[LLVMbugs] [Bug 18018] New: CMake build fails with gcc 4.4.x on RHEL6

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18018

            Bug ID: 18018
           Summary: CMake build fails with gcc 4.4.x on RHEL6
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: hhinnant at apple.com
          Reporter: ryan.pavlik at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11585
  --> http://llvm.org/bugs/attachment.cgi?id=11585&action=edit
Build system patch as described above

This is because of the fact that bits/cxxabi_forced.h is known as
cxxabi-forced.h in that version. (see first comment on first answer here:
http://stackoverflow.com/questions/17917731/what-is-the-sanctioned-way-to-build-libc-for-clang-on-linux
)

A small change to the CMake scripts can work around this in a better way than
that SO post. The attached patch adds an option for CXX_ABI called libstdc++3,
which seems like the best idea at the time for distinguishing the older
libstdc++, though I now see that the soname is still 6.

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