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

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llvm-svn: 294725
This commit is contained in:
Mehdi Amini 2017-02-10 07:21:06 +00:00
parent 8b3f28cdb1
commit b9261c9634
1 changed files with 4 additions and 1 deletions
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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 clang -O2 -mllvm -opt-bisect-limit=256 my_file.c
The -opt-bisect-limit option may also be applied to link-time optimizations by 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: 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 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 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 passes run in the primary driver compilation phase are not affected by options