From 837a2e267f9c01cd9204d5b701712d6d26a5220e Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Fri, 13 Sep 2013 18:25:51 +0100 Subject: rules.mak: New logical functions for handling y/n values MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 . Signed-off-by: Peter Maydell Signed-off-by: Paolo Bonzini --- rules.mak | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'rules.mak') diff --git a/rules.mak b/rules.mak index abc2e846b3..65a1b9695b 100644 --- a/rules.mak +++ b/rules.mak @@ -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 -- cgit v1.2.1