Hi Tim,
Thanks for your response.
But still there is some problem.
Just look the below code and its output:
Code:
A=1
B=1
$(warning A=$(A), B=$(B))
res_A := $(subst 2,,$(A))
res_B := $(subst 1,,$(B))
$(warning res_A=$(res_A), res_B=$(res_B))
first := $(and $(res_A), $(res_B))
second := $(and $(subst 2,,$(A)),
$(subst 2,,$(B)))
third := $(or $(subst
1,,$(A)), $(subst 2,,$(B)))
$(warning first=$(first), second=$(second), third= $(third))
Output :
makefile:3: A=1, B=1
makefile:7: res_A=1, res_B=
makefile:15: first=, second=, third=
But, according to gmake manual:
$(or condition1[,condition2[,condition3...]])
The or function provides a
“short-circuiting” OR operation. Each argument is expanded, in order. If an
argument expands to a non-empty string the processing stops and the result
of the expansion is that string.
If, after all arguments are expanded, all of them are false (empty), then the result
of the expansion is the empty string.
$(and condition1[,condition2[,condition3...]])
The and function provides a
“short-circuiting” AND operation. Each argument is expanded, in order. If an
argument expands to an empty string the processing stops and the result
of the expansion is the empty string. If all arguments expand to a
non-empty string then the result of the expansion is the expansion of the
last argument.
I am not getting why it is returning empty string for all conditions.
As far as my knowledge it should return
first=
second = 1
third=1
am I correct ???????
I am not able to find out the reason for this response.
Can you help me in this problem ?
Thanks and Regards
Rakesh
--- On Fri, 6/6/08, Tim Murphy <address@hidden> wrote:
From: Tim Murphy <address@hidden>
Subject: Re: Help : how to use $(or condition ) & $(and condition ) in makefile
To: address@hidden
Date: Friday, June 6, 2008, 3:40 PM
Hi, # do "equal" by seeing if a subst returns the empty string: A_is_2:=$(if $(subst 2,,$(A)),,T) B_is_4:=$(if $(subst 4,,$(B)),,T) AandB:=$(and $(A_is_2),$(B_is_4)) # then you could do something based on this:
ifneq ($(AandB),) # do something . . . . endif One could make it look nicer by making an equals macro: define eq $(if $(1:$(2)=),,$(if $(2:$(1)=),,T)) endef which you could use as follows:
ifneq ($(and $(call eq,$(A),2),$(call eq,$(B),4)),) # do what you want to do when A=2 and B=4 # . . . .. . . endif Cheers, Tim 2008/6/6 rakesh aggarwal < address@hidden>:
Hi sam,
Very very thanks for your valuable suggestion.
I have one debut that I am explaining through this example.
I have 2 variable (let assume A and B) which contain some value.
I want to test A==2 and B==4 using $(and condition) function.
How can I put this condition in function??
I want only different output for the situation when any of the condition is
wrong (either A != 2 or B != 4) and both are right (A ==2 and B==4 ).
result := $(and condition )
$(warning result=$(result))
Regards
Rakesh
--- On Thu, 6/5/08, Sam Ravnborg <address@hidden> wrote:
From: Sam Ravnborg <address@hidden>
Subject: Re: Help : how to use $(or condition ) & $(and condition ) in makefiles
To: "rakesh aggarwal" <address@hidden>
Cc: address@hidden
Date: Thursday, June 5, 2008, 11:28 PM
Notice that this is condition and not
expressions.
Sample:
havefile := $(if $(wildcard myfile.c), YES, NO)
$(warning HAVEFILE=$(HAVEFILE))
This will print
HAVEFILE=NO
if no myfile.c exist (because the $(wildcard myfile.c) expands to an
empty
string
Sam |
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