[clang][ifs] Clang Interface Stubs ToolChain plumbing.

Second Landing Attempt:

This patch enables end to end support for generating ELF interface stubs
directly from clang. Now the following:

clang -emit-interface-stubs -o libfoo.so a.cpp b.cpp c.cpp

will product an ELF binary with visible symbols populated. Visibility attributes
and -fvisibility can be used to control what gets populated.

* Adding ToolChain support for clang Driver IFS Merge Phase
* Implementing a default InterfaceStubs Merge clang Tool, used by ToolChain
* Adds support for the clang Driver to involve llvm-ifs on ifs files.
* Adds -emit-merged-ifs flag, to tell llvm-ifs to emit a merged ifs text file
  instead of the final object format (normally ELF)


Differential Revision: https://reviews.llvm.org/D63978

llvm-svn: 374061

1 files changed, 0 insertions, 14 deletions

diff --git a/clang/test/InterfaceStubs/object.cpp b/clang/test/InterfaceStubs/object.cpp
deleted file mode 100644
index 7f11fe6bf3c..00000000000
--- a/clang/test/InterfaceStubs/object.cpp
+++ /dev/null
@@ -1,14 +0,0 @@
-// REQUIRES: x86-registered-target
-// RUN: %clang -target x86_64-unknown-linux-gnu -o - -emit-interface-stubs \
-// RUN: -interface-stub-version=experimental-ifs-v1 %s | \
-// RUN: FileCheck -check-prefix=CHECK-TAPI %s
-
-// RUN: %clang -target x86_64-unknown-linux-gnu -o - -emit-interface-stubs \
-// RUN: -interface-stub-version=experimental-ifs-v1 %s | \
-// RUN: FileCheck -check-prefix=CHECK-SYMBOLS %s
-// RUN: %clang -target x86_64-unknown-linux-gnu -o - -c %s | llvm-nm - 2>&1 | \
-// RUN: FileCheck -check-prefix=CHECK-SYMBOLS %s
-
-// CHECK-TAPI: data: { Type: Object, Size: 4 }
-// CHECK-SYMBOLS: data
-int data = 42;