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cmake: Allow CMAKE_BUILD_TYPE to be set by environment variable

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When no `CMAKE_BUILD_TYPE` is explicitly specified while creating a new
build tree, check for an environment variable of the same name.

Issue: #20983
This commit is contained in:
Brad King
2021-06-29 13:34:28 -04:00
parent 6986a382a9
commit e216b9bbd3
10 changed files with 49 additions and 2 deletions
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5
Help/variable/CMAKE_BUILD_TYPE.rst
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@@ -26,8 +26,9 @@ value of ``CMAKE_BUILD_TYPE`` will be ``ReLeAsE``.
This variable is initialized by the first :command:`project` or
:command:`enable_language` command called in a project when a new build
tree is first created. A toolchain-specific default is chosen when a
language is enabled.
tree is first created. If the :envvar:`CMAKE_BUILD_TYPE` environment
variable is set, its value is used. Otherwise, a toolchain-specific
default is chosen when a language is enabled.
See :variable:`CMAKE_CONFIGURATION_TYPES` for specifying the configuration
with multi-config generators.