[llvm-bugs] [Bug 46606] New: Missing -Wshadow warning in a try-catch block

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46606

            Bug ID: 46606
           Summary: Missing -Wshadow warning in a try-catch block
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: haoxintu at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Hi, all.

This code, test.cc, Clang might miss the -Wshadow warning message.

$cat test.cc
int var = 10;
int main(){
  try  { } catch ( int var )  { }
}

$clang++ -Wshadow test.cc
//emits nothing

$clang++ -v
clang version 11.0.0 (https://github.com/llvm/llvm-project
b9306fd042ce1c11d84f05d2124dfdc65b8331fe)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/haoxin/compilers/llvm-project/build/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64


While in gcc
$g++ -Wshadow test.cc
test.cc: In function ‘int main()’:
test.cc:3:24: warning: declaration of ‘var’ shadows a global declaration
[-Wshadow]
    3 |   try  { } catch ( int var )  { }
      |                        ^~~
test.cc:1:5: note: shadowed declaration is here
    1 | int var = 10;
      |     ^~~


Every version from clang 3.0 onwards behaves the same.

Thanks,
Haoxin

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