Disable variable-length automatic arrays in gcc

Question

I couldn't disable it even though by using -std=c89 flag. How can I disable it?

Keith Thompson · Accepted Answer · 2017-04-01 19:44:30Z

33

You can generate an error for variable length arrays using a compiler flag:

-Werror=vla

edited Apr 1, 2017 at 19:44

Keith Thompson

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answered Jul 13, 2016 at 11:53

cauon

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Community · Accepted Answer · 2017-05-23 12:34:11Z

2

Variable-length arrays in C89?

GCC always supported variable length arrays AFAIK. Setting -std to C89 doesn't turn off GCC extensions ...

See also:

https://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html

http://tigcc.ticalc.org/doc/gnuexts.html#SEC76

Finally,

http://tigcc.ticalc.org/doc/gnuexts.html

'-pedantic' and other options cause warnings for many GNU C extensions. You can prevent such warnings within one expression by writing __extension__ before the expression. __extension__ has no effect aside from this.

edited May 23, 2017 at 12:34

CommunityBot

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answered Jul 29, 2015 at 20:42

paulsm4

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2 Comments

Keith Thompson Over a year ago

I'm not sure why this answer was accepted. The question was how to disable VLAs. @cauon's answer is the correct one.

KANJICODER Over a year ago

It almost looks like the answer was written by some type of automated bot that just looks up random links and quotes related to the search term.

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