[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408 Paolo Carlini paolo.carlini at oracle dot com changed: What|Removed |Added Status|ASSIGNED|RESOLVED CC|jason at gcc dot gnu.org | Resolution|--- |FIXED Target Milestone|--- |4.9.0 --- Comment #7 from Paolo Carlini paolo.carlini at oracle dot com --- Thus fixed for 4.9.0.
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408 Paolo Carlini paolo.carlini at oracle dot com changed: What|Removed |Added CC|superbem at gmail dot com |jason at gcc dot gnu.org --- Comment #5 from Paolo Carlini paolo.carlini at oracle dot com --- Jason, at first I thought this one could be a Dup of 55149 but I'm still seeing it today.
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408 Jason Merrill jason at gcc dot gnu.org changed: What|Removed |Added Keywords||ice-on-invalid-code Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |jason at gcc dot gnu.org --- Comment #6 from Jason Merrill jason at gcc dot gnu.org --- The issue here is that this capture is not valid C++1y because an array bound other than the first one is non-constant. Current 4.9 gives an error and then crashes; I'll fix the crash, but it will still be rejected.
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408 Paolo Carlini paolo.carlini at oracle dot com changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed||2013-06-20 Ever confirmed|0 |1
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408 --- Comment #4 from superbem at gmail dot com --- Thanks for further testing it. Isn't this confirmed yet? How to do. I've stumbled across this issue several times, and I'm very admired that I'm the only one.
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408 --- Comment #1 from Paolo Carlini paolo.carlini at oracle dot com --- I'm not at all sure this is a C++ front-end issue.
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408
Daniel Krügler daniel.kruegler at googlemail dot com changed:
What|Removed |Added
CC||daniel.kruegler@googlemail.
||com
--- Comment #2 from Daniel Krügler daniel.kruegler at googlemail dot com ---
First attempt so simplify (and to get rid of some library dependencies):
//-
#include functional
struct Impl_base
{
virtual ~Impl_base(){}
virtual void run() = 0;
};
templatetypename Callable
struct Impl : public Impl_base
{
Callable func;
Impl(Callable f) : func(f) { }
void run() { func(); }
};
templatetypename Callable
void
make_routine(Callable f)
{
new ImplCallable(static_castCallable(f));
}
templatetypename Callable
void make(Callable f)
{
make_routine(std::__bind_simple(f));
}
extern void use(float);
int main(){
int y = 2;
float fa[2][y]; // compiles fine if y were 2 hard-coded instead
fa[0][0]=0.8;
fa[0][1]=1.8;
auto fx=[](){
for(int c=0; c2; c++){ // compiles fine if c2 were c1 instead
use(fa[0][c]);
}
};
make(fx); //error (1*)
}
//-
causes the same error (using gcc 4.9.0 20130519 (experimental)):
main.cpp||In function 'int main()':|
main.cpp|34|warning: ISO C++ forbids variable length array 'fa' [-Wvla]|
main.cpp||In member function 'void ImplCallable::run() [with Callable =
std::_Bind_simplemain()::lambda()()]':|
main.cpp|39|warning: 'anonymous' is used uninitialized in this function
[-Wuninitialized]|
|34|note: 'anonymous' was declared here|
main.cpp|39|internal compiler error: in expand_expr_real_1, at expr.c:9361|
[Bug c++/57408] lambda, Variable length arrays, thread, internal compiler error: in expand_expr_real_1, at expr.c:9327
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57408
--- Comment #3 from Daniel Krügler daniel.kruegler at googlemail dot com ---
Further simplification down to a library-free test case:
//--
templatetypename Callable
struct Impl
{
Callable func;
Impl(Callable f) : func(f) { }
virtual void run() { func(); }
};
templatetypename Callable
void call(Callable f)
{
ImplCallable(f).run();
}
extern C int printf(const char*, ...);
int main(){
int y = 2;
float fa[2][y]; // compiles fine if y were 2 hard-coded instead
fa[0][0]=0.8;
fa[0][1]=1.8;
auto fx=[](){
for(int c=0; c2; c++){ // compiles fine if c2 were c1 instead
printf(use me, fa[0][c]);
}
};
call(fx); //error (1*)
}
//--
It seems relevant, that there is a virtual function that invokes the lambda
closure and that fa[0][c] is odr-used within the closure call expression.
