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74d471d4e4
This gives us a slew of -Wextra fixes (not all of them though!) but we're actually doing it for the monotonic version of timers. This breaks some stuff, so we fix that up next. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
#include "config.h"
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#include <stdio.h>
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#include <string.h>
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/**
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* alignof - ALIGNOF() macro to determine alignment of a type.
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*
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* Many platforms have requirements that certain types must be aligned
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* to certain address boundaries, such as ints needing to be on 4-byte
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* boundaries. Attempting to access variables with incorrect
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* alignment may cause performance loss or even program failure (eg. a
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* bus signal).
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*
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* There are times which it's useful to be able to programatically
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* access these requirements, such as for dynamic allocators.
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*
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* Example:
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* #include <stdio.h>
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* #include <stdlib.h>
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* #include <ccan/alignof/alignof.h>
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*
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* // Output contains "ALIGNOF(char) == 1"
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* // Will also print out whether an onstack char array can hold a long.
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* int main(void)
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* {
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* char arr[sizeof(int)];
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*
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* printf("ALIGNOF(char) == %zu\n", ALIGNOF(char));
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* if ((unsigned long)arr % ALIGNOF(int)) {
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* printf("arr %p CANNOT hold an int\n", arr);
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* exit(1);
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* } else {
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* printf("arr %p CAN hold an int\n", arr);
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* exit(0);
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* }
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* }
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*
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* License: CC0 (Public domain)
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* Author: Rusty Russell <rusty@rustcorp.com.au>
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*/
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int main(int argc, char *argv[])
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{
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if (argc != 2)
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return 1;
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if (strcmp(argv[1], "depends") == 0) {
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return 0;
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}
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return 1;
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}
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