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Features: Decay language flag if requested is not available.

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Use the highest standard compile flags available if requested language
version is too new.

This supports use-cases like

 set(CMAKE_CXX_STANDARD 14)

 # Compiled with -std=c++11 with GNU 4.7, which has no -std=c++14
 # or equivalent flag
 add_executable(main main.cpp)

This can be used in combination with preprocessor defines which
communicate the availability of certain language features for
optional use.
This commit is contained in:
Stephen Kelly
2014-03-28 16:09:35 +01:00
parent c4f4dac2d5
commit 1df2116bfa
3 changed files with 57 additions and 9 deletions
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Help/prop_tgt/CXX_STANDARD.rst
+14 -2
View File
@@ -1,14 +1,26 @@
CXX_STANDARD
------------
The C++ standard whose features are required to build this target.
The C++ standard whose features are requested to build this target.
This property specifies the C++ standard whose features are required
This property specifies the C++ standard whose features are requested
to build this target. For some compilers, this results in adding a
flag such as ``-std=c++11`` to the compile line.
Supported values are ``98`` and ``11``.
If the value requested does not result in a compile flag being added for
the compiler in use, a previous standard flag will be added instead. This
means that using:
.. code-block:: cmake
set_property(TARGET tgt PROPERTY CXX_STANDARD 11)
with a compiler which does not support ``-std=c++11`` or an equivalent
flag will not result in an error or warning, but will instead add the
``-std=c++98`` flag if supported.
This property is initialized by the value of
the :variable:`CMAKE_CXX_STANDARD` variable if it is set when a target
is created.