mod: remove dependency to c std library and replace with ztime dependency for a pure zig implementation

build.zig

@@ -27,14 +27,19 @@ pub fn build(b: *std.Build) void {
     // set a preferred release mode, allowing the user to decide how to optimize.
     const optimize = b.standardOptimizeOption(.{});
 
+    const ztime_dependency = b.dependency("ztime", .{
+        .target = target,
+        .optimize = optimize,
+    });
+
     const zlog_module = b.addModule("zlog", .{
         // In this case the main source file is merely a path, however, in more
         // complicated build scripts, this could be a generated file.
         .root_source_file = b.path("src/zlog.zig"),
         .target = target,
         .optimize = optimize,
-        .link_libc = include_timestamp, // uses c std library <time.h>
     });
+    zlog_module.addImport("ztime", ztime_dependency.module("ztime"));
     zlog_module.addImport("build_options", options_module);
 
     const exe = b.addExecutable(.{
@@ -43,6 +48,7 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
+    exe.root_module.addImport("ztime", ztime_dependency.module("ztime"));
     exe.root_module.addImport("zlog", zlog_module);
 
     // This declares intent for the executable to be installed into the
@@ -50,17 +56,6 @@ pub fn build(b: *std.Build) void {
     // step when running `zig build`).
     b.installArtifact(exe);
 
-    const exe_check = b.addExecutable(.{
-        .name = "check",
-        .root_source_file = b.path("src/main.zig"),
-        .target = target,
-        .optimize = optimize,
-    });
-    exe_check.root_module.addImport("zlog", zlog_module);
-
-    const check = b.step("check", "Check if project compiles");
-    check.dependOn(&exe_check.step);
-
     // This *creates* a Run step in the build graph, to be executed when another
     // step is evaluated that depends on it. The next line below will establish
     // such a dependency.
@@ -91,6 +86,8 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
+    lib_unit_tests.root_module.addImport("ztime", ztime_dependency.module("ztime"));
+    lib_unit_tests.root_module.addImport("build_options", options_module);
 
     const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);