Language
C++
Compiler
clang 8.0.0
Options
Warnings
Boost 1.73.0
C++2a(GNU)
no pedantic
Raw compiler options
-Weverything
$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-8.0.0/include -std=gnu++2a -WeverythingExit Code:
0
C++
clang 8.0.0
$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-8.0.0/include -std=gnu++2a -Weverythingprog.cc:2:3: warning: no previous extern declaration for non-static variable 'a' [-Wmissing-variable-declarations]
A a;
^
prog.cc:2:3: warning: declaration requires an exit-time destructor [-Wexit-time-destructors]
prog.cc:2:3: warning: declaration requires a global destructor [-Wglobal-constructors]
3 warnings generated.