What is MSVC /Zp alternative on GCC and clang?

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In case, i want to define the structure alignment at a module level using the compiler flags such as /Zp for cl on windows. What are the alternatives on GCC and clang?

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gcc -v --help gives:

-fpack-struct               Pack structure members together without holes
-fpack-struct=<number>      Set initial maximum structure member alignment

clang has the same switch (at least clang 3.x).