m4 process hang

[Verma, Nitin \(GE Consumer & Industrial\)]

Hi Team,

 

I am very new to m4 macros, I effort to learn m4 macro writing. I can across this behavior.

I just made a file `try'

 

[neo]$ cat try
define(x, y)
x
define(x, y)
y
[neo]$

 

And fed to m4

 

[neo]$ m4 try

 

y

 

 

(hangs)

 

Now if I write

 

[neo]$ cat try

define(x, y)
x
define(x, y)

[neo]$

 

and the feed to m4

 

[neo]$ m4 try

 

y

 

[neo]$

 

it works as expected.

Am I doing something wrong?

 

[neo]$ m4 --version
GNU m4 1.4.1
[neo]$

 

Regards,

 

Nitin