[llvm-bugs] [Bug 25665] New: cmake build system lacks a way to build libclang_rt without building libc++

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25665

            Bug ID: 25665
           Summary: cmake build system lacks a way to build libclang_rt
                    without building libc++
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jeremyhu at apple.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

In MacPorts, our clang ports build and install libclang_rt* from compiler-rt,
and the STL header from libc++, but NOT the libc++ runtime.

With the autoconf-based build system, this "just works", but with cmake, it
looks like we don't have a way to accomplish that.  The STL headers are
installed if libc++ is present in the source tree, but building and installing
libclang_rt and libc++ are controlled by the same cmake variable
(LLVM_BUILD_RUNTIME).

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