1CMP0115
2-------
3
4.. versionadded:: 3.20
5
6Source file extensions must be explicit.
7
8In CMake 3.19 and below, if a source file could not be found by the name
9specified, it would append a list of known extensions to the name to see if
10the file with the extension could be found. For example, this would allow the
11user to run:
12
13.. code-block:: cmake
14
15  add_executable(exe main)
16
17and put ``main.c`` in the executable without specifying the extension.
18
19Starting in CMake 3.20, CMake prefers all source files to have their extensions
20explicitly listed:
21
22.. code-block:: cmake
23
24  add_executable(exe main.c)
25
26The ``OLD`` behavior for this policy is to implicitly append known extensions
27to source files if they can't be found. The ``NEW`` behavior of this policy is
28to not append known extensions and require them to be explicit.
29
30This policy was introduced in CMake version 3.20.  CMake version |release|
31warns when the policy is not set and uses ``OLD`` behavior. Use the
32:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
33
34.. include:: DEPRECATED.txt
35