Bug 1779691 - Stop applying D116995 to clang-trunk. r=firefox-build-system-reviewers,andi

It was applied upstream.

Also rename the patch for clang-14, with its upstream-landed
description.

Differential Revision: https://phabricator.services.mozilla.com/D151900

build/build-clang/clang-14.json

@@ -8,7 +8,7 @@
         "Remove-FlushViewOfFile-when-unmaping-gcda-files.patch",
         "fuzzing_ccov_build_clang_12.patch",
         "win64-no-symlink.patch",
-        "D116995.diff",
+        "llvmorg-15-init-16512-g4b1e3d193706.patch",
         "revert-llvmorg-14-init-14141-gd6d3000a2f6d.patch",
         "revert-llvmorg-14-init-11890-gf86deb18cab6.patch"
     ]

build/build-clang/clang-trunk.json

@@ -7,7 +7,6 @@
         "bug47258-extract-symbols-mbcs.patch",
         "fuzzing_ccov_build_clang_12.patch",
         "win64-no-symlink.patch",
-        "D116995.diff",
         "revert-llvmorg-15-init-13446-g7524fe962e47.patch",
         "revert-llvmorg-14-init-14141-gd6d3000a2f6d.patch",
         "revert-llvmorg-14-init-11890-gf86deb18cab6.patch"

build/build-clang/llvmorg-15-init-16512-g4b1e3d193706.patch

@@ -1,4 +1,7 @@
-[gold] Ignore bitcode from sections inside object files
+From 8482662676a4b6ef79a718c8c09943cb15241664 Mon Sep 17 00:00:00 2001
+From: Tom Stellard <tstellar@redhat.com>
+Date: Tue, 21 Jun 2022 22:22:11 -0700
+Subject: [PATCH] [gold] Ignore bitcode from sections inside object files
 
 -fembed-bitcode will put bitcode into special sections within object
 files, but this is not meant to be used by LTO, so the gold plugin
@@ -6,8 +9,51 @@ should ignore it.
 
 https://github.com/llvm/llvm-project/issues/47216
 
+Reviewed By: tejohnson, MaskRay
+
+Differential Revision: https://reviews.llvm.org/D116995
+---
+ llvm/docs/BitCodeFormat.rst                   |  3 ++-
+ llvm/docs/GoldPlugin.rst                      |  4 ++++
+ .../tools/gold/X86/Inputs/bcsection-lib.ll    |  6 +++++
+ llvm/test/tools/gold/X86/Inputs/bcsection.s   |  5 ++++
+ llvm/test/tools/gold/X86/bcsection.ll         | 23 +++++++++++++++----
+ llvm/tools/gold/gold-plugin.cpp               |  8 +++++++
+ 6 files changed, 43 insertions(+), 6 deletions(-)
+ create mode 100644 llvm/test/tools/gold/X86/Inputs/bcsection-lib.ll
+
+diff --git a/llvm/docs/BitCodeFormat.rst b/llvm/docs/BitCodeFormat.rst
+index 8e81a7daa459..df1f6915d7d5 100644
+--- a/llvm/docs/BitCodeFormat.rst
++++ b/llvm/docs/BitCodeFormat.rst
+@@ -475,7 +475,8 @@ formats.  This wrapper format is useful for accommodating LTO in compilation
+ pipelines where intermediate objects must be native object files which contain
+ metadata in other sections.
+ 
+-Not all tools support this format.
++Not all tools support this format.  For example, lld and the gold plugin will
++ignore these sections when linking object files.
+ 
+ .. _encoding of LLVM IR:
+ 
+diff --git a/llvm/docs/GoldPlugin.rst b/llvm/docs/GoldPlugin.rst
+index ce310bc2cf3c..07d2fc203eba 100644
+--- a/llvm/docs/GoldPlugin.rst
++++ b/llvm/docs/GoldPlugin.rst
+@@ -17,6 +17,10 @@ and above also supports LTO via plugins.  However, usage of the LLVM
+ gold plugin with ld.bfd is not tested and therefore not officially
+ supported or recommended.
+ 
++As of LLVM 15, the gold plugin will ignore bitcode from the ``.llvmbc``
++section inside of ELF object files.  However, LTO with bitcode files
++is still supported.
++
+ .. _`gold linker`: http://sourceware.org/binutils
+ .. _`GCC LTO`: http://gcc.gnu.org/wiki/LinkTimeOptimization
+ .. _`gold plugin interface`: http://gcc.gnu.org/wiki/whopr/driver
 diff --git a/llvm/test/tools/gold/X86/Inputs/bcsection-lib.ll b/llvm/test/tools/gold/X86/Inputs/bcsection-lib.ll
 new file mode 100644
+index 000000000000..ef3557c19cdc
 --- /dev/null
 +++ b/llvm/test/tools/gold/X86/Inputs/bcsection-lib.ll
 @@ -0,0 +1,6 @@
@@ -18,6 +64,7 @@ new file mode 100644
 +  ret i32 0
 +}
 diff --git a/llvm/test/tools/gold/X86/Inputs/bcsection.s b/llvm/test/tools/gold/X86/Inputs/bcsection.s
+index ede1e5c532dd..c523612563b4 100644
 --- a/llvm/test/tools/gold/X86/Inputs/bcsection.s
 +++ b/llvm/test/tools/gold/X86/Inputs/bcsection.s
 @@ -1,2 +1,7 @@
@@ -29,6 +76,7 @@ diff --git a/llvm/test/tools/gold/X86/Inputs/bcsection.s b/llvm/test/tools/gold/
  .section .llvmbc
  .incbin "bcsection.bc"
 diff --git a/llvm/test/tools/gold/X86/bcsection.ll b/llvm/test/tools/gold/X86/bcsection.ll
+index 6d3481f8f966..09882d83fe91 100644
 --- a/llvm/test/tools/gold/X86/bcsection.ll
 +++ b/llvm/test/tools/gold/X86/bcsection.ll
 @@ -2,16 +2,29 @@
@@ -67,15 +115,16 @@ diff --git a/llvm/test/tools/gold/X86/bcsection.ll b/llvm/test/tools/gold/X86/bc
    ret i32 0
  }
 diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
+index 180c181368e3..294c7a3d6178 100644
 --- a/llvm/tools/gold/gold-plugin.cpp
 +++ b/llvm/tools/gold/gold-plugin.cpp
-@@ -540,6 +540,14 @@
+@@ -540,6 +540,14 @@ static ld_plugin_status claim_file_hook(const ld_plugin_input_file *file,
      BufferRef = Buffer->getMemBufferRef();
    }
  
 +  // Only use bitcode files for LTO.  InputFile::create() will load bitcode
-+  // from special sections within a binary object, this bitcode is typically
++  // from the .llvmbc section within a binary object, this bitcode is typically
-+  // generated by -fembed-bitcode and is not meant for LTO use.
++  // generated by -fembed-bitcode and is not to be used by LLVMgold.so for LTO.
 +  if (identify_magic(BufferRef.getBuffer()) != file_magic::bitcode) {
 +    *claimed = 0;
 +    return LDPS_OK;
@@ -84,4 +133,6 @@ diff --git a/llvm/tools/gold/gold-plugin.cpp b/llvm/tools/gold/gold-plugin.cpp
    *claimed = 1;
  
    Expected<std::unique_ptr<InputFile>> ObjOrErr = InputFile::create(BufferRef);
+-- 
+2.37.1.1.g659da70093