From 0fa7dc4762d6fe0ab811f86e5d2c87231f2abcfe Mon Sep 17 00:00:00 2001
From: Eric Christopher <echristo@gmail.com>
Date: Wed, 16 Apr 2014 23:15:31 +0000
Subject: [PATCH] Teach LLVMConfigVersion.cmake to behave as find_package()
 expects.

Patch by Brad King

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206426 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/modules/LLVMConfigVersion.cmake.in | 14 +++++++++++++-
 cmake/modules/Makefile                   |  3 +++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/cmake/modules/LLVMConfigVersion.cmake.in b/cmake/modules/LLVMConfigVersion.cmake.in
index add5aa9a1cb..e9ac4ed2da7 100644
--- a/cmake/modules/LLVMConfigVersion.cmake.in
+++ b/cmake/modules/LLVMConfigVersion.cmake.in
@@ -1 +1,13 @@
-set(PACKAGE_VERSION "@PACKAGE_VERSION@")
\ No newline at end of file
+set(PACKAGE_VERSION "@PACKAGE_VERSION@")
+
+# LLVM is API-compatible only with matching major.minor versions
+# and patch versions not less than that requested.
+if("@LLVM_VERSION_MAJOR@.@LLVM_VERSION_MINOR@" VERSION_EQUAL
+    "${PACKAGE_FIND_VERSION_MAJOR}.${PACKAGE_FIND_VERSION_MINOR}"
+   AND NOT "@LLVM_VERSION_PATCH@" VERSION_LESS "${PACKAGE_FIND_VERSION_PATCH}")
+  set(PACKAGE_VERSION_COMPATIBLE 1)
+  if("@LLVM_VERSION_PATCH@" VERSION_EQUAL
+      "${PACKAGE_FIND_VERSION_PATCH}")
+    set(PACKAGE_VERSION_EXACT 1)
+  endif()
+endif()
diff --git a/cmake/modules/Makefile b/cmake/modules/Makefile
index 817f911ea7c..265c1f8ec14 100644
--- a/cmake/modules/Makefile
+++ b/cmake/modules/Makefile
@@ -52,6 +52,9 @@ $(PROJ_OBJ_DIR)/LLVMConfigVersion.cmake: LLVMConfigVersion.cmake.in
 	$(Echo) 'Generating LLVM CMake package version file'
 	$(Verb) cat $< | sed \
 	  -e 's/@PACKAGE_VERSION@/'"$(LLVMVersion)"'/' \
+	  -e 's/@LLVM_VERSION_MAJOR@/'"$(LLVM_VERSION_MAJOR)"'/' \
+	  -e 's/@LLVM_VERSION_MINOR@/'"$(LLVM_VERSION_MINOR)"'/' \
+	  -e 's/@LLVM_VERSION_PATCH@/'"$(LLVM_VERSION_PATCH)"'/' \
 	  > $@
 
 $(PROJ_OBJ_DIR)/LLVMExports.cmake: $(LLVMBuildCMakeExportsFrag)
-- 
2.34.1