Initial snapshot of the new BPF-enabled seccomp sandbox. This code is

sandbox/linux/seccomp_bpf/Makefile

+CFLAGS = -g -O3 -Wall -Werror -Wextra -Wno-missing-field-initializers         \
+         -Wno-unused-parameter -Wno-unused-value -Wno-array-bounds -fPIC -I.
+CPPFLAGS = -D_GNU_SOURCE
+LDFLAGS = -g -lpthread
+DEPFLAGS = -MMD -MF .$@.d
+MODS := demo sandbox_bpf util
+OBJS64 := $(shell echo ${MODS} | xargs -n 1 | sed -e 's/$$/.o64/')
+OBJS32 := $(shell echo ${MODS} | xargs -n 1 | sed -e 's/$$/.o32/')
+ALL_OBJS = $(OBJS32) $(OBJS64)
+DEP_FILES = $(wildcard $(foreach f,$(ALL_OBJS),.$(f).d))
+
+.SUFFIXES: .o64 .o32
+
+all: demo32 demo64
+
+clean:
+        $(RM) demo32 demo64
+        $(RM) *.o *.o32 *.o64 .*.d
+        $(RM) core core.* vgcore vgcore.* strace.log*
+
+-include $(DEP_FILES)
+
+demo32: ${OBJS32}
+        ${CXX} -m32 -o $@ $+ ${LDFLAGS}
+demo64: ${OBJS64}
+        ${CXX} -m64 -o $@ $+ ${LDFLAGS}
+
+.cc.o32:
+        ${CXX} -m32 ${CFLAGS} ${CPPFLAGS} ${DEPFLAGS} -c -o $@ $<
+.cc.o64:
+        ${CXX} -m64 ${CFLAGS} ${CPPFLAGS} ${DEPFLAGS} -c -o $@ $<