cgen: output .bc file

.gitignore

@@ -1 +1,3 @@
 zig-cache/
+*.bc
+*.ll

build.zig

@@ -6,7 +6,9 @@ pub fn build(b: *Builder) void {
     exe.setBuildMode(mode);
     exe.install();
 
+    exe.linkSystemLibrary("c");
     exe.linkSystemLibrary("LLVM-8");
+    exe.linkSystemLibrary("stdc++");
 
     const run_cmd = exe.run();
     run_cmd.step.dependOn(b.getInstallStep());

src/codegen.zig

@@ -62,18 +62,18 @@ pub const Codegen = struct {
     }
 
     pub fn gen(self: *Codegen, root: *ast.Node) !void {
+        //std.debug.warn("cgen: init native target\n");
+        //_ = llvm.LLVMInitializeNativeTarget();
         std.debug.warn("cgen: start gen\n");
-        var mod = llvm.LLVMModuleCreateWithName(c"awoo");
+
+        var mod = llvm.LLVMModuleCreateWithName(c"awoo").?;
         defer llvm.LLVMDisposeModule(mod);
-        std.debug.warn("cgen: got mod\n");
 
         for (root.Root.toSlice()) |child| {
             std.debug.warn("cgen: gen child {}\n", child);
             try self.genNode(mod, &child);
         }
 
-        std.debug.warn("cgen: done\n");
-
         var err: ?[*]u8 = null;
         _ = llvm.LLVMVerifyModule(
             mod,
@@ -81,5 +81,9 @@ pub const Codegen = struct {
             &err,
         );
         llvm.LLVMDisposeMessage(err);
+
+        if (llvm.LLVMWriteBitcodeToFile(mod, c"awoo.bc") != 0) {
+            std.debug.warn("error writing bitcode to file\n");
+        }
     }
 };

src/llvm.zig

@@ -6,6 +6,11 @@ pub const llvm = @cImport({
     @cInclude("llvm-c/Target.h");
     @cInclude("llvm-c/Analysis.h");
     @cInclude("llvm-c/BitWriter.h");
+
+    @cDefine("_GNU_SOURCE", {});
+    @cDefine("__STDC_CONSTANT_MACROS", {});
+    @cDefine("__STDC_FORMAT_MACROS", {});
+    @cDefine("__STDC_LIMIT_MACROS", {});
 });
 
 usingnamespace llvm;