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Diffstat (limited to 'docs/users_guide/using-warnings.rst')
| -rw-r--r-- | docs/users_guide/using-warnings.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/users_guide/using-warnings.rst b/docs/users_guide/using-warnings.rst index 7f72b3eb20..3a2b4d5c84 100644 --- a/docs/users_guide/using-warnings.rst +++ b/docs/users_guide/using-warnings.rst @@ -14,6 +14,13 @@ of warnings. To turn off an individual warning ``-W<wflag>``, use ``-Wno-<wflag>``. To reverse ``-Werror``, which makes all warnings into errors, use ``-Wwarn``. +.. note:: + In GHC < 8 the syntax for ``-W<wflag>`` was ``-fwarn-<wflag>`` + (e.g. ``-fwarn-incomplete-patterns``). + This spelling is deprecated, but still accepted for backwards compatibility. + Likewise, ``-Wno-<wflag>`` used to be ``fno-warn-<wflag>`` + (e.g. ``-fno-warn-incomplete-patterns``). + .. ghc-flag:: -Wdefault :shortdesc: enable default flags |