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document usage of compiler flags properties

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Denis Davydov 2016-05-05 11:56:58 +02:00
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lib/spack/docs/packaging_guide.rst
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@ -1831,6 +1831,25 @@ successfully find ``libdwarf.h`` and ``libdwarf.so``, without the
packager having to provide ``--with-libdwarf=/path/to/libdwarf`` on
the command line.
Compiler flags
~~~~~~~~~~~~~~
In rare circumstances such as compiling and running small unit tests, a package
developer may need to know what are the appropriate compiler flags to enable
features like ``OpenMP``, ``c++11``, ``c++14`` and alike. To that end the
compiler classes in ``spack`` implement the following _properties_ :
``openmp_flag``, ``cxx11_flag``, ``cxx14_flag``, which can be accessed in a
package by ``self.compiler.cxx11_flag`` and alike. Note that the implementation
is such that if a given compiler version does not support this feature, an
error will be produced. Therefore package developers can also use these properties
to assert that a compiler supports the requested feature. This is handy when a
package supports additional variants like
.. code-block:: python
variant('openmp', default=True, description="Enable OpenMP support.")
Message Parsing Interface (MPI)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It is common for high performance computing software/packages to use ``MPI``.