c_cpp externの配列定义を使ったビルド时の配列サイズチェック方法（MINIX3より）

Posted 2021-05-14

#define RESOURCE_NUM (8)
#define ARRAY_NUM (8)

struct resource {
	int id;
	unsigned int addr;
	int len;
};

struct resource rscs[] = {
	{ 0, 0x10, 4 },
	{ 1, 0x14, 2 },
	{ 2, 0x16, 2 },
	{ 3, 0x18, 4 },
	{ 4, 0x20, 1 },
	{ 5, 0x21, 1 },
	{ 6, 0x22, 2 },
	{ 7, 0x24, 4 },
};

int array[] = { 1, 2, 3, 4, 5, 6, 7, 8 };

extern int dummy[(RESOURCE_NUM == sizeof(rscs)/sizeof(rscs[0])) ? 1 : -1];
extern int dummy[(ARRAY_NUM == sizeof(array)/sizeof(array[0])) ? 1 : -1];