t-m32r

gcc-you can use this code to learn something about gcc, and inquire further into linux,

# We want fine grained libraries, so use the new code to build the
# floating point emulation libraries.
FPBIT = fp-bit.c
DPBIT = dp-bit.c

# Turn off the SDA while compiling libgcc2.  There are no headers for it
# and we want maximal upward compatibility here.

TARGET_LIBGCC2_CFLAGS = -G 0

fp-bit.c: $(srcdir)/config/fp-bit.c
	echo '#define FLOAT' > fp-bit.c
	cat $(srcdir)/config/fp-bit.c >> fp-bit.c

dp-bit.c: $(srcdir)/config/fp-bit.c
	cat $(srcdir)/config/fp-bit.c > dp-bit.c

# We need to use -fpic when we are using gcc to compile the routines in
# initfini.c.  This is only really needed when we are going to use gcc/g++
# to produce a shared library, but since we don't know ahead of time when
# we will be doing that, we just always use -fpic when compiling the
# routines in initfini.c.
# -fpic currently isn't supported for the m32r.

CRTSTUFF_T_CFLAGS =

# .init/.fini section routines

crtinit.o: $(srcdir)/config/m32r/initfini.c $(GCC_PASSES) $(CONFIG_H)
	$(GCC_FOR_TARGET) $(GCC_CFLAGS) $(INCLUDES) $(CRTSTUFF_T_CFLAGS) \
	  -DCRT_INIT -finhibit-size-directive -fno-inline-functions \
	  -g0 -mmodel=medium -c $(srcdir)/config/m32r/initfini.c -o crtinit.o

crtfini.o: $(srcdir)/config/m32r/initfini.c $(GCC_PASSES) $(CONFIG_H)
	$(GCC_FOR_TARGET) $(GCC_CFLAGS) $(INCLUDES) $(CRTSTUFF_T_CFLAGS) \
	  -DCRT_FINI -finhibit-size-directive -fno-inline-functions \
	  -g0 -mmodel=medium -c $(srcdir)/config/m32r/initfini.c -o crtfini.o

m32rx:
	mkdir $@

m32rx/crtinit.o: m32rx $(srcdir)/config/m32r/initfini.c $(GCC_PASSES) $(CONFIG_H)
	$(GCC_FOR_TARGET) $(GCC_CFLAGS) $(INCLUDES) $(CRTSTUFF_T_CFLAGS) \
	-DCRT_INIT -finhibit-size-directive -fno-inline-functions \
	-g0 -mmodel=medium -c $(srcdir)/config/m32r/initfini.c -m32rx \
	-o m32rx/crtinit.o

m32rx/crtfini.o: m32rx $(srcdir)/config/m32r/initfini.c $(GCC_PASSES) $(CONFIG_H)
	$(GCC_FOR_TARGET) $(GCC_CFLAGS) $(INCLUDES) $(CRTSTUFF_T_CFLAGS) \
	-DCRT_FINI -finhibit-size-directive -fno-inline-functions \
	-g0 -mmodel=medium -c $(srcdir)/config/m32r/initfini.c -m32rx \
	-o m32rx/crtfini.o

# -mmodel={small,medium} requires separate libraries.
# We don't build libraries for the large model, instead we use the medium
# libraries.  The only difference is that the large model can handle jumps
# more than 26 signed bits away.

MULTILIB_OPTIONS = mmodel=small/mmodel=medium m32r/m32rx
MULTILIB_DIRNAMES = small medium m32r m32rx
MULTILIB_MATCHES = mmodel?medium=mmodel?large

# Set MULTILIB_EXTRA_OPTS so shipped libraries have small data in .sdata and
# SHN_M32R_SCOMMON.
# This is important for objects referenced in system header files.
MULTILIB_EXTRA_OPTS = msdata=sdata

LIBGCC = stmp-multilib
INSTALL_LIBGCC = install-multilib