IN_TRY_COMPILE

Read-only property that is true during a try-compile configuration.

True when building a project inside a try_compile() or try_run() command.

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© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.6/prop_gbl/IN_TRY_COMPILE.html