[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555 Bug 70555 depends on bug 90740, which changed state. Bug 90740 Summary: [9/10 Regression] VLA with lamba causes an incorrect unitialized in this function warning https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90740 What|Removed |Added Status|NEW |RESOLVED Resolution|--- |DUPLICATE
[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555 --- Comment #11 from Godmar Back --- I have attached a test case where capture of multidimensional VLA results in internal compiler error: in expand_expr_real_1, at expr.c:9908 I do not know if this is a duplicate of this bug or a separate bug. The program compiles and runs fine with clang 3.6.2, so I believe this should be valid C++. If this is a different bug and you'd like me to file a separate bug report, let me know. The behavior disappeared if the 'CC' array is no longer VLA.
[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555
Godmar Back changed:
What|Removed |Added
CC||godmar at gmail dot com
--- Comment #10 from Godmar Back ---
Created attachment 44730
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44730&action=edit
failing test
$ g++ dungeonpreprocessed.cpp
dungeon.cpp: In lambda function:
dungeon.cpp:40:68: internal compiler error: in expand_expr_real_1, at
expr.c:9908
auto neighbors = [L, R, C, &CC] (Point p) -> vector {
^
Please submit a full bug report,
with preprocessed source if appropriate.
See for instructions.
[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555 Jason Merrill changed: What|Removed |Added CC||reichelt at gcc dot gnu.org --- Comment #9 from Jason Merrill --- *** Bug 85256 has been marked as a duplicate of this bug. ***
[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555 --- Comment #8 from Jason Merrill --- Bug 79627 is a case where we would need to do some capture in unevaluated context, just as in C VLAs make sizeof non-constant.
[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555 --- Comment #7 from Jason Merrill --- Created attachment 43886 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43886&action=edit work in progress Here's the beginning of work for more general variably-modified type capture, based on the approach of capturing and remapping all the uses of outer automatic vars in the VLA type when the VLA variable is captured. Another approach would be to handle this later, when we actually do something that involves the dimensions; that could avoid some unnecessary captures, but currently the uses of the variable dimensions are hidden in ARRAY_REF, so we'd need to lower it to pointer arithmetic in affected cases.
[Bug c++/70555] lambda capture of multi-dimensional VLA
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70555 Jason Merrill changed: What|Removed |Added CC||jason at gcc dot gnu.org Summary|ICE in expand_expr_real_1 |lambda capture of |accessing a |multi-dimensional VLA |multi-dimensional VLA via | |lambda-capture | --- Comment #6 from Jason Merrill --- Let's make this bug the primary one for implementation of more general VLA/variably-modified type capture support.
