From: Manish Goregaokar <manishsmail@gmail.com>
Date: Fri, 6 Mar 2015 03:28:30 +0000 (+0530)
Subject: Rollup merge of #22980 - alexcrichton:debug-assertions, r=pnkfelix
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=efb487b503d87f04448fc5e6f75038ca98b8670e;p=rust.git

Rollup merge of #22980 - alexcrichton:debug-assertions, r=pnkfelix

 This commit is an implementation of [RFC 563][rfc] which adds a new
`cfg(debug_assertions)` directive which is specially recognized and calculated
by the compiler. The flag is turned off at any optimization level greater than 1
and may also be explicitly controlled through the `-C debug-assertions`
flag.

[rfc]: https://github.com/rust-lang/rfcs/pull/563

The `debug_assert!` and `debug_assert_eq!` macros now respect this instead of
the `ndebug` variable and `ndebug` no longer holds any meaning to the standard
library.

Code which was previously relying on `not(ndebug)` to gate expensive code should
be updated to rely on `debug_assertions` instead.

Closes #22492
[breaking-change]
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efb487b503d87f04448fc5e6f75038ca98b8670e