994282d2de
On both 32 and 64 bits, the result is: enum Enum → 32 bits, unsigned enum BigEnum → 32 bits, unsigned enum BigEnum2 → 64 bits, unsigned big_enum2_pos → 4 big_enum2_neg → 8 The last two lines show that even if the enum is 64 bit, and the field of an enum is defined with UINT64_C(), the field can still be smaller.
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2016 Zbigniew Jędrzejewski-Szmek
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***/
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#include <stdio.h>
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#include <string.h>
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#include "time-util.h"
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/* Print information about various types. Useful when diagnosing
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* gcc diagnostics on an unfamiliar architecture. */
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#pragma GCC diagnostic ignored "-Wtype-limits"
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#define info(t) \
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printf("%s → %zu bits%s\n", STRINGIFY(t), \
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sizeof(t)*CHAR_BIT, \
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strstr(STRINGIFY(t), "signed") ? "" : \
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((t)-1 < (t)0 ? ", signed" : ", unsigned"));
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enum Enum {
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enum_value,
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};
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enum BigEnum {
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big_enum_value = UINT64_C(1),
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};
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enum BigEnum2 {
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big_enum2_pos = UINT64_C(1),
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big_enum2_neg = UINT64_C(-1),
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};
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int main(void) {
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info(char);
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info(signed char);
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info(unsigned char);
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info(short unsigned);
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info(unsigned);
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info(long unsigned);
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info(long long unsigned);
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info(__syscall_ulong_t);
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info(__syscall_slong_t);
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info(float);
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info(double);
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info(long double);
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info(size_t);
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info(ssize_t);
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info(time_t);
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info(usec_t);
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info(__time_t);
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info(pid_t);
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info(uid_t);
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info(gid_t);
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info(enum Enum);
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info(enum BigEnum);
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info(enum BigEnum2);
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assert_cc(sizeof(enum BigEnum2) == 8);
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printf("big_enum2_pos → %zu\n", sizeof(big_enum2_pos));
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printf("big_enum2_neg → %zu\n", sizeof(big_enum2_neg));
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return 0;
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}
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