build: silence duplicate -lobjc linker warning on Xcode 15+

Add -Wl,-no_warn_duplicate_libraries to the darwin cgo LDFLAGS and allow
it through the cgo flag allowlist via CGO_LDFLAGS_ALLOW in the build
scripts, so the ld-prime duplicate -lobjc note no longer clutters build
output.

activation_policy_darwin.go

@@ -5,6 +5,12 @@ package main
 /*
 #cgo CFLAGS: -x objective-c -fobjc-arc
 #cgo LDFLAGS: -framework AppKit
+// Silence the "ignoring duplicate libraries: '-lobjc'" note emitted by the
+// Xcode 15+ linker (ld-prime): cgo links -lobjc for our Objective-C code and
+// the Go darwin runtime pulls it in as well, which the new linker flags as a
+// duplicate. Suppressing it here keeps the build output clean; the flag is a
+// no-op on the legacy ld64 path.
+#cgo LDFLAGS: -Wl,-no_warn_duplicate_libraries
 #include <dispatch/dispatch.h>
 #import <AppKit/AppKit.h>
 

scripts/dev-build.sh

@@ -43,6 +43,9 @@ sleep 0.4
 #    --identity flag in v2.
 ARCH="${ARCH:-arm64}"
 echo "[dev-build.sh] building darwin/${ARCH}..."
+# Allow the -Wl,-no_warn_duplicate_libraries flag declared in the darwin cgo
+# files past Go's cgo LDFLAGS allowlist (see activation_policy_darwin.go).
+export CGO_LDFLAGS_ALLOW='-Wl,-no_warn_duplicate_libraries'
 wails build -platform "darwin/${ARCH}" -clean
 
 # 5. Re-sign with the stable dev cert. We invoke sign.sh through env var

scripts/release.sh

@@ -35,7 +35,9 @@ echo "================================================================"
 # ---- 1. Build ----
 echo ""
 echo "[release.sh] (1/4) wails build"
-( cd "${ROOT_DIR}" && wails build -platform "${WAILS_PLATFORM}" -clean )
+# Allow the -Wl,-no_warn_duplicate_libraries flag declared in the darwin cgo
+# files past Go's cgo LDFLAGS allowlist (see activation_policy_darwin.go).
+( cd "${ROOT_DIR}" && CGO_LDFLAGS_ALLOW='-Wl,-no_warn_duplicate_libraries' wails build -platform "${WAILS_PLATFORM}" -clean )
 
 # ---- 2. Sign .app ----
 echo ""