Set CMP0048 policy before project() to silence warnings (#750)

If this policy isn't set, CMake emits a large warning when project() is called from a cmake subdirectory. This came up when the benchmark library was added to the LLVM build, and it was reported in https://llvm.org/PR38874. This patch was the fix I applied locally to fix the issue, and I wanted to send it upstream.

Set CMP0048 policy before project() to silence warnings (#750)
dc106455 · Reid Kleckner · Roman Lebedev · 4528c76b · dc106455
Commit dc106455 authored Dec 30, 2018 by Reid Kleckner Committed by Roman Lebedev Dec 30, 2018
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CMakeLists.txt CMakeLists.txt +3 -2

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--- a/CMakeLists.txt
+++ b/CMakeLists.txt
 cmake_minimum_required (VERSION 2.8.12)

-project (benchmark)
-
 foreach(p
+    CMP0048 # OK to clear PROJECT_VERSION on project()
    CMP0054 # CMake 3.1
    CMP0056 # export EXE_LINKER_FLAGS to try_run
    CMP0057 # Support no if() IN_LIST operator
@@ -12,6 +11,8 @@ foreach(p
  endif()
 endforeach()

+project (benchmark)
+
 option(BENCHMARK_ENABLE_TESTING "Enable testing of the benchmark library." ON)
 option(BENCHMARK_ENABLE_EXCEPTIONS "Enable the use of exceptions in the benchmark library." ON)
 option(BENCHMARK_ENABLE_LTO "Enable link time optimisation of the benchmark library." OFF)