add flexilib-interface module for flexilib client builds

src/flexilib_build.zig

@@ -6,9 +6,17 @@ const builtin = @import("builtin");
 /// For flexilib, we will need the main file to have a pub fn named
 /// "handler". If it is not called that, a pub const handler = ... can be
 /// used instead
-pub fn configureBuild(b: *std.build.Builder, exe: *std.Build.Step.Compile, build_root_src: []const u8) !void {
+pub fn configureBuild(b: *std.build.Builder, cs: *std.Build.Step.Compile, build_root_src: []const u8) !void {
     const package_step = b.step("flexilib", "Create a flexilib dynamic library");
 
+    // We'll need to add the interface module here as well
+    const flexilib_dep = b.dependency("flexilib", .{
+        .target = cs.target,
+        .optimize = cs.optimize,
+    });
+    const flexilib_module = flexilib_dep.module("flexilib-interface");
+    cs.addModule("flexilib-interface", flexilib_module);
+
     // const exe = b.addExecutable(.{
     //     .name = "universal-lambda-example",
     //     // In this case the main source file is merely a path, however, in more
@@ -19,16 +27,16 @@ pub fn configureBuild(b: *std.build.Builder, exe: *std.Build.Step.Compile, build
     // });
     //
     const lib = b.addSharedLibrary(.{
-        .name = exe.name,
+        .name = cs.name,
         .root_source_file = .{ .path = b.pathJoin(&[_][]const u8{ build_root_src, "flexilib.zig" }) },
-        .target = exe.target,
-        .optimize = exe.optimize,
+        .target = cs.target,
+        .optimize = cs.optimize,
     });
 
     // We will not free this, as the rest of the build system will use it.
     // This should be ok because our allocator is, I believe, an arena
-    var module_dependencies = try b.allocator.alloc(std.Build.ModuleDependency, exe.modules.count());
-    var iterator = exe.modules.iterator();
+    var module_dependencies = try b.allocator.alloc(std.Build.ModuleDependency, cs.modules.count());
+    var iterator = cs.modules.iterator();
 
     var i: usize = 0;
     while (iterator.next()) |entry| : (i += 1) {
@@ -40,7 +48,7 @@ pub fn configureBuild(b: *std.build.Builder, exe: *std.Build.Step.Compile, build
     }
     lib.addAnonymousModule("flexilib_handler", .{
         // Source file can be anywhere on disk, does not need to be a subdirectory
-        .source_file = exe.root_src.?,
+        .source_file = cs.root_src.?,
         .dependencies = module_dependencies,
     });
     package_step.dependOn(&b.addInstallArtifact(lib, .{}).step);