[llvm-bugs] [Bug 26744] New: In x86-64 Cygwin, USER_LABEL_PREFIX should be empty

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26744

            Bug ID: 26744
           Summary: In x86-64 Cygwin, USER_LABEL_PREFIX should be empty
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tinysun.net at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

In Cygwin 64, the gcc compiler has not the underscore prefix as follows.

$ gcc -E -o - -dM -x c - < /dev/null | grep  USER
#define __USER_LABEL_PREFIX__

$ clang-3.5.2 -E -o - -dM -x c - < /dev/null | grep  USER
#define __USER_LABEL_PREFIX__ _

This macro is rarely used, but some library functions could not be linked. (ex.
basename(), BSD's qsort_r())

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