6.61.2 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_callattribute. no_long_calls-
Set all subsequent functions to have the
short_callattribute. long_calls_off-
Do not affect the
long_callorshort_callattributes of subsequent functions.
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https://gcc.gnu.org/onlinedocs/gcc-8.3.0/gcc/ARM-Pragmas.html