gnu: Remove libcxxabi-6.

* gnu/packages/llvm.scm (libcxxabi-6): Delete variable.

Change-Id: I5bfad857a489d4dd513a15aaec52668a0eeb3d81

gnu/packages/llvm.scm

@@ -1685,68 +1685,6 @@ use with Clang, targeting C++11, C++14 and above.")
     (native-inputs
      (list clang-6 llvm-6))))
 
-(define-public libcxxabi-6
-  (package
-    (name "libcxxabi")
-    (version "6.0.1")
-    (source
-     (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url "https://github.com/llvm/llvm-project")
-             (commit (string-append "llvmorg-" version))))
-       (file-name (git-file-name name version))
-       (sha256
-        (base32
-         "0ki6796b5z08kh3a3rbysr5wwb2dkl6wal5dzd03i4li5xfkvx1g"))))
-    (build-system cmake-build-system)
-    (arguments
-     (list
-      #:configure-flags
-      #~(list (string-append "-DLIBCXXABI_LIBCXX_INCLUDES="
-                             #$(this-package-native-input "libcxx")
-                             "/include")
-              "-DCMAKE_C_COMPILER=clang"
-              "-DCMAKE_CXX_COMPILER=clang++")
-      #:phases
-      #~(modify-phases (@ (guix build cmake-build-system) %standard-phases)
-          (add-after 'unpack 'chdir
-            (lambda _ (chdir "libcxxabi")))
-          (add-after 'set-paths 'adjust-CPLUS_INCLUDE_PATH
-            (lambda* (#:key inputs #:allow-other-keys)
-              (let ((gcc (assoc-ref inputs  "gcc")))
-                ;; Hide GCC's C++ headers so that they do not interfere with
-                ;; the ones we are attempting to build.
-                (setenv "CPLUS_INCLUDE_PATH"
-                        (string-join
-                         (cons (string-append
-                                (assoc-ref inputs "libcxx") "/include/c++/v1")
-                               (delete (string-append gcc "/include/c++")
-                                       (string-split
-                                        (getenv "CPLUS_INCLUDE_PATH")
-                                        #\:)))
-                         ":"))
-                (format
-                 #true
-                 "environment variable `CPLUS_INCLUDE_PATH' changed to ~a~%"
-                 (getenv "CPLUS_INCLUDE_PATH")))))
-          (add-after 'install 'install-headers
-            (lambda* (#:key outputs #:allow-other-keys)
-              (let ((include-dir (string-append
-                                  (assoc-ref outputs "out") "/include")))
-                (install-file "../libcxxabi/include/__cxxabi_config.h"
-                              include-dir)
-                (install-file "../libcxxabi/include/cxxabi.h"
-                              include-dir)))))))
-    (native-inputs
-     (list clang-6 llvm-6 libcxx-6))
-    (home-page "https://libcxxabi.llvm.org")
-    (synopsis "C++ standard library support")
-    (description
-     "This package provides an implementation of low level support for a
-standard C++ library.")
-    (license license:expat)))
-
 ;; WARNING: This package is a dependency of mesa.
 (define-public libclc
   (package