Swift package manager (nanopb#549)

Add build rules for Swift package manager

Author: paulb777

.github/workflows/spm.yml

@@ -0,0 +1,15 @@
+name: spm
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  swift-build-run:
+    runs-on: macOS-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: swift build
+    - name: Run
+      run: swift test

Package.swift

@@ -0,0 +1,63 @@
+// swift-tools-version:5.0
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "nanopb",
+    platforms: [
+        .macOS(.v10_10),
+        .iOS(.v8),
+        .tvOS(.v9),
+        .watchOS(.v2)
+    ],
+
+  targets: [
+    .target(
+      name: "nanopb",
+      path: ".",
+      sources: [
+        "pb.h",
+        "pb_common.h",
+        "pb_common.c",
+        "pb_decode.h",
+        "pb_decode.c",
+        "pb_encode.h",
+        "pb_encode.c"
+      ],
+      publicHeadersPath: "SwiftPackage",
+      cSettings: [
+        .define("PB_FIELD_32BIT", to: "1"),
+        .define("PB_NO_PACKED_STRUCTS", to: "1"),
+        .define("PB_ENABLE_MALLOC", to: "1"),
+      ]
+    ),
+    .testTarget(
+      name: "swift-test",
+      dependencies: [
+        "nanopb",
+      ],
+      path: "spm-test/swift",
+      cSettings: [
+        .headerSearchPath("../"),
+        .define("PB_FIELD_32BIT", to: "1"),
+        .define("PB_NO_PACKED_STRUCTS", to: "1"),
+        .define("PB_ENABLE_MALLOC", to: "1"),
+      ]
+    ),
+    .testTarget(
+      name: "objc-test",
+      dependencies: [
+        "nanopb",
+      ],
+      path: "spm-test/objc",
+      cSettings: [
+        .headerSearchPath("../"),
+        .define("PB_FIELD_32BIT", to: "1"),
+        .define("PB_NO_PACKED_STRUCTS", to: "1"),
+        .define("PB_ENABLE_MALLOC", to: "1"),
+      ]
+    )
+  ]
+)
+

SwiftPackage/module.modulemap

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+module nanopb {
+    umbrella header "nanopb.h"
+
+    export *
+}

SwiftPackage/nanopb.h

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+#import "../pb.h"
+#import "../pb_common.h"
+#import "../pb_decode.h"
+#import "../pb_encode.h"

spm-test/objc/c-header.c

@@ -0,0 +1 @@
+#include "nanopb.h"

spm-test/objc/objc-header.m

@@ -0,0 +1 @@
+#import "nanopb.h"

spm-test/objc/objc-module.m

@@ -0,0 +1 @@
+@import nanopb;

spm-test/swift/main.swift

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+import nanopb