Re: AND, OR and NOT Operations

[Oleksandr Gavenko]

On 11.05.2011 9:39, Ajay Jain wrote:
> HI,
>
> I am finding it difficult to comprehend and, or and not operations in
> Make. What I would like to achieve is as follows:
>
> ifeq ("X","A)&&  ifeq("X","B) ..&&  ifeq ("X","Z")
> ...
> endif
>
> I need some permutations of&&, ||&  ! operations.
>
> Though I do see the following in Manuals - $(or
> condition1[,condition2[,condition3...]]), $(and
> condition1[,condition2[,condition3...]]) but using them is a
> challenge.
There are many solutions. But they look not so clear as in C-lang notations.

This for logical AND:

ifeq 'yes' '$(DEBUG)'
  ifeq 'no' '$(OPTIM)'
    ...
  endif
else
   ...
endif

For logical OR operation you can use variable with 2 values - one empty 
(for false),
another anything (for true).
After evaluating COND == 1 if COND1 or COND2 == 1:

COND =
ifeq '' '$(COND1)'
  COND = 1
endif
ifeq '' '$(COND2)'
  COND = 1
endif

Or shortly:

ifneq '' '$(COND1)$(COND2)'
  # here if COND1 or COND2 are true
endif

So tips you can found in http://gmsl.sourceforge.net/

--
С уважением, Александр Гавенко.