[llvm-bugs] [Bug 38569] New: dont emit -Wreturn-stack-address in single case

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Aug 14 16:13:09 PDT 2018


https://bugs.llvm.org/show_bug.cgi?id=38569

            Bug ID: 38569
           Summary: dont emit -Wreturn-stack-address in single case
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ndesaulniers at google.com
                CC: llozano at chromium.org, llvm-bugs at lists.llvm.org,
                    srhines at google.com

>From https://github.com/ClangBuiltLinux/linux/issues/24:

The Linux kernel uses the following construct often:

#define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })

This produces -Wreturn-stack-address (in Clang 7+) for the label, but generates
the expected code.

I think we can detect returning the address of a label in a GNU-C-extension
statement expression, that has nothing between the label and the final
statement, and not emit the warning?

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