From 59b869b356af81284cdc1d69ee04e77da6548333 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Wed, 10 Nov 2021 15:31:32 +0100
Subject: [PATCH] Add preliminary build.zig file

---
 .gitignore |  2 ++
 build.zig  | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 73 insertions(+)
 create mode 100644 build.zig

diff --git a/.gitignore b/.gitignore
index 3f3ccb2c..44bef90f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -168,3 +168,5 @@ test/default/verify1
 test/default/xchacha20
 test/js.done
 testing
+zig-cache
+zig-out
diff --git a/build.zig b/build.zig
new file mode 100644
index 00000000..082f724d
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,71 @@
+const std = @import("std");
+const builtin = @import("builtin");
+const fmt = std.fmt;
+const fs = std.fs;
+const heap = std.heap;
+const mem = std.mem;
+
+pub fn build(b: *std.build.Builder) !void {
+    var target = b.standardTargetOptions(.{});
+    var mode = b.standardReleaseOptions();
+
+    const libsodium = b.addStaticLibrary("libsodium", null);
+    libsodium.setTarget(target);
+    libsodium.setBuildMode(mode);
+    libsodium.install();
+    libsodium.linkLibC();
+
+    libsodium.addIncludeDir("src/libsodium/include/sodium");
+    libsodium.defineCMacro("CONFIGURED", "1");
+    libsodium.defineCMacro("DEV_MODE", "1");
+    libsodium.defineCMacro("_GNU_SOURCE", "1");
+    libsodium.defineCMacro("HAVE_INLINE_ASM", "1");
+    libsodium.defineCMacro("HAVE_TI_MODE", "1");
+    libsodium.defineCMacro("HAVE_ATOMIC_OPS", "1");
+    libsodium.defineCMacro("ASM_HIDE_SYMBOL", ".private_extern");
+
+    switch (target.getCpuArch()) {
+        .x86_64 => {
+            libsodium.defineCMacro("HAVE_AMD64_ASM", "1");
+            libsodium.defineCMacro("HAVE_AVX_ASM", "1");
+            libsodium.defineCMacro("HAVE_CPUID", "1");
+            libsodium.defineCMacro("HAVE_MMINTRIN_H", "1");
+            libsodium.defineCMacro("HAVE_EMMINTRIN_H", "1");
+            libsodium.defineCMacro("HAVE_PMMINTRIN_H", "1");
+        },
+        .aarch64, .aarch64_be => {
+            libsodium.defineCMacro("HAVE_ARMCRYTO", "1");
+        },
+        .wasm32, .wasm64 => {
+            libsodium.defineCMacro("__wasm__", "1");
+        },
+        else => {},
+    }
+
+    switch (target.getOsTag()) {
+        .wasi => {
+            libsodium.defineCMacro("__wasi__", "1");
+        },
+        else => {},
+    }
+
+    const base = "src/libsodium";
+    const dir = try fs.Dir.openDir(fs.cwd(), base, .{ .iterate = true, .no_follow = true });
+    var allocator = heap.page_allocator;
+    var walker = try dir.walk(allocator);
+    while (try walker.next()) |entry| {
+        const name = entry.basename;
+        if (mem.endsWith(u8, name, ".c")) {
+            const full_path = try fmt.allocPrint(allocator, "{s}/{s}", .{ base, entry.path });
+            libsodium.addCSourceFiles(&.{full_path}, &.{
+                "-fvisibility=hidden",
+                "-fno-strict-aliasing",
+                "-fno-strict-overflow",
+                "-fwrapv",
+                "-flax-vector-conversions",
+            });
+        }
+    }
+
+    libsodium.defineCMacro("CONFIGURED", "1");
+}