https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64852
Bug ID: 64852
Summary: C++ accepts invalid(?) constants only at -O0
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
This program should probably be rejected, but actually it compiles correctly
and
without warning, the resulting code "works".
Same behaviour with current trunk and 4.6.2
cat test.C
#include <arpa/inet.h>
#include <stdio.h>
const short test = htons(10);
int
main()
{
printf("%x\n", test);
}
g++ -O0 test.C && ./a.out
a00
g++ -O1 test.C
In file included from /usr/include/x86_64-linux-gnu/bits/byteswap.h:35:0,
from /usr/include/endian.h:60,
from /usr/include/x86_64-linux-gnu/sys/types.h:216,
from /usr/include/x86_64-linux-gnu/sys/uio.h:23,
from /usr/include/x86_64-linux-gnu/sys/socket.h:26,
from /usr/include/netinet/in.h:23,
from /usr/include/arpa/inet.h:22,
from test.C:1:
test.C:4:20: error: statement-expressions are not allowed outside functions nor
in template-argument lists
const short test = htons(10);
the same program is correctly rejected if compiled in C mode,
but interestingly with a completely different message on -O0 and -O1
