Language
C++
Compiler
gcc HEAD 11.0.0 20200908 (experimental)
Options
Warnings
Boost 1.73.0
C++2a
-pedantic
$ g++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/gcc-head/include -std=c++2a -pedantic Exit Code:
0
C++
gcc HEAD 11.0.0 20200908 (experimental)
$ g++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/gcc-head/include -std=c++2a -pedantic prog.cc:4:11: warning: ISO C++ forbids zero-size array 'a' [-Wpedantic]
4 | int a[0]; // C4200
| ^
prog.cc:4:9: warning: zero-size array member 'A::a' in an otherwise empty 'struct A' [-Wpedantic]
4 | int a[0]; // C4200
| ^
prog.cc:3:8: note: in the definition of 'struct A'
3 | struct A {
| ^