21 lines
502 B
C
21 lines
502 B
C
#include <stdio.h>
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// #define DEBUG 1
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int main() {
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#ifdef DEBUG
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printf("All good, DEBUG is initialized");
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#else
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#error Debug is not initiated!
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#endif
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return 0;
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}
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// #error identifier blocks code compilation if compiler reached it.
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// For example code above will not compile if DEBUG is not initiated.
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//
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// error.c: In function ‘main’:
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// error.c:8:2: error: #error Debug is not initiated!
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// 8 | #error Debug is not initiated!
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// | ^~~~~
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// make: *** [Makefile:14: main] Error 1
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