[cmake] Make include(GNUInstallDirs) always below project(..)
Its defaulting logic must go after `project(..)` to work correctly, but `project(..)` is often in a standalone condition making this
awkward, since the rest of the condition code may also need GNUInstallDirs.
The good thing is there are the various standalone booleans, which I had missed before. This makes splitting the conditional blocks less awkward.
Reviewed By: arichardson, phosek, beanz, ldionne, #libunwind, #libc, #libc_abi
Differential Revision: https://reviews.llvm.org/D117639
GitOrigin-RevId: df31ff1b29bc4c2308ec5df8a7ff0ec2ab0942d4
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6bcc8f..6a6e78b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,10 +1,14 @@
-include(GNUInstallDirs)
-
# Check if this is a in tree build.
if (NOT DEFINED LLVM_MAIN_SRC_DIR)
project(Polly)
cmake_minimum_required(VERSION 3.13.4)
+ set(POLLY_STANDALONE_BUILD TRUE)
+endif()
+# Must go below project(..)
+include(GNUInstallDirs)
+
+if(POLLY_STANDALONE_BUILD)
# Where is LLVM installed?
find_package(LLVM CONFIG REQUIRED)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${LLVM_CMAKE_DIR})
