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#PRAGMA ONCE support ?

 
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AhmetB



Joined: 12 Jun 2007
Posts: 1

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#PRAGMA ONCE support ?
PostPosted: Tue Apr 17, 2012 8:38 am     Reply with quote
Hi,

i have CCS v3.249 and i have tried

#PRAGMA ONCE

but it is not suppoted,
is there any other pre-processor command to easily prevent recursive includes ?
Ttelmah



Joined: 11 Mar 2010
Posts: 19513

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PostPosted: Tue Apr 17, 2012 9:07 am     Reply with quote
#PRAGMA is not supported at all. It really drives me mad to see the number of people using this, without just reading the manual. Remember CCS does not have a pre-compile 'pass' as such... Smile

#PRAGMA ONCE, is not a standard feature of C. It is widely supported, but actually gives different results on some compilers, so should only be used with great caution, even when apparently supported...

The 'historical' way to do this, is to always write your include files to check if they are already loaded. So just have:
Code:

//Include file for LCD
#ifndef MYLCD_INCLUDE
#define MYLCD_INCLUDE

//code

#endif


Three lines in each file - perhaps use the filename as the #define.

Best Wishes
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