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Always use consistent CXX_STANDARD

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Since CMake has subdirectory variable scope, unilaterally set the
CMAKE_CXX_STANDARD variable to use C++11. This covers cases with the
library being included externally, both in cases of only C++98 being
specified, as well as later versions being specified (since the
CXX_STANDARD itself isn't a library dependency, only the PUBLIC
target_compile_features on jsoncpp_lib). The previous direct check for
C++98 is handled by requiring C++11 on this library; should the
compiler being used not support C++11 then CMake will issue an error.
This commit is contained in:
Joel Johnson 2019-12-31 16:07:22 -07:00
parent edc6239f39
commit 12ceb01485
1 changed files with 5 additions and 18 deletions
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21
CMakeLists.txt
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@ -37,24 +37,11 @@ foreach(pold "") # Currently Empty
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)
# Build the library with C++11 standard support, independent from other including
# software which may use a different CXX_STANDARD or CMAKE_CXX_STANDARD.
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_EXTENSIONS OFF)
endif()
# ====
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# Ensure that CMAKE_BUILD_TYPE has a value specified for single configuration generators.
if(NOT DEFINED CMAKE_BUILD_TYPE AND NOT DEFINED CMAKE_CONFIGURATION_TYPES)