Why does the C preprocessor interpret the word “linux” as the constant “1”?
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Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#2While I can't imagine much discussion here that couldn't occur on SO, I did want to say thank you for posting this. I found it quite interesting.
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#3While I can't imagine much discussion here that couldn't occur on SO, I did want to say thank you for posting this. I found it quite interesting.
+1, I love those interesting Stack Overflow (and Stack Exchange) posts that started to appear here every other week. I always learn something new/interesting from them. Thank you dcro :).
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#4This is awesome, I am going to divide by linux in my code everywhere in an attempt to obfuscate what I am doing.
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#5If you're in the habit of writing "struct sockaddr_in sin;", you'll probably be tempted to write "struct sockaddr_un sun;". Just don't expect that code to compile on Solaris.
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#6I spent at least an hour a while ago trying to track down a bug that turned out to be caused by exactly this. I couldn't work out what was happening until I looked at the preprocessor output.
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#7While I can't imagine much discussion here that couldn't occur on SO, I did want to say thank you for posting this. I found it quite interesting.
+1, I love those interesting Stack Overflow (and Stack Exchange) posts that started to appear here every other week. I always learn something new/interesting from them. Thank you dcro :).
no doubt the SO question will soon be closed as "not a question" or "too interesting" or some other draconian response :(
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#8Earlier quoted context omitted.
+1, I love those interesting Stack Overflow (and Stack Exchange) posts that started to appear here every other week. I always learn something new/interesting from them. Thank you dcro :).
no doubt the SO question will soon be closed as "not a question" or "too interesting" or some other draconian response :(
They'll lock it to keep newbies away if nothing else, but I doubt it'll get shut down. This is a "good fit" for the Stack sites though - it's a direct question with one single direct answer.
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#9If you're in the habit of writing "struct sockaddr_in sin;", you'll probably be tempted to write "struct sockaddr_un sun;". Just don't expect that code to compile on Solaris.
Is that just hardcoded into the preprocessor itself? Or is part of ANSI C. Wondering if the MS C++ compiler will do this well.
Re: Why does the C preprocessor interpret the word “linux” as the constant “1”?
#10Just a note: This was on the stackoverflow weekly newsletter yesterday. If you're interested in more questions like this it's worth to check it out, I like it a lot.