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authorkennytm <kennytm@gmail.com>2018-03-14 16:29:42 +0800
committerkennytm <kennytm@gmail.com>2018-03-15 00:15:44 +0800
commit4ea78d4c844bfff0efbc5043efd04f40e44c9b01 (patch)
tree9f91c28c792977f97cb136370e64f9b6ad64e876 /src/rustllvm/PassWrapper.cpp
parentd089fe974edc53fa34384e8e76eeb1eca0d89042 (diff)
parentc1337cda4ccf349b8a5a80156e32c2499520b621 (diff)
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Rollup merge of #48765 - Phlosioneer:10234-wall-help-message, r=estebank
Add info message for -Wall command

Users coming from other languages (namely C and C++) often expect
to use a -Wall flag. Rustc doesn't support that, and previously it
simply printed that it didn't recognize the "all" lint.

This change makes rustc print out a help message, explaining:
- Why there is no -Wall flag
- How to view all the available warnings
- Point out that the most commonly used warning is -Wunused
- Instead of using a command-line flag, the user should consider
  a !#[warn(unused)] directive in the root of their crate.

I tried to keep the language consistent with the other usage help. Comment if I should change anything.

closes #10234, if accepted.
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