[CMake] Use write_basic_package_version_file for LLVM

Use the CMake 3.13 features of CMakeConfigPackageHelpers to generate
LLVMConfigVersion.cmake with proper architecture detection, major+minor
version matching, etc.

Differential Revision: https://reviews.llvm.org/D99451

diff --git a/llvm/cmake/modules/CMakeLists.txt b/llvm/cmake/modules/CMakeLists.txt
index 505dc9a..8276126 100644 (file)
--- a/llvm/cmake/modules/CMakeLists.txt
+++ b/llvm/cmake/modules/CMakeLists.txt
@@ -127,11 +127,13 @@ configure_file(
   ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/LLVMConfig.cmake
   @ONLY)
 
-# Generate LLVMConfigVersion.cmake for build and install tree.
-configure_file(
-  LLVMConfigVersion.cmake.in
-  ${llvm_cmake_builddir}/LLVMConfigVersion.cmake
-  @ONLY)
+# Generate LLVMConfigVersion.cmake for build tree (later copied to install tree).
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+  "${llvm_cmake_builddir}/LLVMConfigVersion.cmake"
+  VERSION "${PACKAGE_VERSION}"
+  COMPATIBILITY SameMinorVersion
+)
 
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   get_property(llvm_has_exports GLOBAL PROPERTY LLVM_HAS_EXPORTS)

diff --git a/llvm/cmake/modules/LLVMConfigVersion.cmake.in b/llvm/cmake/modules/LLVMConfigVersion.cmake.in
deleted file mode 100644 (file)
index e9ac4ed..0000000
--- a/llvm/cmake/modules/LLVMConfigVersion.cmake.in
+++ /dev/null
@@ -1,13 +0,0 @@
-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()