buildsystem: relax requirement on cmake version

Commit 73cc5089 (Using target_compile_features to specify C++ 11 standard) bumped the required cmake version, from 3.0 to 3.8, so as to get the definition of target_compile_features(). However, target_compile_features() was introduced in cmake-3.1: https://cmake.org/cmake/help/v3.1/command/target_compile_features.html And using cmake-3.1 is indeed sufficient to properly build. As such, relax the minimum required version down to cmake-3.1, so we can build on oldish, entreprise-grade distributions that only have cmake-3.1 (or at least, don't have up to cmake-3.8). Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

buildsystem: relax requirement on cmake version
e8b6b7ad · Yann E. MORIN · c682b987 · e8b6b7ad · e8b6b7ad · e8b6b7ad
Commit e8b6b7ad authored Dec 31, 2018 by Yann E. MORIN
5 changed files
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)

 ##
 ## PROJECT

--- a/benchmarks/CMakeLists.txt
+++ b/benchmarks/CMakeLists.txt
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)
 project(JSON_Benchmarks LANGUAGES CXX)

 # set compiler flags

--- a/test/cmake_add_subdirectory/project/CMakeLists.txt
+++ b/test/cmake_add_subdirectory/project/CMakeLists.txt
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)

 project(DummyImport CXX)


--- a/test/cmake_import/project/CMakeLists.txt
+++ b/test/cmake_import/project/CMakeLists.txt
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)

 project(DummyImport CXX)


--- a/test/cmake_import_minver/project/CMakeLists.txt
+++ b/test/cmake_import_minver/project/CMakeLists.txt
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)

 project(DummyImportMinVer CXX)