Created
October 15, 2018 04:54
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fujii@ubuntu3 $ cat a.cc | |
int main() | |
{ | |
int x; | |
return x; | |
} | |
fujii@ubuntu3 $ clang++ --version | |
,clang version 7.0.0 (tags/RELEASE_700/final) | |
Target: x86_64-unknown-linux-gnu | |
Thread model: posix | |
InstalledDir: /home/fujii/work/llvm/clang+llvm-7.0.0-x86_64-linux-gnu-ubuntu-16.04/bin | |
fujii@ubuntu3 $ clang++ -Wall -c a.cc | |
a.cc:5:10: warning: variable 'x' is uninitialized when used here [-Wuninitialized] | |
return x; | |
^ | |
a.cc:4:8: note: initialize the variable 'x' to silence this warning | |
int x; | |
^ | |
= 0 | |
1 warning generated. | |
fujii@ubuntu3 $ clang++ -Wall -Wno-uninitialized -c a.cc | |
fujii@ubuntu3 $ clang++ -Wno-uninitialized -Wall -c a.cc | |
a.cc:5:10: warning: variable 'x' is uninitialized when used here [-Wuninitialized] | |
return x; | |
^ | |
a.cc:4:8: note: initialize the variable 'x' to silence this warning | |
int x; | |
^ | |
= 0 | |
1 warning generated. | |
fujii@ubuntu3 $ clang++ -Wno-uninitialized -Wuninitialized -c a.cc | |
a.cc:5:10: warning: variable 'x' is uninitialized when used here [-Wuninitialized] | |
return x; | |
^ | |
a.cc:4:8: note: initialize the variable 'x' to silence this warning | |
int x; | |
^ | |
= 0 | |
1 warning generated. | |
fujii@ubuntu3 $ clang++ -Wuninitialized -Wno-uninitialized -c a.cc | |
fujii@ubuntu3 $ g++ --version | |
g++ (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0 | |
Copyright (C) 2017 Free Software Foundation, Inc. | |
This is free software; see the source for copying conditions. There is NO | |
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
fujii@ubuntu3 $ g++ -Wall -c a.cc | |
a.cc: In function ‘int main()’: | |
a.cc:5:10: warning: ‘x’ is used uninitialized in this function [-Wuninitialized] | |
return x; | |
^ | |
fujii@ubuntu3 $ g++ -Wall -Wno-uninitialized -c a.cc | |
fujii@ubuntu3 $ g++ -Wno-uninitialized -Wall -c a.cc | |
fujii@ubuntu3 $ g++ -Wno-uninitialized -Wuninitialized -c a.cc | |
a.cc: In function ‘int main()’: | |
a.cc:5:10: warning: ‘x’ is used uninitialized in this function [-Wuninitialized] | |
return x; | |
^ | |
fujii@ubuntu3 $ g++ -Wuninitialized -Wno-uninitialized -c a.cc | |
fujii@ubuntu3 $ |
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