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   victor yodaiken (vyodaiken@discuss.systems)'s status on Tuesday, 17-Dec-2024 08:25:51 JST victor yodaiken

   It turns out that sometime ago #gcc has added the #clang attribute #may_alias to C (and C++). After breaking C semantics, despite clear objections from Dennis Ritchie, to enable unquantified and feeble "optimizations" based on aliasing, the compiler bosses have had to smuggle back a version. Looks like these changes went into some of libc about a year ago.
   #wg14 #Cstandard

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     Martin Uecker (uecker@mastodon.social)'s status on Tuesday, 17-Dec-2024 08:25:50 JST Martin Uecker

     in reply to

     @vyodaiken You are about two decades late:
     https://github.com/gcc-mirror/gcc/commit/d18b1ed89ece9698c8e3d0a90534bbf9fe103951
     (clang did not exist then)

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     victor yodaiken (vyodaiken@discuss.systems)'s status on Tuesday, 17-Dec-2024 08:32:17 JST victor yodaiken

     in reply to

     • Martin Uecker

     @uecker My bad. looks like libc qsort added may_alias attributes about a year ago. I know musl was using it a long time ago, but my memory was that it required clang.