feat: use own cImport

build.zig

@@ -1,7 +1,22 @@
 const std = @import("std");
 
 pub fn build(b: *std.build.Builder) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
     _ = b.addModule("zig-glib-log", .{
         .source_file = .{ .path = "src/main.zig" },
     });
+
+    const test_exe = b.addTest(.{
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    test_exe.linkLibC();
+    test_exe.linkSystemLibrary("glib-2.0");
+
+    const test_step = b.step("test", "run tests");
+    test_step.dependOn(&b.addRunArtifact(test_exe).step);
 }

src/main.zig

@@ -1,21 +1,20 @@
 const std = @import("std");
 const testing = std.testing;
 
+const c = @cImport(@cInclude("glib.h"));
+
 /// Returns the log function, which must be present in the root module.
 pub fn log(
-    /// The value returned by @cImport.
-    /// Must include the "glib.h" or "glib/gmessages.h" header.
-    comptime c: type,
     /// The name of the module used for the log output.
     comptime module_name: []const u8,
     /// The length of the buffer used for the formatted output.
     /// This is the maximum length of log messages.
     comptime buf_size: usize,
-) @TypeOf(LogStruct(c, module_name, buf_size).log) {
-    return LogStruct(c, module_name, buf_size).log;
+) @TypeOf(LogStruct(module_name, buf_size).log) {
+    return LogStruct(module_name, buf_size).log;
 }
 
-fn LogStruct(comptime c: type, comptime module_name: []const u8, comptime buf_size: usize) type {
+fn LogStruct(comptime module_name: []const u8, comptime buf_size: usize) type {
     return struct {
         threadlocal var fmt_buf: [buf_size]u8 = undefined;
 
@@ -42,7 +41,6 @@ fn LogStruct(comptime c: type, comptime module_name: []const u8, comptime buf_si
                 c.GLogField{
                     .key = "GLIB_DOMAIN",
                     .value = @ptrCast(
-                        *const anyopaque,
                         // don't include scope name if not explicitly specified
                         if (std.mem.eql(u8, @tagName(scope), "default"))
                             module_name
@@ -53,7 +51,7 @@ fn LogStruct(comptime c: type, comptime module_name: []const u8, comptime buf_si
                 },
                 c.GLogField{
                     .key = "MESSAGE",
-                    .value = @ptrCast(*const anyopaque, s),
+                    .value = @ptrCast(s),
                     .length = -1,
                 },
             };
@@ -68,5 +66,10 @@ fn LogStruct(comptime c: type, comptime module_name: []const u8, comptime buf_si
 }
 
 test {
-    std.testing.refAllDecls(@This());
+    const logF = log("zig-glib-log", 1024 * 4);
+
+    logF(.debug, .default, "debug", .{});
+    logF(.info, .default, "info", .{});
+    logF(.warn, .default, "warn", .{});
+    logF(.err, .default, "error", .{});
 }