====== error ======
<code c>
#error your error_message
</code>

==== description of error ====
The #error directive emits a user-specified error message at compile time and then terminates the compilation.
The following code will cause in compilation error:
<code c>
#include<stdio.h>

int main()
{
    printf("code-reference.com/c");

    return 0;
}

#if !defined(PASS_COMPILER)
#error Syntax to Pass this stage is required !
#endif
</code>
The following code will compile:
<code c>
#define PASS_COMPILER      /*You can write this definition here or any*/ 
#include<stdio.h>

int main()
{
    printf("code-reference.com/c");
    
    /*#define PASS_COMPILER*/
    
    return 0;
}

#if !defined(PASS_COMPILER)
#error Syntax to Pass this stage is required !
#endif
</code>

===== output of error c example =====
In first program: 
No output, because __"PASS_COMPILER"__ is __not defined__ in program, so __compilation terminates__ with Error Message as shown:
<fc #FF0000>//"\main.c|4|error: #error Syntax to Pass this stage is required !|"//</fc>

In the Second program:
Output will be:
<code>
code-reference.com/c
</code>