/usr/share/cmake-3.5/Modules/Compiler/GNU-C.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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | include(Compiler/GNU)
__compiler_gnu(C)
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.5)
set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c89")
set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu89")
endif()
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
endif()
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.7)
set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
elseif (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c1x")
set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu1x")
endif()
if(NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
if (NOT CMAKE_C_COMPILER_FORCED)
if (NOT CMAKE_C_STANDARD_COMPUTED_DEFAULT)
message(FATAL_ERROR "CMAKE_C_STANDARD_COMPUTED_DEFAULT should be set for ${CMAKE_C_COMPILER_ID} (${CMAKE_C_COMPILER}) version ${CMAKE_C_COMPILER_VERSION}")
endif()
set(CMAKE_C_STANDARD_DEFAULT ${CMAKE_C_STANDARD_COMPUTED_DEFAULT})
elseif(NOT DEFINED CMAKE_C_STANDARD_DEFAULT)
# Compiler id was forced so just guess the default standard level.
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.0)
set(CMAKE_C_STANDARD_DEFAULT 11)
else()
set(CMAKE_C_STANDARD_DEFAULT 90)
endif()
endif()
endif()
macro(cmake_record_c_compile_features)
macro(_get_gcc_features std_version list)
record_compiler_features(C "${std_version}" ${list})
endmacro()
set(_result 0)
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.6)
_get_gcc_features(${CMAKE_C11_STANDARD_COMPILE_OPTION} CMAKE_C11_COMPILE_FEATURES)
endif()
if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 4.4)
if (_result EQUAL 0)
_get_gcc_features(${CMAKE_C99_STANDARD_COMPILE_OPTION} CMAKE_C99_COMPILE_FEATURES)
endif()
if (_result EQUAL 0)
_get_gcc_features(${CMAKE_C90_STANDARD_COMPILE_OPTION} CMAKE_C90_COMPILE_FEATURES)
endif()
endif()
endmacro()
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