Suppress all make output except for errors and warnings

make -s should do what you're after a bit more neatly. I don't know of a way to force it on the makefiles, but the GNU manual might have one.

Failing that you could check the Linux kernel build system, since that seems to automatically hide stdout.

By adding a "@" to the front of a command, the command line string is suppressed e.g. from

$(addprefix $(OUTPUT_PATH)/,$(C_OBJ)): $(OUTPUT_PATH)/%.o: %.c
        $(CC) -c $(CFLAGS) $< -o $@

to

$(addprefix $(OUTPUT_PATH)/,$(C_OBJ)): $(OUTPUT_PATH)/%.o: %.c
        @$(CC) -c $(CFLAGS) $< -o $@

will take

make[1]: Entering directory `.../libraries/libgcdc/build'
/home/crowe/arm-tools/gcc-arm-none-eabi-4_6-2012q2/bin/arm-none-eabi-gcc -c -Wall -Wchar-subscripts -Wcomment -Wformat=2 -Wimplicit-int -Werror-implicit-function-declaration -Wmain -Wparentheses -Wsequence-point -Wreturn-type -Wswitch -Wtrigraphs -Wunused -Wuninitialized -Wunknown-pragmas -Wfloat-equal -Wundef -Wshadow -Wpointer-arith -Wbad-function-cast -Wwrite-strings -Wsign-compare -Waggregate-return -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wformat -Wmissing-format-attribute -Wno-deprecated-declarations -Wpacked -Wredundant-decls -Wnested-externs -Winline -Wlong-long -Wunreachable-code -Wcast-align --param max-inline-insns-single=500 -mcpu=cortex-m3 -mthumb -mlong-calls -ffunction-sections -g -O0 -D DEBUG -I.. -I../include -I../../libchip_sam3s -I../../libboard_arm_demo -I../../libboard_generic -I../../libusb/include -Dsam3s4 -DTRACE_LEVEL=5 -Dprintf=iprintf ../source/hid_callbacks.c -o debug_sam3s_svn2/hid_callbacks.o
make[1]: Leaving directory ` .../libraries/libgcdc/build'

to

make[1]: Entering directory `.../libraries/libgcdc/build'
make[1]: Leaving directory `.../libraries/libgcdc/build'