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Add options to build CMake without latest language dialects 

Set CMAKE_C_STANDARD and CMAKE_CXX_STANDARD only if they are not
already defined.  This will allow users to add the settings with
different values to their local cache (e.g. on the command line).
This commit is contained in:
Brad King 2014-12-05 14:06:43 -05:00
parent ce28da6c64
commit de022e8908
1 changed files with 6 additions and 2 deletions
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8
CMakeLists.txt
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@ -37,8 +37,12 @@ if("${CMake_SOURCE_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}")
endif()
# Use most-recent available language dialects with GNU and Clang
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 14)
if(NOT DEFINED CMAKE_C_STANDARD)
set(CMAKE_C_STANDARD 11)
endif()
if(NOT DEFINED CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 14)
endif()
# option to set the internal encoding of CMake to UTF-8
option(CMAKE_ENCODING_UTF8 "Use UTF-8 encoding internally (experimental)." OFF)