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A comment on “gcc will quietly break nearly half of all the packages that it compiles”. Parent comment

Re:“gcc will quietly break nearly half of all the packages t... by Dylan16807 on Saturday October 24, 2015 @01:47PM (#10444296)
But that's not "undefined behavior" either. The post misleads people.

Certain things are unspecified. It can call in any order for example.

Other things are undefined. If you do them your program is no longer valid at all, and can crash or corrupt.

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Re:“gcc will quietly break nearly half of all the packages t... by nitrogen on Saturday October 24, 2015 @01:57PM (#10444330)
To reiterate/emphasize this point: "undefined", "unspecified", and a few other related terms are Things in C. They have specific, non-interchangeable, well-defined meanings in the C specifications.
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