/usr/share/cmake-3.5/Modules/Compiler/GNU-CXX.cmake is in cmake-data 3.5.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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__compiler_gnu(CXX)
if (WIN32)
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.6)
set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fno-keep-inline-dllexport")
endif()
else()
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.2)
set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
endif()
endif()
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
# Supported since 4.3
set(CMAKE_CXX98_STANDARD_COMPILE_OPTION "-std=c++98")
set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.7)
set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++11")
set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
# 4.3 supports 0x variants
set(CMAKE_CXX11_STANDARD_COMPILE_OPTION "-std=c++0x")
set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++0x")
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++14")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++14")
elseif (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
set(CMAKE_CXX14_STANDARD_COMPILE_OPTION "-std=c++1y")
set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++1y")
endif()
if(NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
if (NOT CMAKE_CXX_COMPILER_FORCED)
if (NOT CMAKE_CXX_STANDARD_COMPUTED_DEFAULT)
message(FATAL_ERROR "CMAKE_CXX_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_CXX_COMPILER_ID} (${CMAKE_CXX_COMPILER}) version ${CMAKE_CXX_COMPILER_VERSION}")
endif()
set(CMAKE_CXX_STANDARD_DEFAULT ${CMAKE_CXX_STANDARD_COMPUTED_DEFAULT})
elseif(NOT DEFINED CMAKE_CXX_STANDARD_DEFAULT)
# Compiler id was forced so just guess the default standard level.
set(CMAKE_CXX_STANDARD_DEFAULT 98)
endif()
endif()
macro(cmake_record_cxx_compile_features)
macro(_get_gcc_features std_version list)
record_compiler_features(CXX "${std_version}" ${list})
endmacro()
set(_result 0)
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.8)
_get_gcc_features(${CMAKE_CXX14_STANDARD_COMPILE_OPTION} CMAKE_CXX14_COMPILE_FEATURES)
endif()
if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.4)
if (_result EQUAL 0)
_get_gcc_features(${CMAKE_CXX11_STANDARD_COMPILE_OPTION} CMAKE_CXX11_COMPILE_FEATURES)
endif()
if (_result EQUAL 0)
_get_gcc_features(${CMAKE_CXX98_STANDARD_COMPILE_OPTION} CMAKE_CXX98_COMPILE_FEATURES)
endif()
endif()
endmacro()
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