Restore "Resolution-based LTO API."

This restores commit r278330, with fixes for a few bot failures:
- Fix a late change I had made to the save temps output file that I
  missed due to existing files sitting on my disk
- Fix a bunch of Windows bot failures with "ambiguous call to overloaded
  function" due to confusion between llvm::make_unique vs
  std::make_unique (preface the new make_unique calls with "llvm::")
- Attempt to fix a modules bot failure by adding a missing include
  to LTO/Config.h.

Original change:

Resolution-based LTO API.

Summary:
This introduces a resolution-based LTO API. The main advantage of this API over
existing APIs is that it allows the linker to supply a resolution for each
symbol in each object, rather than the combined object as a whole. This will
become increasingly important for use cases such as ThinLTO which require us
to process symbol resolutions in a more complicated way than just adjusting
linkage.

Patch by Peter Collingbourne.

Reviewers: rafael, tejohnson, mehdi_amini

Subscribers: lhames, tejohnson, mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D20268

llvm-svn: 278338

1 files changed, 11 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-lto2/errors.ll b/llvm/test/tools/llvm-lto2/errors.ll
new file mode 100644
index 00000000000..cd2394dc012
--- /dev/null
+++ b/llvm/test/tools/llvm-lto2/errors.ll
@@ -0,0 +1,11 @@
+; RUN: llvm-as %s -o %t.bc
+; RUN: not llvm-lto2 -o %t2.o %t.bc 2>&1 | FileCheck --check-prefix=ERR1 %s
+; RUN: not llvm-lto2 -o %t2.o -r %t.bc,foo,p -r %t.bc,bar,p %t.bc 2>&1 | FileCheck --check-prefix=ERR2 %s
+; RUN: not llvm-lto2 -o %t2.o -r %t.bc,foo,q %t.bc 2>&1 | FileCheck --check-prefix=ERR3 %s
+; RUN: not llvm-lto2 -o %t2.o -r foo %t.bc 2>&1 | FileCheck --check-prefix=ERR4 %s
+
+; ERR1: missing symbol resolution for {{.*}}.bc,foo
+; ERR2: unused symbol resolution for {{.*}}.bc,bar
+; ERR3: invalid character q in resolution: {{.*}}.bc,foo
+; ERR4: invalid resolution: foo
+@foo = global i32 0