMSQLite3", condition: .when(platforms: [.macOS, .iOS, .tvOS, .watchOS, .visionOS, .macCatalyst, .linux, .openbsd, .custom("freebsd")])),
                 .product(name: "SwiftToolchainCSQLite", package: "swift-toolchain-sqlite", condition: .when(platforms: [.windows, .android])),
                 .product(name: "DequeModule", package: "swift-collections"),
                 .product(name: "OrderedCollections", package: "swift-collections"),

Sources/SPMSQLite3/CMakeLists.txt

@@ -11,3 +11,6 @@ target_include_directories(SPMSQLite3 INTERFACE
   ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(SPMSQLite3 INTERFACE
   SQLite::SQLite3)
+if(CMAKE_SYSTEM_NAME STREQUAL OpenBSD)
+  target_link_options(SPMSQLite3 INTERFACE "-L/usr/local/lib")
+endif()

Utilities/bootstrap

@@ -926,6 +926,10 @@ def get_swiftpm_flags(args):
         ])
 
     if '-openbsd' in args.build_target:
+        # Because of swiftlang/swift#80059, swiftpm only works
+        # with BTCFI disabled.
+        if 'aarch64' in args.build_target:
+            build_flags.extend(["-Xlinker", "-z", "-Xlinker", "nobtcfi"])
         build_flags.extend(["-Xlinker", "-z", "-Xlinker", "origin"])
         build_flags.extend(["-Xcc", "-I/usr/local/include"])
         build_flags.extend(["-Xlinker", "-L/usr/local/lib"])