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Even though it may seem that #pragma once is supported on z/OS C++, it is not documented on z/OS for the C++ compiler.
Also, if you compile a test case which uses #pragma once with -qinfo=all you will get the following message:
"./foo.h", line 42.13: CCN8735 (I) The use of pragma once is deprecated. It may not be supported in future releases of the compiler or on other platforms.
So this RFE is being rejected.
This RFE is still being investigated.