The ARM target defines pragmas for controlling the default addition of long_call and short_call attributes to functions. See Function Attributes, for information about the effects of these attributes.
long_callslong_call attribute. no_long_callsshort_call attribute. long_calls_offlong_call or short_call attributes of subsequent functions.
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https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gcc/ARM-Pragmas.html