fix warnings and update cmake#13

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sergio-eld wants to merge 9 commits intomaddouri:masterfrom

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Commits on May 26, 2021

added clean build option in cmake to disallow warnings

s.kolesnik
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moved enable_testing to the root directory as required by the cmake documentation. Otherwise ctest might not be included and no targets for test generated

s.kolesnik
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s.kolesnik
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added try-catch block for loader. Added check for input.

s.kolesnik
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s.kolesnik
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fixed test: using absolute path from cmake target property

s.kolesnik
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s.kolesnik
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fixed cmake to remove warnings

s.kolesnik
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s.kolesnik
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worked around function cast warning.

s.kolesnik
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s.kolesnik
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added conditional option to build tests. Tests must not be included when project added via add_subdirectory. if EXCLUDE_FROM_ALL is specified as an option in the parent cmake list, its tests will fail

s.kolesnik
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s.kolesnik
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modified conditional enable_testing()

s.kolesnik
authored and
s.kolesnik
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modified conditional enable_testing()

s.kolesnik
authored and
s.kolesnik
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