6.60.1 ARM Pragmas

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_calls
Set all subsequent functions to have the long_call attribute.
no_long_calls
Set all subsequent functions to have the short_call attribute.
long_calls_off
Do not affect the long_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