Leonardo Taccari iamleot

## xopen-stdc-extensions.md

      
        
          
            
              
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                jperkin
                / xopen-stdc-extensions.md
            
            
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              July 19, 2021 10:41
            
              
                SunOS, _XOPEN_SOURCE, _POSIX_C_SOURCE, C99, etc...
              
          
        
      
        
  
      
    How To Correctly Set _XOPEN_SOURCE and __EXTENSIONS__

This is a work-in-progress, but aims to help navigate the murky waters
of setting _XOPEN_SOURCE in such a way that it is compatible across C
standards on SunOS systems.
Introduction

A table is worth a thousand words.  Defines used in a default compilation
environment (i.e. no -std=.. specified):