[llvm-branch-commits] [clang] 6ff25fb - [ReleaseNotes] Mention -fmacro-prefix-map and -ffile-prefix-map.

[Peter Wu via llvm-branch-commits]

Author: Peter Wu
Date: 2020-02-27T15:11:47+01:00
New Revision: 6ff25fbe749efca9faf1fc0a9d30e51272ce0653

URL: https://github.com/llvm/llvm-project/commit/6ff25fbe749efca9faf1fc0a9d30e51272ce0653
DIFF: https://github.com/llvm/llvm-project/commit/6ff25fbe749efca9faf1fc0a9d30e51272ce0653.diff

LOG: [ReleaseNotes] Mention -fmacro-prefix-map and -ffile-prefix-map.

Differential revision: https://reviews.llvm.org/D75012

Added: 
    

Modified: 
    clang/docs/ReleaseNotes.rst

Removed: 
    


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diff  --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index c9d0461b65aa..d959791d75b6 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -151,6 +151,12 @@ New Compiler Flags
   `-mcmodel=small` and `-mcmodel=medium` respectively. Preprocessor definitions
   for `__riscv_cmodel_medlow` and `__riscv_cmodel_medany` have been corrected.
 
+- ``-fmacro-prefix-map=OLD=NEW`` substitutes directory prefix ``OLD`` for
+  ``NEW`` in predefined preprocessor macros such as ``__FILE__``. This helps
+  with reproducible builds that are location independent. The new
+  ``-ffile-prefix-map`` option is equivalent to specifying both
+  ``-fdebug-prefix-map`` and ``-fmacro-prefix-map``.
+
 Deprecated Compiler Flags
 -------------------------