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[cmake] Require CMake 3.16 #292

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Jul 8, 2024
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[cmake] Require CMake 3.16 #292

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28 changes: 7 additions & 21 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
@@ -1,8 +1,6 @@
cmake_minimum_required(VERSION 2.8.12)

if (POLICY CMP0025)
cmake_policy(SET CMP0025 NEW)
endif()
# https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md
# As of 2024-07-01, CMake 3.16 is the minimum supported version.
cmake_minimum_required(VERSION 3.16)

project(cctz)

Expand Down Expand Up @@ -51,20 +49,12 @@ if (BUILD_TESTING)
)
endif()

# Starting from CMake >= 3.1, if a specific standard is required,
# If a specific standard is required,
# it can be set from the command line with:
# cmake -DCMAKE_CXX_STANDARD=[11|14|17]
# cmake -DCMAKE_CXX_STANDARD=[11|14|17|20|23]
function(cctz_target_set_cxx_standard target)
set(cxx_standard 11)
if (CMAKE_VERSION VERSION_LESS "3.1")
if (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
target_compile_options(${target} PRIVATE -std=c++${cxx_standard})
endif()
elseif (CMAKE_VERSION VERSION_LESS "3.8")
set_property(TARGET ${target} PROPERTY CXX_STANDARD ${cxx_standard})
else()
target_compile_features(${target} PUBLIC cxx_std_${cxx_standard})
endif()
target_compile_features(${target} PUBLIC cxx_std_${cxx_standard})
endfunction()

if(APPLE)
Expand Down Expand Up @@ -191,10 +181,6 @@ install(FILES cmake/${PROJECT_NAME}-config.cmake
DESTINATION ${CMAKE_INSTALL_CONFIGDIR}
)

if (CMAKE_VERSION VERSION_LESS "3.8")
set(quiet_on_empty "")
else()
set(quiet_on_empty QUIET_ON_EMPTY)
endif()
set(quiet_on_empty QUIET_ON_EMPTY)

feature_summary(WHAT ALL FATAL_ON_MISSING_REQUIRED_PACKAGES ${quiet_on_empty})