tools/build/feature/test-reallocarray.c - linux/kernel/git/bpf/bpf - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 #define _GNU_SOURCE
 #include <stdlib.h>

 int main(void)
 {
 	return !!reallocarray(NULL, 1, 1);
 }

 #undef _GNU_SOURCE
	// SPDX-License-Identifier: GPL-2.0
	#define _GNU_SOURCE
	#include <stdlib.h>

	int main(void)
	{
	return !!reallocarray(NULL, 1, 1);
	}

	#undef _GNU_SOURCE