cmTarget: Add CXX_STANDARD and CXX_EXTENSION target properties.

These are used to determine whether to add -std=c++11, -std=gnu++11
etc flags on the compile line.

2 files changed, 22 insertions, 0 deletions

diff --git a/Help/prop_tgt/CXX_EXTENSIONS.rst b/Help/prop_tgt/CXX_EXTENSIONS.rst
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+++ b/Help/prop_tgt/CXX_EXTENSIONS.rst
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+CXX_EXTENSIONS
+--------------
+
+Boolean specifying whether compiler specific extensions are requested.
+
+This property specifies whether compiler specific extensions should be
+used.  For some compilers, this results in adding a flag such
+as ``-std=gnu++11`` instead of ``-std=c++11`` to the compile line.
diff --git a/Help/prop_tgt/CXX_STANDARD.rst b/Help/prop_tgt/CXX_STANDARD.rst
new file mode 100644
index 0000000..e1b6e78
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+++ b/Help/prop_tgt/CXX_STANDARD.rst
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+CXX_STANDARD
+------------
+
+The C++ standard whose features are required to build this target.
+
+This property specifies the C++ standard whose features are required
+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``.
+
+This property is initialized by the value of
+the :variable:`CMAKE_CXX_STANDARD` variable if it is set when a target
+is created.