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Bump up the minimum cmake version to 3.9.

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This gets us up to a version that supports features we're already using
(i.e. add_compile_options), but stops short of a cmake that requires
c++11, which some OSes still don't support.
Closes issue #774
This commit is contained in:
Eric Haszlakiewicz
2023-02-23 01:01:14 +00:00
parent 1741bcd3ea
commit d1716fe431
1 changed files with 18 additions and 32 deletions
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50
CMakeLists.txt
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@@ -1,41 +1,26 @@
# Many projects still are stuck using CMake 2.8 in several places so it's good to provide backward support too. This is
# specially true in old embedded systems (OpenWRT and friends) where CMake isn't necessarily upgraded.
# We set it to 2.8.12 as CMake currently indicates that support for versions below it will be removed
# from a future version ("Compatibility with CMake < 2.8.12 will be removed from a future version of CMake.")
# 2.8.12 was released in 2013.
cmake_minimum_required(VERSION 2.8.12)
# CMake 3.9 was released in 2017/07
# As of 2023, many versions of Linux, NetBSD and FreeBSD provide,
# and many OpenWRT packages require, much newer CMake packages.
# We're stopping before 3.10 because that version starts requiring
# c++11, which isn't available on e.g HPUX.
cmake_minimum_required(VERSION 3.9)
if(POLICY CMP0048)
cmake_policy(SET CMP0048 NEW)
endif()
# The project() command manages VERSION variables.
cmake_policy(SET CMP0048 NEW)
# JSON-C library is C only project.
if (CMAKE_VERSION VERSION_LESS 3.0)
project(json-c)
set(PROJECT_VERSION_MAJOR "0")
set(PROJECT_VERSION_MINOR "16")
set(PROJECT_VERSION_PATCH "99")
set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
else()
project(json-c LANGUAGES C VERSION 0.16.99)
endif()
# PROJECT_VERSION{,_MAJOR,_MINOR,_PATCH} set by project():
project(json-c LANGUAGES C VERSION 0.16.99)
# If we've got 3.0 then it's good, let's provide support. Otherwise, leave it be.
if(POLICY CMP0038)
# Policy CMP0038 was introduced in CMake 3.0
cmake_policy(SET CMP0038 NEW)
endif()
# Targets may not link directly to themselves.
cmake_policy(SET CMP0038 NEW)
if(POLICY CMP0042)
# Policy CMP0042 was introduced in CMake 3.0
# CMake version 3.25.1 warns when the policy is not set and uses OLD behavior
# We set it explicitly to avoid the warning
cmake_policy(SET CMP0042 OLD)
endif()
# MACOSX_RPATH is enabled by default.
# We set it explicitly to avoid the warning
cmake_policy(SET CMP0042 NEW)
if(POLICY CMP0054)
cmake_policy(SET CMP0054 NEW)
endif()
# Only interpret if() arguments as variables or keywords when unquoted.
cmake_policy(SET CMP0054 NEW)
# set default build type if not specified by user
if(NOT CMAKE_BUILD_TYPE)
@@ -46,6 +31,7 @@ set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O2")
# Include file check macros honor CMAKE_REQUIRED_LIBRARIES
# i.e. the check_include_file() calls will include -lm when checking.
# New in version 3.12.
if(POLICY CMP0075)
cmake_policy(SET CMP0075 NEW)
endif()