suppress C warnings using unsafeFlags

Author: Sajjon

Package.swift

@@ -5,20 +5,6 @@ import PackageDescription
 
 let development = false
 
-let cSettings: [CSetting] = [
-	// Basic config values that are universal and require no dependencies.
-	// https://github.com/bitcoin-core/secp256k1/blob/master/src/basic-config.h#L12-L13
-	.define("ECMULT_WINDOW_SIZE", to: "15"),
-	.define("ECMULT_GEN_PREC_BITS", to: "4"),
-
-	// Enable modules in secp256k1, for list scroll down to bottom of:
-	// Sources/secp256k1/libsecp256k1/src/secp256k1.c
-	.define("ENABLE_MODULE_ECDH"),
-	.define("ENABLE_MODULE_RECOVERY"),
-	.define("ENABLE_MODULE_SCHNORRSIG"),
-	.define("ENABLE_MODULE_EXTRAKEYS"),
-]
-
 let package = Package(
 	name: "K1",
 	platforms: [
@@ -67,7 +53,24 @@ let package = Package(
 				"libsecp256k1/README.md",
 				"libsecp256k1/SECURITY.md",
 			],
-			cSettings: cSettings
+			cSettings: [
+				// Basic config values that are universal and require no dependencies.
+				// https://github.com/bitcoin-core/secp256k1/blob/master/src/basic-config.h#L12-L13
+				.define("ECMULT_WINDOW_SIZE", to: "15"),
+				.define("ECMULT_GEN_PREC_BITS", to: "4"),
+
+				// Enable modules in secp256k1, for list scroll down to bottom of:
+				// Sources/secp256k1/libsecp256k1/src/secp256k1.c
+				.define("ENABLE_MODULE_ECDH"),
+				.define("ENABLE_MODULE_RECOVERY"),
+				.define("ENABLE_MODULE_SCHNORRSIG"),
+				.define("ENABLE_MODULE_EXTRAKEYS"),
+
+				// Suppress build warnings
+				.unsafeFlags(
+					["-Wno-shorten-64-to-32"]
+				),
+			]
 		),
 		.target(
 			name: "K1",