Add -static option

chibicc.h

@@ -113,7 +113,6 @@ Token *tokenize_file(char *filename);
 //
 
 char *search_include_paths(char *filename);
-bool file_exists(char *path);
 void init_macros(void);
 void define_macro(char *name, char *buf);
 void undef_macro(char *name);

main.c

@@ -19,6 +19,7 @@ static bool opt_S;
 static bool opt_c;
 static bool opt_cc1;
 static bool opt_hash_hash_hash;
+static bool opt_static;
 static char *opt_MF;
 static char *opt_MT;
 static char *opt_o;
@@ -277,6 +278,12 @@ static void parse_args(int argc, char **argv) {
       continue;
     }
 
+    if (!strcmp(argv[i], "-static")) {
+      opt_static = true;
+      strarray_push(&ld_extra_args, "-static");
+      continue;
+    }
+
     if (!strcmp(argv[i], "-hashmap-test")) {
       hashmap_test();
       exit(0);
@@ -587,8 +594,6 @@ static void run_linker(StringArray *inputs, char *output) {
   strarray_push(&arr, output);
   strarray_push(&arr, "-m");
   strarray_push(&arr, "elf_x86_64");
-  strarray_push(&arr, "-dynamic-linker");
-  strarray_push(&arr, "/lib64/ld-linux-x86-64.so.2");
 
   char *libpath = find_libpath();
   char *gcc_libpath = find_gcc_libpath();
@@ -597,8 +602,7 @@ static void run_linker(StringArray *inputs, char *output) {
   strarray_push(&arr, format("%s/crti.o", libpath));
   strarray_push(&arr, format("%s/crtbegin.o", gcc_libpath));
   strarray_push(&arr, format("-L%s", gcc_libpath));
-  strarray_push(&arr, format("-L%s", libpath));
+  strarray_push(&arr, "-L/usr/lib/x86_64-linux-gnu");
-  strarray_push(&arr, format("-L%s/..", libpath));
   strarray_push(&arr, "-L/usr/lib64");
   strarray_push(&arr, "-L/lib64");
   strarray_push(&arr, "-L/usr/lib/x86_64-linux-gnu");
@@ -607,17 +611,31 @@ static void run_linker(StringArray *inputs, char *output) {
   strarray_push(&arr, "-L/usr/lib");
   strarray_push(&arr, "-L/lib");
 
+  if (!opt_static) {
+    strarray_push(&arr, "-dynamic-linker");
+    strarray_push(&arr, "/lib64/ld-linux-x86-64.so.2");
+  }
+
   for (int i = 0; i < ld_extra_args.len; i++)
     strarray_push(&arr, ld_extra_args.data[i]);
 
   for (int i = 0; i < inputs->len; i++)
     strarray_push(&arr, inputs->data[i]);
 
+  if (opt_static) {
+    strarray_push(&arr, "--start-group");
+    strarray_push(&arr, "-lgcc");
+    strarray_push(&arr, "-lgcc_eh");
+    strarray_push(&arr, "-lc");
+    strarray_push(&arr, "--end-group");
+  } else {
     strarray_push(&arr, "-lc");
     strarray_push(&arr, "-lgcc");
     strarray_push(&arr, "--as-needed");
     strarray_push(&arr, "-lgcc_s");
     strarray_push(&arr, "--no-as-needed");
+  }
+
   strarray_push(&arr, format("%s/crtend.o", gcc_libpath));
   strarray_push(&arr, format("%s/crtn.o", libpath));
   strarray_push(&arr, NULL);

test/driver.sh

@@ -274,4 +274,12 @@ echo 'foo' > $tmp/next3/file2.h
 $chibicc -I$tmp/next1 -I$tmp/next2 -I$tmp/next3 -E $tmp/file.c | grep -q foo
 check '#include_next'
 
+# -static
+echo 'extern int bar; int foo() { return bar; }' > $tmp/foo.c
+echo 'int foo(); int bar=3; int main() { foo(); }' > $tmp/bar.c
+$chibicc -static -o $tmp/foo $tmp/foo.c $tmp/bar.c
+check -static
+file $tmp/foo | grep -q 'statically linked'
+check -static
+
 echo OK