Date: Thu, 20 Feb 2025 09:40:54 +0000 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: current@freebsd.org Subject: Empty structures have sizeof(1) in C++ now ? Message-ID: <202502200940.51K9eswS003142@critter.freebsd.dk>
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Is this a bug ?
critter phk> cat /tmp/_.c
#include <stdio.h>
struct foo {
};
int
main(int argc, char **argv)
{
struct foo bar;
printf("%jd %jd\n", sizeof(struct foo), sizeof(bar));
return (0);
}
critter phk> cc -o /tmp/a.out /tmp/_.c
critter phk> /tmp/a.out
0 0
critter phk> c++ -o /tmp/a.out /tmp/_.c
c++: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
critter phk> /tmp/a.out
1 1
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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