GCC Segmentation fault for this structured binding using Qt

Asked Sep 06 '19 at 12:20

Active Sep 06 '19 at 13:35

Viewed 198 times

I got a segmentation fault for this code in GCC but compiles fine with MSVC

QMap<int, QPair<QString, QString>> someData; 
// inserting some value
for (auto id : someData.keys()) {
   auto [foo, bar] = someData[id];
   //do stuff with foo, bar.
}

And the structured binding emits a segfault.

Log:

internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.

Solution

declare the structured binding as reference.

auto& [foo, bar] = someData[id];

It looks like GCC cannot deduce the qualifiers, since operator[] returns a T&.

edited Sep 06 '19 at 13:35

asked Sep 06 '19 at 12:20

Bako

1

Can you attach a GDB error log + stack trace? Not sure how you expect someone to solve this without at least that information. – Botje Sep 06 '19 at 12:30
@Botje edited. This is the only log I have access to. – Bako Sep 06 '19 at 12:48
1

Oh, you actually crashed the compiler? Well done! What version of GCC is this? – Botje Sep 06 '19 at 12:59
1

@Botje thank you! its gcc-7.3.0. On the other hand... why am I getting downvoted? – Bako Sep 06 '19 at 13:10
Does it happen with a newer GCC, if you can test that? It may have already been solved. – Botje Sep 06 '19 at 13:18
@Botje I will be able to test it later. But for now, i found a solution, edited the question. – Bako Sep 06 '19 at 13:36
I'm voting to close this question as off-topic because it’s a compiler bug report, not a question. – Davis Herring Sep 06 '19 at 19:03

GCC Segmentation fault for this structured binding using Qt

0 Answers0