https://issues.dlang.org/show_bug.cgi?id=22315 --- Comment #2 from Walter Bright <bugzilla at digitalmars.com> --- https://gcc.gnu.org/onlinedocs/gcc-4.4.4/gcc/Structure_002dPacking-Pragmas.html https://docs.microsoft.com/en-us/cpp/preprocessor/pack?view=msvc-160 --