From 1fc56b82ad6f1060ec4b2074c16accfe0327a4b7 Mon Sep 17 00:00:00 2001
From: Marcio Giaxa <i@mgxm.me>
Date: Tue, 18 Dec 2018 00:19:20 -0200
Subject: [PATCH] freebsd: link against libc

Since the stable kernel ABI is through libc #1759
---
 src/analyze.cpp           |  2 +-
 src/codegen.cpp           |  3 ++-
 std/special/bootstrap.zig | 15 ++++-----------
 3 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/src/analyze.cpp b/src/analyze.cpp
index 46686ce772..064cf11cc1 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -6366,7 +6366,7 @@ LinkLib *add_link_lib(CodeGen *g, Buf *name) {
     if (is_libc && g->libc_link_lib != nullptr)
         return g->libc_link_lib;
 
-    if (g->enable_cache && is_libc && g->zig_target.os != OsMacOSX && g->zig_target.os != OsIOS) {
+    if (g->enable_cache && is_libc && g->zig_target.os != OsMacOSX && g->zig_target.os != OsIOS && g->zig_target.os != OsFreeBSD) {
         fprintf(stderr, "TODO linking against libc is currently incompatible with `--cache on`.\n"
         "Zig is not yet capable of determining whether the libc installation has changed on subsequent builds.\n");
         exit(1);
diff --git a/src/codegen.cpp b/src/codegen.cpp
index e37703d5f0..e2d23513ff 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -178,7 +178,8 @@ CodeGen *codegen_create(Buf *root_src_path, const ZigTarget *target, OutType out
 
     // On Darwin/MacOS/iOS, we always link libSystem which contains libc.
     if (g->zig_target.os == OsMacOSX ||
-        g->zig_target.os == OsIOS)
+        g->zig_target.os == OsIOS ||
+	g->zig_target.os == OsFreeBSD)
     {
         g->libc_link_lib = create_link_lib(buf_create_from_str("c"));
         g->link_libs_list.append(g->libc_link_lib);
diff --git a/std/special/bootstrap.zig b/std/special/bootstrap.zig
index a15be317ab..129bde913f 100644
--- a/std/special/bootstrap.zig
+++ b/std/special/bootstrap.zig
@@ -20,17 +20,10 @@ comptime {
 
 nakedcc fn _start() noreturn {
     switch (builtin.arch) {
-        builtin.Arch.x86_64 => switch (builtin.os) {
-            builtin.Os.freebsd => {
-                argc_ptr = asm ("lea (%%rdi), %[argc]"
-                    : [argc] "=r" (-> [*]usize)
-                );
-            },
-            else => {
-                argc_ptr = asm ("lea (%%rsp), %[argc]"
-                    : [argc] "=r" (-> [*]usize)
-                );
-            },
+        builtin.Arch.x86_64 => {
+            argc_ptr = asm ("lea (%%rsp), %[argc]"
+                                : [argc] "=r" (-> [*]usize)
+                            );
         },
         builtin.Arch.i386 => {
             argc_ptr = asm ("lea (%%esp), %[argc]"