From 243e3cc6947ada3d12b0dde88f51aed64774799e Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Sat, 21 Sep 2019 12:31:47 -0300
Subject: [PATCH 1/2] fix llvm linking

---
 build.zig       | 2 ++
 src/codegen.zig | 6 ++++--
 src/llvm.zig    | 5 +++++
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/build.zig b/build.zig
index d7502d4..020f6cf 100644
--- a/build.zig
+++ b/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());
diff --git a/src/codegen.zig b/src/codegen.zig
index 3e5661c..295bf85 100644
--- a/src/codegen.zig
+++ b/src/codegen.zig
@@ -62,10 +62,12 @@ 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);
diff --git a/src/llvm.zig b/src/llvm.zig
index 8e79786..f849857 100644
--- a/src/llvm.zig
+++ b/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;

From 86e899e771e91edc3625fa07061175b16e5c14d1 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Sat, 21 Sep 2019 12:37:41 -0300
Subject: [PATCH 2/2] cgen: output .bc file

---
 .gitignore      | 2 ++
 src/codegen.zig | 6 ++++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/.gitignore b/.gitignore
index 3cef7be..900a841 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,3 @@
 zig-cache/
+*.bc
+*.ll
diff --git a/src/codegen.zig b/src/codegen.zig
index 295bf85..37e39ac 100644
--- a/src/codegen.zig
+++ b/src/codegen.zig
@@ -74,8 +74,6 @@ pub const Codegen = struct {
             try self.genNode(mod, &child);
         }
 
-        std.debug.warn("cgen: done\n");
-
         var err: ?[*]u8 = null;
         _ = llvm.LLVMVerifyModule(
             mod,
@@ -83,5 +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");
+        }
     }
 };