Forums - how to optmize for unused function

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how to optmize for unused function
zhengfang.liu
Join Date: 16 Dec 21
Posts: 1
Posted: Thu, 2021-12-16 01:34
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Dear,

we use the verison of 4.0 clang &llvm which is provided by Qualcomm,

but i found it not optimized the unused funtion.

I have try many methon, but it still can not work.

such as :

-Xlinker -dead_strip, it report error message

clang-4.0: warning: argument unused during compilation: '-Xliner' [-Wunused-command-line-argument]
clang-4.0: warning: argument unused during compilation: '-dead_strip' [-Wunused-command-line-argument]
 

I use -flto, as below

/tools/linux/llvm/bin/clang  -flto  optimized.bc
 
Fatal: cannot read file crt1.o
 
so how can i optimize for unused fucntion?
thank you very much.
Liu Zhengfang
 
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Re: how to optmize for unused function
mengdiz
Join Date: 6 Dec 21
Posts: 27
Posted: Sun, 2021-12-19 18:11
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Hi,

Could you refer to below links?

https://lists.llvm.org/pipermail/llvm-dev/2018-January/120233.html

https://www.incredibuild.com/blog/compiling-with-clang-optimization-flags

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