clang++ warning: "warning: unknown warning option '-Wno-maybe-uninitialized'"

Question

Having installed LLVM on Ubuntu 16.04 using the command:

sudo apt-get install clang llvm

I get the following error when compiling:

nlykkei@nlykkei-VirtualBox:~$ clang++ -g toy.cpp `llvm-config --cxxflags --ldflags --system-libs --libs` -o toy
warning: unknown warning option '-Wno-maybe-uninitialized'; did you mean
      '-Wno-uninitialized'? [-Wunknown-warning-option]
1 warning generated.

To be specific, I follow the tutorial: http://llvm.org/docs/tutorial/LangImpl03.html on the LLVM website.

The version of LLVM is 3.8.

How do I get rid of this warning?

Thanks.

Which version of clang / llvm do you have?

Banex
– Banex

2017-01-16 09:57:21 +00:00
Commented Jan 16, 2017 at 9:57 — Banex
– Banex, Commented Jan 16, 2017 at 9:57
the maybe_uninitialized attribute is c++17 isn't it?

Richard Hodges
– Richard Hodges

2017-01-16 09:58:29 +00:00
Commented Jan 16, 2017 at 9:58 — Richard Hodges
– Richard Hodges, Commented Jan 16, 2017 at 9:58

cnicutar · Accepted Answer · 2017-01-16 09:59:32Z

13

This is a bug in llvm-config. Long story short, llvm-config outputs -Wno-maybe-uninitialized which is not a warning implemented by clang.

One possible workaround is to add an extra flag squelching warnings about unknown warnings.

clang++ <your flags> -Wno-unknown-warning-option `llvm-config ...`

answered Jan 16, 2017 at 9:59

cnicutar

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Comments

Dharman · Accepted Answer · 2020-05-07 17:04:27Z

0

This warning comes when you recently upgraded your sdk-build-tools with 30.x

I resolved the issue by downgrading sdk-build-tools by 29.x.

Delete all the intermediate files , they will be auto generate again.

Clean Project .

Invalidate Cashes and Restart the Project.

Woow, warning has been removed now.

edited May 7, 2020 at 17:04

Dharman♦

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answered May 7, 2020 at 13:39

Shiva Yadav

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Shivendra · Accepted Answer · 2022-06-24 05:27:27Z

0

Answer mentioned here https://github.com/envoyproxy/envoy/issues/18986 might help. Mostly changing Wno-maybe-uninitialized with -Wno-uninitialized in / bazel/envoy_internal.bzl

answered Jun 24, 2022 at 5:27

Shivendra

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