From 38685e188787e657f8b1f5962b963210ecca5ffa Mon Sep 17 00:00:00 2001
From: Josh Gao <jmgao@google.com>
Date: Mon, 30 Oct 2017 12:45:09 -0700
Subject: [PATCH] versioner: follow __asm__ labels.

Attribute the versioning information on `void foo() __asm("bar")` to
bar, not foo.

The various long double functions in <math.h> run into this.

Bug: https://github.com/android-ndk/ndk/issues/440
Test: python run_tests.py
Test: m
Change-Id: Idd3681ddbd006b4705608449935c9cfacfa3556e
---
 tools/versioner/src/DeclarationDatabase.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/versioner/src/DeclarationDatabase.cpp b/tools/versioner/src/DeclarationDatabase.cpp
index aef4f550f..33bccf372 100644
--- a/tools/versioner/src/DeclarationDatabase.cpp
+++ b/tools/versioner/src/DeclarationDatabase.cpp
@@ -54,6 +54,11 @@ class Visitor : public RecursiveASTVisitor<Visitor> {
       }
     }
 
+    // <math.h> maps fool onto foo on 32-bit, since long double is the same as double.
+    if (auto asm_attr = decl->getAttr<AsmLabelAttr>()) {
+      return asm_attr->getLabel();
+    }
+
     // The decl might not have a name (e.g. bitfields).
     if (auto identifier = decl->getIdentifier()) {
       if (mangler->shouldMangleDeclName(decl)) {