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Diffstat (limited to 'Doc/using/configure.rst')
| -rw-r--r-- | Doc/using/configure.rst | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/using/configure.rst b/Doc/using/configure.rst index ce858ab..fbe280d 100644 --- a/Doc/using/configure.rst +++ b/Doc/using/configure.rst @@ -314,6 +314,13 @@ also be used to improve performance. is dependent on a combination of the build environment + the other optimization configure args + the CPU architecture, and not all combinations are supported. + BOLT versions before LLVM 16 are known to crash BOLT under some scenarios. + Use of LLVM 16 or newer for BOLT optimization is strongly encouraged. + + The :envvar:`!BOLT_INSTRUMENT_FLAGS` and :envvar:`!BOLT_APPLY_FLAGS` + :program:`configure` variables can be defined to override the default set of + arguments for :program:`llvm-bolt` to instrument and apply BOLT data to + binaries, respectively. .. versionadded:: 3.12 |