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ENH: Provide range for non-warned cmake versions

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Allow configuring without cmake policy developer warnings
for a range of cmake versions.

This prevents the need to explicitly enumerate every new
policy for each new cmake version.

===

Moved setting of the CMAKE_CXX_STANDARD to before the project()
directive.
This commit is contained in:
Hans Johnson 2018-12-12 10:02:42 -06:00 committed by Christopher Dunn
parent 892a386018
commit b3b92df879
1 changed files with 55 additions and 7 deletions
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62
CMakeLists.txt
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@ -1,6 +1,60 @@
# vim: et ts=4 sts=4 sw=4 tw=0
cmake_minimum_required(VERSION 3.1)
# ==== Define cmake build policies that affect compilation and linkage default behaviors
#
# Set the JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION string to the newest cmake version
# policies that provide successful builds. By setting JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION
# to a value greater than the oldest policies, all policies between
# JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION and CMAKE_VERSION (used for this build)
# are set to their NEW behaivor, thereby suppressing policy warnings related to policies
# between the JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION and CMAKE_VERSION.
#
# CMake versions greater than the JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION policies will
# continue to generate policy warnings "CMake Warning (dev)...Policy CMP0XXX is not set:"
#
set(JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION "3.1.0")
set(JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION "3.13.1")
cmake_minimum_required(VERSION ${JSONCPP_OLDEST_VALIDATED_POLICIES_VERSION} FATAL_ERROR)
if("${CMAKE_VERSION}" VERSION_LESS_EQUAL "${JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION}")
#Set and use the newest available cmake policies that are validated to work
set(JSONCPP_CMAKE_POLICY_VERSION "${CMAKE_VERSION}")
else()
set(JSONCPP_CMAKE_POLICY_VERSION "${JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION}")
endif()
cmake_policy(VERSION ${JSONCPP_CMAKE_POLICY_VERSION})
#
# Now enumerate specific policies newer than JSONCPP_NEWEST_VALIDATED_POLICIES_VERSION
# that may need to be individually set to NEW/OLD
#
foreach(pnew "") # Currently Empty
if(POLICY ${pnew})
cmake_policy(SET ${pnew} NEW)
endif()
endforeach()
foreach(pold "") # Currently Empty
if(POLICY ${pold})
cmake_policy(SET ${pold} OLD)
endif()
endforeach()
# ==== Define language standard configurations requiring at least c++11 standard
if(CMAKE_CXX_STANDARD EQUAL "98" )
message(FATAL_ERROR "CMAKE_CXX_STANDARD:STRING=98 is not supported.")
endif()
#####
## Set the default target properties
if(NOT CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 11) # Supported values are ``11``, ``14``, and ``17``.
endif()
if(NOT CMAKE_CXX_STANDARD_REQUIRED)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
if(NOT CMAKE_CXX_EXTENSIONS)
set(CMAKE_CXX_EXTENSIONS OFF)
endif()
# ====
# Ensures that CMAKE_BUILD_TYPE has a default value
if(NOT DEFINED CMAKE_BUILD_TYPE)
@ -73,12 +127,6 @@ if(MSVC)
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /W4 ")
endif()
# Require C++11 support, prefer ISO C++ over GNU variants,
# as relying solely on ISO C++ is more portable.
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
# using regular Clang or AppleClang
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wconversion -Wshadow -Werror=conversion -Werror=sign-compare")