Merge pull request #171 from akgvn/master

Cross-compilation through Zig compiler toolchain

.gitignore

@@ -2,3 +2,6 @@
 bin/
 build/
 .idea/
+zig-cache/
+zig-out/
+.DS_Store

build.zig

@@ -0,0 +1,71 @@
+// Used the following as cross-compilation build.zig example:
+// https://git.sr.ht/~jamii/focus/tree/master/build.zig
+
+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) !void {
+    const windows = b.addStaticLibrary("mqtt-c", null);
+    try includeCommon(windows);
+    windows.setTarget(std.zig.CrossTarget{
+        .cpu_arch = .x86_64,
+        .os_tag = .windows,
+    });
+    windows.install();
+
+    const apple_silicon_mac = b.addStaticLibrary("mqtt-c-apple-silicon", null);
+    try includeCommon(apple_silicon_mac);
+    apple_silicon_mac.setTarget(std.zig.CrossTarget{
+        .cpu_arch = .aarch64,
+        .os_tag = .macos,
+    });
+    apple_silicon_mac.install();
+
+    const x86_64_mac = b.addStaticLibrary("mqtt-c-mac-x64", null);
+    try includeCommon(x86_64_mac);
+    x86_64_mac.setTarget(std.zig.CrossTarget{
+        .cpu_arch = .x86_64,
+        .os_tag = .macos,
+    });
+    x86_64_mac.install();
+
+    const x86_64_linux = b.addStaticLibrary("mqtt-c-x64", null);
+    try includeCommon(x86_64_linux);
+    x86_64_linux.setTarget(std.zig.CrossTarget{
+        .cpu_arch = .x86_64,
+        .os_tag = .linux,
+    });
+    x86_64_linux.install();
+
+    const arm64_linux = b.addStaticLibrary("mqtt-c-arm64", null);
+    try includeCommon(arm64_linux);
+    arm64_linux.setTarget(std.zig.CrossTarget{
+        .cpu_arch = .aarch64,
+        .os_tag = .linux,
+    });
+    arm64_linux.install();
+
+    const windows_step = b.step("windows", "Build for Windows");
+    windows_step.dependOn(&windows.step);
+
+    const apple_silicon_mac_step = b.step("apple_silicon_mac", "Build for Apple Silicon Macs");
+    apple_silicon_mac_step.dependOn(&apple_silicon_mac.step);
+
+    const x86_64_mac_step = b.step("x86_64_mac", "Build for Intel Macs");
+    x86_64_mac_step.dependOn(&x86_64_mac.step);
+
+    const x86_64_linux_step = b.step("x86_64_linux", "Build for Linux");
+    x86_64_linux_step.dependOn(&x86_64_linux.step);
+
+    const arm64_linux_step = b.step("arm64_linux", "Build for ARM64 Linux");
+    arm64_linux_step.dependOn(&arm64_linux.step);
+}
+
+fn includeCommon(lib: *std.build.LibExeObjStep) !void {
+    lib.addIncludeDir("include");
+
+    lib.addCSourceFile("src/mqtt.c", &[_][]const u8 {});
+    lib.addCSourceFile("src/mqtt_pal.c", &[_][]const u8 {});
+
+    lib.setBuildMode(.Debug); // Can be .Debug, .ReleaseSafe, .ReleaseFast, and .ReleaseSmall
+    lib.linkLibC();
+}