# Dummy command so that make thinks it has done something
@true
-CONFIG_NO_PCI = $(if $(subst n,,$(CONFIG_PCI)),n,y)
-CONFIG_NO_KVM = $(if $(subst n,,$(CONFIG_KVM)),n,y)
-CONFIG_NO_XEN = $(if $(subst n,,$(CONFIG_XEN)),n,y)
-
#########################################################
# cpu emulator library
obj-y = exec.o translate-all.o cpu-exec.o
obj-y += fpu/softfloat.o
obj-y += target-$(TARGET_BASE_ARCH)/
obj-y += disas.o
-obj-$(CONFIG_GDBSTUB_XML) += gdbstub-xml.o
-obj-$(CONFIG_NO_KVM) += kvm-stub.o
+obj-$(call notempty,$(TARGET_XML_FILES)) += gdbstub-xml.o
+obj-$(call lnot,$(CONFIG_KVM)) += kvm-stub.o
#########################################################
# Linux user emulator target
# xen support
obj-$(CONFIG_XEN) += xen-all.o xen-mapcache.o
-obj-$(CONFIG_NO_XEN) += xen-stub.o
+obj-$(call lnot,$(CONFIG_XEN)) += xen-stub.o
# Hardware support
ifeq ($(TARGET_NAME), sparc64)
$(wildcard $1), \
$(wildcard $(patsubst %, %/$1, $(subst :, ,$(PATH)))))
+# Logical functions (for operating on y/n values like CONFIG_FOO vars)
+# Inputs to these must be either "y" (true) or "n" or "" (both false)
+# Output is always either "y" or "n".
+# Usage: $(call land,$(CONFIG_FOO),$(CONFIG_BAR))
+# Logical NOT
+lnot = $(if $(subst n,,$1),n,y)
+# Logical AND
+land = $(if $(findstring yy,$1$2),y,n)
+# Logical OR
+lor = $(if $(findstring y,$1$2),y,n)
+# Logical XOR (note that this is the inverse of leqv)
+lxor = $(if $(filter $(call lnot,$1),$(call lnot,$2)),n,y)
+# Logical equivalence (note that leqv "","n" is true)
+leqv = $(if $(filter $(call lnot,$1),$(call lnot,$2)),y,n)
+# Logical if: like make's $(if) but with an leqv-like test
+lif = $(if $(subst n,,$1),$2,$3)
+
+# String testing functions: inputs to these can be any string;
+# the output is always either "y" or "n". Leading and trailing whitespace
+# is ignored when comparing strings.
+# String equality
+eq = $(if $(subst $2,,$1)$(subst $1,,$2),n,y)
+# String inequality
+ne = $(if $(subst $2,,$1)$(subst $1,,$2),y,n)
+# Emptiness/non-emptiness tests:
+isempty = $(if $1,n,y)
+notempty = $(if $1,y,n)
+
# Generate files with tracetool
TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py
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