#
# All Makefiles must follow the following conventions:
#
# - Compilation and linking steps must be done via the 'cmd' function:
#   e.g., use '$(call cmd,ld_so_o)' to create a shared library using LD
#
# - File-specific build flags must be specified via variables of the format 'FLAG-filename':
#   e.g., use 'LDFLAGS-libsysdb.so=...' to specify libsysdb.so-specific linker flags
#

ifeq ("$(origin V)", "command line")
  BUILD_VERBOSE = $(V)
endif
ifndef BUILD_VERBOSE
  BUILD_VERBOSE = 0
endif

ifeq ($(BUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet = quiet_
  Q = @
endif

export Q quiet BUILD_VERBOSE

squote  := '
escsq = $(subst $(squote),'\$(squote)',$1)

echo-cmd = $(if $($(quiet)cmd_$(1)), echo '  $(call escsq,$($(quiet)cmd_$(1)))';)
cmd = @$(echo-cmd) $(cmd_$(1))


quiet_cmd_generated_offsets_s = [ $@ ]
      cmd_generated_offsets_s = $(CC) $(CFLAGS) $(defs) -S $< -o $@

generated-offsets.s: generated-offsets.c $(filter-out asm-offsets.h,$(headers))
	$(call cmd,generated_offsets_s)
CLEAN_FILES += generated-offsets.s


quiet_cmd_asm_offsets_h = [ $@ ]
      cmd_asm_offsets_h = \
	(set -e; \
	 echo "/* DO NOT MODIFY. THIS FILE WAS AUTO-GENERATED. */"; \
	 echo "\#ifndef _ASM_OFFSETS_H_"; \
	 echo "\#define _ASM_OFFSETS_H_"; \
	 echo ""; \
	 awk '/\.ascii "GENERATED_INTEGER/{print "\#ifndef " $$3 "\n\#define " $$3 " " $$4 "\n\#endif"}' $^; \
	 echo ""; \
	 echo "\#endif") > $@

asm-offsets.h: generated-offsets.s
	$(call cmd,asm_offsets_h)
CLEAN_FILES += asm-offsets.h

quiet_cmd_generated_offsets_py = [ $@ ]
      cmd_generated_offsets_py = \
	(set -e; \
	 echo "\# DO NOT MODIFY. THIS FILE WAS AUTO-GENERATED."; \
	 echo ""; \
	 awk '/\.ascii "GENERATED_INTEGER/{print $$3 " = " $$4}' $^) > $@

generated_offsets.py: generated-offsets.s
	$(call cmd,generated_offsets_py)
CLEAN_FILES += generated_offsets.py generated_offsets.pyc

quiet_cmd_ln_sf = [ $@ ]
      cmd_ln_sf = ln -sf $(abspath $<) $@

cc-option = $(shell set -e; \
	if ($(CC) -Werror $(1) -c -x c /dev/null -o /dev/null) >/dev/null 2>&1; \
	then echo "$(1)"; \
	fi)

# .c
quiet_cmd_cc_o_c = [ $@ ]
      cmd_cc_o_c = $(CC) -MD -MP $(CFLAGS) $(CFLAGS-$@) -c -o $@ $<

quiet_cmd_cpp_i_c = [ $@ ]
      cmd_cpp_i_c = $(CC) -MD -MP -MF $@.d $(CFLAGS) $(CFLAGS-$@) -E -o $@ $<

quiet_cmd_cc_s_c = [ $@ ]
      cmd_cc_s_c = $(CC) -MD -MP -MF $@.d $(CFLAGS) $(CFLAGS-$@) -S -o $@ $<

# .S
quiet_cmd_as_o_S = [ $@ ]
      cmd_as_o_S = $(CC) -MD -MP $(ASFLAGS) $(ASFLAGS-$@) -c -o $@ $<

quiet_cmd_cpp_s_S = [ $@ ]
      cmd_cpp_s_S = $(CC) -MD -MP -MF $@.d $(ASFLAGS) $(ASFLAGS-$@) -E -o $@ $<

# LD
quiet_cmd_ld_so_o = [ $@ ]
      cmd_ld_so_o = $(LD) $(LDFLAGS) $(LDFLAGS-$@) -o $@ $(filter-out %.map %.lds,$^) -soname $(notdir $@)

# AR
quiet_cmd_ar_so_o = [ $@ ]
      cmd_ar_so_o = $(AR) $(ARFLAGS) $(ARFLAGS-$@) $@ $^

quiet_cmd_ar_a_o = [ $@ ]
      cmd_ar_a_o = $(AR) $(ARFLAGS) $(ARFLAGS-$@) $@ $^

# LD only
quiet_cmd_ld = [ $@ ]
      cmd_ld = $(LD) $(LDFLAGS) $(LDFLAGS-$@) -o $@ $(filter-out %.map %.lds,$^)

# OBJCOPY
quiet_cmd_objcopy = [ $@ ]
      cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS-$@) $< $@

# check_no_reloc
# This depends on the output of readelf command.
quiet_cmd_check_no_reloc = [ check_no_reloc $^ ]
      cmd_check_no_reloc = LC_ALL=C readelf -r $^ | grep -q 'There are no relocations in this file.'

# single .c => executable
quiet_cmd_csingle  = [ $@ ]
      cmd_csingle  = $(CC) -MD -MP $(CFLAGS) $(CFLAGS-$@) -o $@ $< $(LDLIBS) $(LDLIBS-$@)

# single .cpp => executable
quiet_cmd_cxxsingle  = [ $@ ]
      cmd_cxxsingle  = $(CXX) -MD -MP $(CXXFLAGS) $(CXXFLAGS-$@) -o $@ $< $(LDLIBS) $(LDLIBS-$@)

# sgx sign
quiet_cmd_sgx_sign_manifest = [ $*.{sig, manifest.sgx} ]
      cmd_sgx_sign_manifest = $(SGX_SIGN) -output $*.manifest.sgx -exec $* -manifest $<

quiet_cmd_sgx_sign = [ $*.{sig, manifest.sgx} ]
      cmd_sgx_sign = $(SGX_SIGN) -output $*.manifest.sgx -manifest $<

# sgx token
quiet_cmd_sgx_get_token = [ Token: $(basename $*) ]
      cmd_sgx_get_token = $(SGX_GET_TOKEN) -output $@ -sig $^

# sgx manifest dependency
quiet_cmd_sgx_manifest_dependency = [ $@ ]
      cmd_sgx_manifest_dependency = \
	(set -e; \
	 echo -n "$(patsubst %.d,%,$@) $(patsubst %.manifest.sgx.d,%.sig,$@) :"; \
	 awk -F= '/^\s*sgx.trusted_files./{file=$$2; gsub("file:", "", file); printf(" \\\n\t%s", file)}' $<; \
	 awk -F= '/^\s*sgx.trusted_children./{file=$$2; gsub("file:", "", file); printf(" \\\n\t%s", file); gsub(".sig", "", file); printf(" \\\n\t%s.manifest.sgx", file)}' $<; \
	 echo "") > $@