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Fix doc for -opt-bisect-limit: the LTO option is linker specific

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294725 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mehdi Amini 2017-02-10 07:21:06 +00:00
parent f4df3d44a5
commit 2fabd44db6
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docs/OptBisect.rst
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@ -60,12 +60,15 @@ like this:
clang -O2 -mllvm -opt-bisect-limit=256 my_file.c
The -opt-bisect-limit option may also be applied to link-time optimizations by
using a prefix to indicate that this is a plug-in option for the linker. The
using a prefix to indicate that this is a plug-in option for the linker. The
following syntax will set a bisect limit for LTO transformations:
::
# When using Gold or lld
clang -flto -Wl,-plugin-opt,-opt-bisect-limit=256 my_file.o my_other_file.o
# When using ld64 (macOS)
clang -flto -Wl,-mllvm,-opt-bisect-limit=256 my_file.o my_other_file.o
LTO passes are run by a library instance invoked by the linker. Therefore any
passes run in the primary driver compilation phase are not affected by options