Fwd: Help : how to use $(or condition ) & $(and condition ) in makefile

[Tim Murphy]

Sorry, forgot to send this to bug-make as well.

---------- Forwarded message ----------
From: Tim Murphy <address@hidden>
Date: 2008/6/6
Subject: Re: Help : how to use $(or condition ) & $(and condition ) in makefile
To: address@hidden


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

On Thu, Jun 05, 2008 at 05:36:56AM -0700, rakesh aggarwal wrote:
> Hi,

> 
> I read the GNU make manual and found there are $(or condition ) and $(and
condition ) functions. ( at
http://www.gnu.org/software/make/manual/make.html#Conditional-Functions )


> But i didnt get in which format i have to put conditions in these
functions.

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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