[LLVMbugs] [Bug 23529] New: Add support for gcc's attribute abi_tag (needed for compatibility with gcc 5's libstdc++)

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23529

            Bug ID: 23529
           Summary: Add support for gcc's attribute abi_tag (needed for
                    compatibility with gcc 5's libstdc++)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bero at linaro.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

With the release of gcc 5.1, libstdc++ has started using the abi_tag attribute.

The attribute is documented here:
https://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Attributes.html

Its use in libstdc++ and effects on ABI compatibility between gcc and clang are
pointed out here:
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg00153.html

It would be great if clang could support the abi_tag attribute and remain abi
compatible with gcc.

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