# New Ticket Created by Sylvain Colinet # Please include the string: [perl #126675] # in the subject line of all future correspondence about this issue. # <URL: https://rt.perl.org/Ticket/Display.html?id=126675 >
While writing a binding for Gumbo (A c99 lib to parse html) I came across an error on amd64 bits. One of the mapped struct has his size evaluated wrongly by nativesizeof (different than a call from sizeof see: http://pastebin.com/FVagmG6T). It provokes random segfault because of that. It seem NC try to align the struct and fail. (8 bytes are added) After isolating on a test file the struct (see attached file) and tracking some value on https://github.com/MoarVM/MoarVM/blob/master/src/6model/reprs/CStruct.c#L110 I appear that after evaluating the size of the 2 last attributes (12 bytes each one) https://github.com/MoarVM/MoarVM/blob/master/src/6model/reprs/CStruct.c#L256 realign the size and adding 2 time 4 bytes, ending with the wrong size of 104 bytes instead of 96. I don't know if the align for the struct that is 12 bytes sized should be 4 bytes (and not ALIGNOF(void*) that is 8 for 64bits) or just the pointed (L256) adjustment is wrong
testwrongsize.p6
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