https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50909
--- Comment #14 from Rudolf <rudolf.chrispens at web dot de> --- Even if the compiler would just use the workaround with pragma-pack() when he encounters this specific pragma would be fine. (If there is a warning for that!) Some Infomrations: http://www.msg.ucsf.edu/local/programs/IBM_Compilers/C:C++/html/compiler/ref/rnpgalin.htm Seems like I will have to use the MAC OS Clang compiler for now...