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Bug 1324093 - Part 3.5: Add MOZ_MAYBE_UNUSED to mfbt/Attributes.h. r=froydnj

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MozReview-Commit-ID: Ef1nkRipaDg

--HG--
extra : rebase_source : ea298dc948a027e5a686c2f022cce5d8cb170f27
This commit is contained in:
David Major 2017-01-18 09:37:54 +13:00
parent 2166409a1d
commit 0cf4adb5f3
1 changed files with 21 additions and 0 deletions
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21
mfbt/Attributes.h
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@ -274,6 +274,27 @@
# define MOZ_MUST_USE
#endif
/**
* MOZ_MAYBE_UNUSED suppresses compiler warnings about functions that are
* never called (in this build configuration, at least).
*
* Place this attribute at the very beginning of a function declaration. For
* example, write
*
* MOZ_MAYBE_UNUSED int foo();
*
* or
*
* MOZ_MAYBE_UNUSED int foo() { return 42; }
*/
#if defined(__GNUC__) || defined(__clang__)
# define MOZ_MAYBE_UNUSED __attribute__ ((__unused__))
#elif defined(_MSC_VER)
# define MOZ_MAYBE_UNUSED __pragma(warning(suppress:4505))
#else
# define MOZ_MAYBE_UNUSED
#endif
/**
* MOZ_FALLTHROUGH is an annotation to suppress compiler warnings about switch
* cases that fall through without a break or return statement. MOZ_FALLTHROUGH