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75 lines
2.8 KiB
75 lines
2.8 KiB
# @HEADER
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# ************************************************************************
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#
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# TriBITS: Tribal Build, Integrate, and Test System
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# Copyright 2013 Sandia Corporation
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#
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# Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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# the U.S. Government retains certain rights in this software.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the Corporation nor the names of the
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# ************************************************************************
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# @HEADER
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include(SetDefault)
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include(PrintVar)
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# @MACRO: set_default_and_from_env()
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#
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# Set a default value for a local variable and override from an environment
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# variable of the same name if it is set.
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#
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# Usage::
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#
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# set_default_and_from_env(<varName> <defaultVal>)
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#
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# First calls ``set_default(<varName> <defaultVal>)`` and then looks for an
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# environment variable named ``<varName>``, and if non-empty then overrides
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# the value of the local variable ``<varName>``.
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#
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# This macro is primarily used in CTest code to provide a way to pass in the
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# value of CMake variables. Older versions of ``ctest`` did not support the
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# option ``-D <var>:<type>=<value>`` to allow variables to be set through the
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# command-line like ``cmake`` always allowed.
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#
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macro(set_default_and_from_env VAR DEFAULT_VAL)
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set_default(${VAR} "${DEFAULT_VAL}")
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set(ENV_${VAR} $ENV{${VAR}})
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if (NOT "${ENV_${VAR}}" STREQUAL "")
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print_var(ENV_${VAR})
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set(${VAR} ${ENV_${VAR}})
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endif()
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print_var(${VAR})
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endmacro()
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