[llvm-bugs] [Bug 38160] New: init_priority breaks compilation of pmr::memory_resource with GCC on OS X

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38160

            Bug ID: 38160
           Summary: init_priority breaks compilation of
                    pmr::memory_resource with GCC on OS X
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldionne at apple.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

GCC on OSX can't compile pmr::memory_resource:

    # On OS X, with a Homebrew-installed GCC
    CXX_COMPILER="/usr/local/Cellar/gcc/8.1.0/bin/g++-8"
    C_COMPILER="/usr/local/Cellar/gcc/8.1.0/bin/gcc-8"

    cd root-of-llvm-monorepo
    mkdir build
    cd build
    cmake .. -DCMAKE_CXX_COMPILER=${CXX_COMPILER}
-DCMAKE_C_COMPILER=${C_COMPILER}
-DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi"
    cmake --build . --target cxx_experimental


This produces:

    /Users/ldionne/work/llvm/libcxx/src/experimental/memory_resource.cpp:76:65:
error: 'init_priority' attribute is not supported on this platform
     ResourceInitHelper res_init  __attribute__((init_priority (101)));
                                                                     ^
    ninja: build stopped: subcommand failed.

The problem seems to be that `init_priority` is not an attribute supported by
GCC on OS X. Is there any way we can use something else when for GCC on OSX?

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