Implement parsing, AST, (de-)serialization, and placeholder global

metadata for linking against the libraries/frameworks for imported
modules.

The module map language is extended with a new "link" directive that
specifies what library or framework to link against when a module is
imported, e.g.,

  link "clangAST"

or

  link framework "MyFramework"

Importing the corresponding module (or any of its submodules) will
eventually link against the named library/framework.

For now, I've added some placeholder global metadata that encodes the
imported libraries/frameworks, so that we can test that this
information gets through to the IR. The format of the data is still
under discussion.

llvm-svn: 172437

1 files changed, 18 insertions, 0 deletions

diff --git a/clang/test/Modules/autolink.m b/clang/test/Modules/autolink.m
new file mode 100644
index 00000000000..e4db6991fca
--- /dev/null
+++ b/clang/test/Modules/autolink.m
@@ -0,0 +1,18 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -emit-llvm -o - -fmodule-cache-path %t -fmodules -F %S/Inputs -I %S/Inputs %s | FileCheck %s
+
+@import autolink.sub2;
+
+int f() {
+  return autolink_sub2();
+}
+
+@import autolink;
+
+int g() {
+  return autolink;
+}
+
+// CHECK: !llvm.link.libraries = !{![[AUTOLINK:[0-9]+]], ![[AUTOLINK_FRAMEWORK:[0-9]+]]}
+// CHECK: ![[AUTOLINK]] = metadata !{metadata !"autolink", i1 false}
+// CHECK: ![[AUTOLINK_FRAMEWORK]] = metadata !{metadata !"autolink_framework", i1 true}