[clang][ifs] New interface stubs format (llvm triple based).

After posting llvm-ifs on phabricator, I made some progress in hardening up how
I think the format for Interface Stubs should look. There are a number of
things I think the TBE format was missing (no endianness, no info about the
Object Format because it assumes ELF), so I have added those and broken off
from being as similar to the TBE schema. In a subsequent commit I can drop the
other formats.

An example of how The format will look is as follows:

--- !experimental-ifs-v1
IfsVersion: 1.0
Triple: x86_64-unknown-linux-gnu
ObjectFileFormat: ELF
Symbols:
  _Z9nothiddenv: { Type: Func }
  _Z10cmdVisiblev: { Type: Func }
...

The format is still marked experimental.

Differential Revision: https://reviews.llvm.org/D66446

llvm-svn: 369715

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 690d4fa3fa4..7e420da94f0 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -3638,12 +3638,14 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
                   : "")
               .Case("experimental-yaml-elf-v1", "experimental-yaml-elf-v1")
               .Case("experimental-tapi-elf-v1", "experimental-tapi-elf-v1")
+              .Case("experimental-ifs-v1", "experimental-ifs-v1")
               .Default("");
 
       if (StubFormat.empty())
         D.Diag(diag::err_drv_invalid_value)
             << "Must specify a valid interface stub format type using "
             << "-interface-stub-version=<experimental-tapi-elf-v1 | "
+               "experimental-ifs-v1 | "
                "experimental-yaml-elf-v1>";
 
       CmdArgs.push_back("-emit-interface-stubs");