llvm: sort the lists in generated source reproducibibly

(From OE-Core rev: e2e230bd7ad73a57bfb6808a3c537f74f35e2378)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 33 insertions, 1 deletions

diff --git a/meta/recipes-devtools/llvm/llvm/0001-AsmMatcherEmitter-sort-ClassInfo-lists-by-name-as-we.patch b/meta/recipes-devtools/llvm/llvm/0001-AsmMatcherEmitter-sort-ClassInfo-lists-by-name-as-we.patch
new file mode 100644
index 0000000000..20eea060b1
--- /dev/null
+++ b/meta/recipes-devtools/llvm/llvm/0001-AsmMatcherEmitter-sort-ClassInfo-lists-by-name-as-we.patch
@@ -0,0 +1,31 @@
+From 86940d87026432683fb6741cd8a34d3b9b18e40d Mon Sep 17 00:00:00 2001
+From: Alexander Kanavin <alex.kanavin@gmail.com>
+Date: Fri, 27 Nov 2020 10:11:08 +0000
+Subject: [PATCH] AsmMatcherEmitter: sort ClassInfo lists by name as well
+
+Otherwise, there are instances which are identical in
+every other field and therefore sort non-reproducibly
+(which breaks binary and source reproducibiliy).
+
+Upstream-Status: Pending
+Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
+---
+ llvm/utils/TableGen/AsmMatcherEmitter.cpp | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/llvm/utils/TableGen/AsmMatcherEmitter.cpp b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
+index ccf0959389b..1f801e83b7d 100644
+--- a/llvm/utils/TableGen/AsmMatcherEmitter.cpp
++++ b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
+@@ -359,7 +359,10 @@ public:
+     // name of a class shouldn't be significant. However, some of the backends
+     // accidentally rely on this behaviour, so it will have to stay like this
+     // until they are fixed.
+-    return ValueName < RHS.ValueName;
++    if (ValueName != RHS.ValueName)
++        return ValueName < RHS.ValueName;
++    // All else being equal, we should sort by name, for source and binary reproducibility
++    return Name < RHS.Name;
+   }
+ };
+ 
diff --git a/meta/recipes-devtools/llvm/llvm_git.bb b/meta/recipes-devtools/llvm/llvm_git.bb
index b146d0e6e3..43395f8cfc 100644
--- a/meta/recipes-devtools/llvm/llvm_git.bb
+++ b/meta/recipes-devtools/llvm/llvm_git.bb
@@ -33,7 +33,8 @@ SRCREV = "ef32c611aa214dea855364efd7ba451ec5ec3f74"
 SRC_URI = "git://github.com/llvm/llvm-project.git;branch=${BRANCH} \
            file://0006-llvm-TargetLibraryInfo-Undefine-libc-functions-if-th.patch;striplevel=2 \
            file://0007-llvm-allow-env-override-of-exe-path.patch;striplevel=2 \
-          "
+           file://0001-AsmMatcherEmitter-sort-ClassInfo-lists-by-name-as-we.patch;striplevel=2 \
+           "
 
 UPSTREAM_CHECK_GITTAGREGEX = "llvmorg-(?P<pver>\d+(\.\d+)+)"