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file(GENERATE): Add policy CMP0070 to define relative path behavior

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Previously `file(GENERATE)` did not define any behavior for relative
paths given to the `OUTPUT` or `INPUT` arguments.  Define behavior
consistent with CMake conventions and add a policy to provide
compatibility for projects that relied on the old accidental behavior.

Fixes: #16786
This commit is contained in:
Brad King
2017-06-08 11:54:03 -04:00
parent 69050f4d16
commit 82be694c7a
17 changed files with 201 additions and 3 deletions
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Help/command/file.rst
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@@ -291,6 +291,8 @@ from the input content to produce the output content. The options are:
``INPUT <input-file>``
Use the content from a given file as input.
A relative path is treated with respect to the value of
:variable:`CMAKE_CURRENT_SOURCE_DIR`. See policy :policy:`CMP0070`.
``OUTPUT <output-file>``
Specify the output file name to generate. Use generator expressions
@@ -298,6 +300,9 @@ from the input content to produce the output content. The options are:
name. Multiple configurations may generate the same output file only
if the generated content is identical. Otherwise, the ``<output-file>``
must evaluate to an unique name for each configuration.
A relative path (after evaluating generator expressions) is treated
with respect to the value of :variable:`CMAKE_CURRENT_BINARY_DIR`.
See policy :policy:`CMP0070`.
Exactly one ``CONTENT`` or ``INPUT`` option must be given. A specific
``OUTPUT`` file may be named by at most one invocation of ``file(GENERATE)``.