gcc/libgcc/config/t-dfprules

# Use DFP_ENABLE to build decimal floating point support routines for
# all decimal floating point types (32-bit, 64-bit and 128-bit). We
# use `true' for clarity, but any value will do.
#
DFP_ENABLE = true

# DFP_CFLAGS can be used to pass target-specific CFLAGS when compiling
# dfp-bit.c.  This is useful for overriding the definition of macros.
#
# DFP_CFLAGS = -DFOO=bar