3 files changed, 53 insertions, 3 deletions

diff --git a/eval.cc b/eval.cc
index 511a606..44c436e 100644
--- a/eval.cc
+++ b/eval.cc
@@ -35,7 +35,7 @@ void Evaluator::EvalAssign(const AssignAST* ast) {
   loc_ = ast->loc();
   last_rule_ = NULL;
 
-  const char* origin = "file";
+  const char* origin = is_bootstrap_ ? "default" : "file";
 
   StringPiece lhs = Intern(*ast->lhs->Eval(this));
   Var* rhs = NULL;
diff --git a/eval.h b/eval.h
index adb3700..7461d73 100644
--- a/eval.h
+++ b/eval.h
@@ -42,7 +42,6 @@ class Evaluator {
   void EvalInclude(const IncludeAST* ast);
   void EvalExport(const ExportAST* ast);
 
-
   Var* LookupVar(StringPiece name);
   // For target specific variables.
   Var* LookupVarInCurrentScope(StringPiece name);
@@ -55,6 +54,8 @@ class Evaluator {
 
   void Error(const string& msg);
 
+  void set_is_bootstrap(bool b) { is_bootstrap_ = b; }
+
  private:
   void DoInclude(const char* fname, bool should_exist);
 
@@ -65,6 +66,7 @@ class Evaluator {
   Rule* last_rule_;
 
   Loc loc_;
+  bool is_bootstrap_;
 };
 
 #endif  // EVAL_H_
diff --git a/main.cc b/main.cc
index 3b1fb9d..1a5e0cf 100644
--- a/main.cc
+++ b/main.cc
@@ -1,5 +1,7 @@
+#include <limits.h>
 #include <stdio.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "ast.h"
 #include "dep.h"
@@ -12,6 +14,7 @@
 #include "log.h"
 #include "parser.h"
 #include "string_piece.h"
+#include "stringprintf.h"
 #include "strutil.h"
 #include "var.h"
 
@@ -57,13 +60,56 @@ static void Quit() {
   QuitSymtab();
 }
 
+static void ReadBootstrapMakefile(const vector<StringPiece>& targets,
+                                  vector<AST*>* asts) {
+  string bootstrap = (
+      "CC:=cc\n"
+      "CXX:=g++\n"
+      "AR:=ar\n"
+      "MAKE:=kati\n"
+      // Pretend to be GNU make 3.81, for compatibility.
+      "MAKE_VERSION:=3.81\n"
+      "SHELL:=/bin/sh\n"
+      // TODO: Add more builtin vars.
+
+      // http://www.gnu.org/software/make/manual/make.html#Catalogue-of-Rules
+      // The document above is actually not correct. See default.c:
+      // http://git.savannah.gnu.org/cgit/make.git/tree/default.c?id=4.1
+      ".c.o:\n"
+      "\t$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -o $@ $<\n"
+      ".cc.o:\n"
+      "\t$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -o $@ $<\n"
+      // TODO: Add more builtin rules.
+                      );
+  bootstrap += StringPrintf("MAKECMDGOALS:=%s\n",
+                            JoinStrings(targets, " ").c_str());
+
+  char cwd[PATH_MAX];
+  if (!getcwd(cwd, PATH_MAX)) {
+    fprintf(stderr, "getcwd failed\n");
+    CHECK(false);
+  }
+  bootstrap += StringPrintf("CURDIR:=%s\n", cwd);
+  Parse(Intern(bootstrap), Loc("*bootstrap*", 0), asts);
+}
+
 static int Run(const vector<StringPiece>& targets) {
   MakefileCacheManager* cache_mgr = NewMakefileCacheManager();
-  Makefile* mk = cache_mgr->ReadMakefile(g_makefile);
 
   // TODO: Fill env, etc.
   Vars* vars = new Vars();
   Evaluator* ev = new Evaluator(vars);
+
+  vector<AST*> bootstrap_asts;
+  ReadBootstrapMakefile(targets, &bootstrap_asts);
+  ev->set_is_bootstrap(true);
+  for (AST* ast : bootstrap_asts) {
+    LOG("%s", ast->DebugString().c_str());
+    ast->Eval(ev);
+  }
+  ev->set_is_bootstrap(false);
+
+  Makefile* mk = cache_mgr->ReadMakefile(g_makefile);
   for (AST* ast : mk->asts()) {
     LOG("%s", ast->DebugString().c_str());
     ast->Eval(ev);
@@ -80,6 +126,8 @@ static int Run(const vector<StringPiece>& targets) {
 
   Exec(nodes, vars);
 
+  for (AST* ast : bootstrap_asts)
+    delete ast;
   delete er;
   delete ev;
   delete vars;