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| author | Michael Kruse <llvm-project@meinersbur.de> | 2022-03-02 12:47:42 -0600 |
|---|---|---|
| committer | Michael Kruse <llvm-project@meinersbur.de> | 2022-03-02 13:01:28 -0600 |
| commit | 261253aa60cc10f21788fb55ae27152242a65989 (patch) | |
| tree | 7080873c559ffc926be1458cd6d23ef1d3a5437c | |
| parent | 967296bfefee9740b1dfb4644970d776e1b37b5b (diff) | |
[Clang][docs] Add preprocessor changes to ReleaseNotes.
| -rw-r--r-- | clang/docs/ReleaseNotes.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 869d62aebfb1..a6cbf25fd48a 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -76,6 +76,9 @@ Non-comprehensive list of changes in this release - Configuration file syntax extended with ``<CFGDIR>`` token. This expands to the base path of the current config file. See :ref:`configuration-files` for details. +- The ``-E -P`` preprocessor output now always omits blank lines, matching + gcc behaviour. Previously, up to 8 consecutive blank lines could appear + in the output. New Compiler Flags ------------------ @@ -91,6 +94,14 @@ New Compiler Flags outside of such a region. - ``-falign-loops=N`` (N is a power of 2) is now supported for non-LTO cases. (`D106701 <https://reviews.llvm.org/D106701>`_) +- The ``-fminimize-whitespace`` flag allows removing redundant whitespace + from preprocessor output (``-E`` flag). When combined with ``-P``, this + includes newlines. Otherwise, only indention is removed (other horizontal + whitespace is always collapsed). + The motivation is to improve compiler cache hit rate by becoming invariant + to whitespace changes, such as reformatting using clang-format. Patches + for `ccache <https://github.com/ccache/ccache/pull/815>`_ and + `sccache <https://github.com/mozilla/sccache/pull/1055>`_ are under review. Deprecated Compiler Flags ------------------------- |