From 6afe668ec7a11736a9418a46370af89a8c657ee8 Mon Sep 17 00:00:00 2001
From: seyko <seyko2@gmail.com>
Date: Sun, 1 May 2016 22:38:38 +0300
Subject: [PATCH] __asm__() outside function

    gcc/pcc allow __asm__() outside a function body:
    extern void vide(void);
    __asm__("vide: ret");

    There is many such code in the Linux kernels.
---
 tccasm.c                                    | 10 ++++++++++
 tests/tests2/85-asm-outside-function.c      |  7 +++++++
 tests/tests2/85-asm-outside-function.expect |  0
 3 files changed, 17 insertions(+)
 create mode 100644 tests/tests2/85-asm-outside-function.c
 create mode 100644 tests/tests2/85-asm-outside-function.expect

diff --git a/tccasm.c b/tccasm.c
index 72121e4..3fd69f7 100644
--- a/tccasm.c
+++ b/tccasm.c
@@ -824,6 +824,16 @@ static int tcc_assemble_internal(TCCState *s1, int do_preprocess)
             opcode = tok;
             next();
             if (tok == ':') {
+                /* handle "extern void vide(void); __asm__("vide: ret");" as
+                "__asm__("globl vide\nvide: ret");" */
+                Sym *sym = sym_find(opcode);
+                if (sym && (sym->type.t & VT_EXTERN) && nocode_wanted) {
+                    sym = label_find(opcode);
+                    if (!sym) {
+                        sym = label_push(&s1->asm_labels, opcode, 0);
+                        sym->type.t = VT_VOID;
+                    }
+                }
                 /* new label */
                 asm_new_label(s1, opcode, 0);
                 next();
diff --git a/tests/tests2/85-asm-outside-function.c b/tests/tests2/85-asm-outside-function.c
new file mode 100644
index 0000000..0aa7e33
--- /dev/null
+++ b/tests/tests2/85-asm-outside-function.c
@@ -0,0 +1,7 @@
+extern void vide(void);
+__asm__("vide: ret");
+
+int main() {
+    vide();
+    return 0;
+}
diff --git a/tests/tests2/85-asm-outside-function.expect b/tests/tests2/85-asm-outside-function.expect
new file mode 100644
index 0000000..e69de29