CMAKE_EXPORT_COMPILE_COMMANDS

This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

The default value for CMAKE_EXPORT_COMPILE_COMMANDS when there is no explicit configuration given on the first run while creating a new build tree. On later runs in an existing build tree the value persists in the cache as CMAKE_EXPORT_COMPILE_COMMANDS.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.17/envvar/CMAKE_EXPORT_COMPILE_COMMANDS.html