Michi Michi - 3 months ago 54
C Question

How to use C11 standard in Code::Blocks

Like the Title says I need to make

code::blocks
to work with
C11
and I can't figure out how to do it.

I went to
settings
=>
compiler settings
=>
Other options
and I added
-std=c11
and tried also with
-std=gnu11
, both doesn't seems to work.

I compiled
gcc-5.2
and then I changed the default compiler (gcc-4.9) and still no result.




When I try to compile the following program:

#include<stdio.h>

int main(void){
int arr[] = {0,1,2,3,4};

for(int i=0;i<5;i++){
printf("%d ",arr[i]);
}

return 0;
}


I get the following:

|6|error: ‘for’ loop initial declarations are only allowed in C99 or C11 mode|





But if I do it in terminal (ubuntu 15.04, 64BIT, gcc-5.2):

./install/gcc-5.2.0/bin/gcc5.2 program.c -o program


Seems to work fine.

My question is, how to make
code::blocks
to work with
c11
?

Answer

Since the GCC 5.x versions run with -std=gnu11 by default, Code::Blocks must be doing something (such as passing -ansi or -std=gnu90) to the compiler to make it work differently.

Investigate all the options that are sent to the compiler. Find a way to have Code::Blocks show you the exact incantation it uses when compiling. Then work out how to fix it.

Options that are used are:

-Wall -Wextra -Werror -Wstrict-prototypes -Wconversion -std=gnu11 \
-O0 -g -ansi `pkg-config --cflags gtk+-3.0`

The -ansi is doing the damage; it is equivalent to -std=c90 or perhaps -std=gnu90 — it explicitly undoes -std=c11 or -std=gnu11.