Zig build system updated: can compile static binaries.

mk/makefile.static-build

@@ -1,6 +1,7 @@
 ifdef STATIC
 STATIC_BUILD ?= -static
 CRYSTAL_STATIC_BUILD ?= --static
+ZIG_STATIC_BUILD ?= -Dstatic=true
 endif
 
 # For interactive completion in the shell.

zig/build.zig

@@ -58,4 +58,12 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
     link_and_install(pongd_exe);
+
+    const is_static = b.option(bool, "static", "Compile static binaries.") orelse false;
+    if (is_static) {
+        ipcd_exe.linkage = .static;
+        tcpd_exe.linkage = .static;
+        pong_exe.linkage = .static;
+        pongd_exe.linkage = .static;
+    }
 }

zig/makefile

@@ -1,9 +1,11 @@
 all: build
 
+include ../mk/makefile.utils
+
 update-libipc:
 	git submodule update
 
 ZIG_OPTS  ?=
 ZIG_OPTIM ?= ReleaseSafe
 build:
-	zig build -Doptimize=$(ZIG_OPTIM) $(ZIG_OPTS)
+	zig build -Doptimize=$(ZIG_OPTIM) $(ZIG_OPTS) $(ZIG_STATIC_BUILD)