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[CMake] Change the WARNINGS_AS_ERRORS option from BOOL to STRING

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to allow a new mode `SERIOUS_ONLY`.

Modes:

`ON` - All warnings are treated as errors (same as before)
`OFF` - Warnings are not treated as errors (same as before)
`SERIOUS_ONLY` - A subset of "serious" warnings are treated as errors.

Upgrade code is included to upgrade old CMake cache's to use the new
type of `WARNINGS_AS_ERRORS`. We should remove it eventually. The
user's previous setting is preserved when doing this.

Very few warnings are treated as errors for now. Developers can
add more later as they see fit.
This commit is contained in:
Dan Liew 2017-07-09 14:21:27 +01:00
parent 2af08a378d
commit 6e2ca69654
3 changed files with 111 additions and 8 deletions
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12
README-CMake.md
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@ -266,6 +266,8 @@ The following useful options can be passed to CMake whilst configuring.
Disabling this is useful for faster incremental builds. The documentation can be manually built by invoking the ``api_docs`` target.
* ``LINK_TIME_OPTIMIZATION`` - BOOL. If set to ``TRUE`` link time optimization will be enabled.
* ``API_LOG_SYNC`` - BOOL. If set to ``TRUE`` will enable experimental API log sync feature.
* ``WARNINGS_AS_ERRORS`` - STRING. If set to ``TRUE`` compiler warnings will be treated as errors. If set to ``False`` compiler warnings will not be treated as errors.
If set to ``SERIOUS_ONLY`` a subset of compiler warnings will be treated as errors.
On the command line these can be passed to ``cmake`` using the ``-D`` option. In ``ccmake`` and ``cmake-gui`` these can be set in the user interface.
@ -381,3 +383,13 @@ It is tempting use file-globbing in ``CMakeLists.txt`` to find a set for files m
use them as the sources to build a target. This however is a bad idea because it prevents CMake from knowing when it needs to rerun itself. This is why source file names are explicitly listed in the ``CMakeLists.txt`` so that when changes are made the source files used to build a target automatically triggers a rerun of CMake.
Long story short. Don't use file globbing.
### Serious warning flags
By default the `WARNINGS_AS_ERRORS` flag is set to `SERIOUS_ONLY` which means
some warnings will be treated as errors. These warnings are controlled by the
relevant `*_WARNINGS_AS_ERRORS` list defined in
`cmake/compiler_warnings.cmake`.
Additional warnings should only be added here if the warnings has no false
positives.