Commit 837a2e26 authored by Peter Maydell's avatar Peter Maydell Committed by Paolo Bonzini
Browse files

rules.mak: New logical functions for handling y/n values 



Add new logical functions for handling y/n values like those we
use in CONFIG_FOO variables:
 lnot : logical NOT
 land : logical AND
 lor : logical OR
 lxor : logical XOR
 leqv : logical equality, inverse of lxor
 lif : like Make's $(if) but with an eq-like test

Based on an idea by Ákos Kovács <akoskovacs@gmx.com>.

Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 39c153b8

rules.mak

+17 −0
Original line number Diff line number Diff line
@@ -89,6 +89,23 @@ find-in-path = $(if $(find-string /, $1), \ 
        $(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)



# Generate files with tracetool

TRACETOOL=$(PYTHON) $(SRC_PATH)/scripts/tracetool.py