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Help: presets: add note for ExternalProject users with env vars

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Although this behavior is implied in the existing help text, I think
this use case is common and could be puzzling to those who do not
thoroughly read the existing help text. I think that warrants
a "Note:" on this page.
This commit is contained in:
Michael Hirsch
2021-06-08 10:46:16 -04:00
committed by Brad King
parent acb25d50d9
commit b00512e692
1 changed files with 13 additions and 0 deletions
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Help/manual/cmake-presets.7.rst
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@@ -401,6 +401,19 @@ that may contain the following fields:
are applied. Setting a variable to ``null`` causes it to not be set, are applied. Setting a variable to ``null`` causes it to not be set,
even if a value was inherited from another preset. even if a value was inherited from another preset.
.. note::
For a CMake project using ExternalProject with a configuration preset
having environment variables needed in the ExternalProject, use a build
preset that inherits that configuration preset or the ExternalProject
will not have the environment variables set in the configuration preset.
Example: suppose the host defaults to one compiler (say Clang)
and the user wishes to use another compiler (say GCC). Set configuration
preset environment variables ``CC`` and ``CXX`` and use a build preset
that inherits that configuration preset. Otherwise the ExternalProject
may use a different (system default) compiler than the top-level CMake
project.
``configurePreset`` ``configurePreset``
An optional string specifying the name of a configure preset to An optional string specifying the name of a configure preset to