Variable name 'xor' results in internal compiler error 'segmentation fault'!

Question

Compiling this code

int main(int argc, char **argv)
{
    int xor = 0;
}

via

g++ main.cpp

results in:

internal compiler error: Segmentation fault

with

i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5659).

Renaming the variable removes the error.

Question: Is gcc from Apple crap?

For me on 4.4.1-4ubuntu9, it just gives a normal error, "expected unqualified-id before ‘^’ token." (xor is an alias for ^). No segmentation fault. — Matthew Flaschen, Jul 03 '10 at 00:13
Note that unless you installed gcc independently, it's a symlink to clang since OSX 10.9 (Mavericks). — Mr_Pouet, Jan 21 '14 at 19:30

score 3 · Answer 1 · edited May 23 '17 at 12:03

3

and_eq, bitand, bitor, compl, not, not_eq, or, or_eq, xor and xor_eq are keywords which are enabled with -ansi or -foperator-names

you have one of those switches enabled?

check also out: this

edited May 23 '17 at 12:03

Community

answered Jul 03 '10 at 00:09

AndersK

1

@Wolfgang, it's not really g++-specific, or hidden. The C++ standard says `xor` is reserved, and using a reserved word in another context is undefined behavior. That means anything can happen. Of course, it's preferable for the compiler to print a clear error message. – Matthew Flaschen Jul 03 '10 at 00:37
@Matthew I meant it as a joke. To use logical operators spelled out in conditions is quite a nice feature which makes code more readable (esp. to collegues who are used to scripting languages), but i doubt that many C++ programmers know about or use this. – WolfgangP Jul 03 '10 at 15:54

score 3 · Accepted Answer · answered Jul 03 '10 at 00:12

3

Any time your compiler segfaults, it's a bug. Your already reduced test case is a perfect candidate to be reported to GCC.

answered Jul 03 '10 at 00:12

Clark Gaebel

1

It should be reported to Apple (http://developer.apple.com/bugreporter/). They can best determine if it's a bug they introduced, or present in upstream. If it is in upstream, they will typically file a bug there. – Matthew Flaschen Jul 03 '10 at 00:14
Thanks for your hint. I reported it to Apple as well as to the gcc team. – WolfgangP Jul 03 '10 at 00:20

2 Answers2