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/GCC 7

6.62.6 S/390 Pragmas

The pragmas defined by the S/390 target correspond to the S/390 target function attributes and some the additional options:

zvector
no-zvector

Note that options of the pragma, unlike options of the target attribute, do change the value of preprocessor macros like __VEC__. They can be specified as below:

#pragma GCC target("string[,string]...")
#pragma GCC target("string"[,"string"]...)

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https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gcc/S_002f390-Pragmas.html