buildsystem: relax requirement on cmake version

Commit 73cc508 (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 <[email protected]> Signed-off-by: "Yann E. MORIN" <[email protected]>
nlohmann · Dec 31, 2018 · e8b6b7a · e8b6b7a
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commit e8b6b7a
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diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)
 
 ##
 ## PROJECT

diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)
 project(JSON_Benchmarks LANGUAGES CXX)
 
 # set compiler flags

diff --git a/test/cmake_add_subdirectory/project/CMakeLists.txt b/test/cmake_add_subdirectory/project/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)
 
 project(DummyImport CXX)
 

diff --git a/test/cmake_import/project/CMakeLists.txt b/test/cmake_import/project/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)
 
 project(DummyImport CXX)
 

diff --git a/test/cmake_import_minver/project/CMakeLists.txt b/test/cmake_import_minver/project/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.8)
+cmake_minimum_required(VERSION 3.1)
 
 project(DummyImportMinVer CXX)