gnu: LLVM, Clang: Update to 7.0.1.

* gnu/packages/patches/clang-7.0-libc-search-path.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/llvm.scm (llvm, clang-runtime, clang): Update to 7.0.1.
(llvm-7.0.1): Remove variable.
(clang-from-llvm)[arguments]: Adjust phase to match Clang 7.
(llvm-6, clang-runtime-6, clang-6): New public variables.
* gnu/packages/dlang.scm (ldc)[native-inputs]: Change LLVM and CLANG to
LLVM-6.0 and CLANG-6.0.
* gnu/packages/gl.scm (mesa)[inputs]: Change from LLVM to LLVM-6.

4 files changed, 112 insertions, 23 deletions

diff --git a/gnu/packages/dlang.scm b/gnu/packages/dlang.scm
index c03c24d9e2..2530b8a3c7 100644
--- a/gnu/packages/dlang.scm
+++ b/gnu/packages/dlang.scm
@@ -249,8 +249,8 @@ bootstrapping more recent compilers written in D.")
                       (setenv "CC" (string-append (assoc-ref inputs "gcc") "/bin/gcc"))
                       (invoke "make" "test" "-j" (number->string (parallel-job-count))))))))
       (native-inputs
-       `(("llvm" ,llvm)
-         ("clang" ,clang)
+       `(("llvm" ,llvm-6)
+         ("clang" ,clang-6)
          ("ldc" ,ldc-bootstrap)
          ("python-lit" ,python-lit)
          ("python-wrapper" ,python-wrapper)
diff --git a/gnu/packages/gl.scm b/gnu/packages/gl.scm
index b673cbffe6..37b8fce7cb 100644
--- a/gnu/packages/gl.scm
+++ b/gnu/packages/gl.scm
@@ -257,7 +257,7 @@ also known as DXTn or DXTC) for Mesa.")
         ("libxvmc" ,libxvmc)
         ,@(match (%current-system)
             ((or "x86_64-linux" "i686-linux")
-             `(("llvm" ,llvm)))
+             `(("llvm" ,llvm-6))) ;TODO: Change to LLVM in the next rebuild cycle.
             (_
              `()))
         ("makedepend" ,makedepend)
diff --git a/gnu/packages/llvm.scm b/gnu/packages/llvm.scm
index bea52ea480..9a4cca35d0 100644
--- a/gnu/packages/llvm.scm
+++ b/gnu/packages/llvm.scm
@@ -5,7 +5,7 @@
 ;;; Copyright © 2016 Dennis Mungai <dmngaie@gmail.com>
 ;;; Copyright © 2016, 2018 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2017 Roel Janssen <roel@gnu.org>
-;;; Copyright © 2018 Marius Bakke <mbakke@fastmail.com>
+;;; Copyright © 2018, 2019 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2018 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
@@ -47,7 +47,7 @@
 (define-public llvm
   (package
     (name "llvm")
-    (version "6.0.1")
+    (version "7.0.1")
     (source
      (origin
       (method url-fetch)
@@ -55,7 +55,7 @@
                           version "/llvm-" version ".src.tar.xz"))
       (sha256
        (base32
-        "1qpls3vk85lydi5b4axl0809fv932qgsqgdgrk098567z4jc7mmn"))))
+        "16s196wqzdw4pmri15hadzqgdi926zln3an2viwyq0kini6zr3d3"))))
     (build-system cmake-build-system)
     (native-inputs
      `(("python" ,python-2) ;bytes->str conversion in clang>=3.7 needs python-2
@@ -95,21 +95,6 @@ languages is in development.  The compiler infrastructure includes mirror sets
 of programming tools as well as libraries with equivalent functionality.")
     (license license:ncsa)))
 
-;; TODO: Build Mesa with LLVM 7 in the next staging cycle.
-;; TODO: Make LLVM 7 the default LLVM once Clang is also upgraded.
-(define-public llvm-7.0.1
-  (package (inherit llvm)
-    (name "llvm")
-    (version "7.0.1")
-    (source
-     (origin
-      (method url-fetch)
-      (uri (string-append "http://llvm.org/releases/"
-                          version "/llvm-" version ".src.tar.xz"))
-      (sha256
-       (base32
-        "16s196wqzdw4pmri15hadzqgdi926zln3an2viwyq0kini6zr3d3"))))))
-
 (define* (clang-runtime-from-llvm llvm hash
                                   #:optional (patches '()))
   (package
@@ -190,7 +175,7 @@ compiler.  In LLVM this library is called \"compiler-rt\".")
                            (compiler-rt (assoc-ref inputs "clang-runtime")))
                        (case (string->number ,(version-major
                                                (package-version clang-runtime)))
-                         ((6)
+                         ((or 6 7)
                           ;; Link to libclang_rt files from clang-runtime.
                           (substitute* "lib/Driver/ToolChain.cpp"
                             (("getDriver\\(\\)\\.ResourceDir")
@@ -277,10 +262,32 @@ code analysis tools.")
 (define-public clang-runtime
   (clang-runtime-from-llvm
    llvm
-   "1fcr3jn24yr8lh36nc0c4ikli4744i2q9m1ik67p1jymwwaixkgl"))
+   "065ybd8fsc4h2hikbdyricj6pyv4r7r7kpcikhb2y5zf370xybkq"))
 
 (define-public clang
   (clang-from-llvm llvm clang-runtime
+                   "067lwggnbg0w1dfrps790r5l6k8n5zwhlsw7zb6zvmfpwpfn4nx4"
+                   #:patches '("clang-7.0-libc-search-path.patch")))
+
+(define-public llvm-6
+  (package
+    (inherit llvm)
+    (version "6.0.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://llvm.org/releases/"
+                                  version "/llvm-" version ".src.tar.xz"))
+              (sha256
+               (base32
+                "1qpls3vk85lydi5b4axl0809fv932qgsqgdgrk098567z4jc7mmn"))))))
+
+(define-public clang-runtime-6
+  (clang-runtime-from-llvm
+   llvm-6
+   "1fcr3jn24yr8lh36nc0c4ikli4744i2q9m1ik67p1jymwwaixkgl"))
+
+(define-public clang-6
+  (clang-from-llvm llvm-6 clang-runtime
                    "0rxn4rh7rrnsqbdgp4gzc8ishbkryhpl1kd3mpnxzpxxhla3y93w"
                    #:patches '("clang-6.0-libc-search-path.patch")))
 
diff --git a/gnu/packages/patches/clang-7.0-libc-search-path.patch b/gnu/packages/patches/clang-7.0-libc-search-path.patch
new file mode 100644
index 0000000000..07ff8c90bd
--- /dev/null
+++ b/gnu/packages/patches/clang-7.0-libc-search-path.patch
@@ -0,0 +1,82 @@
+Clang attempts to guess file names based on the OS and distro (yes!),
+but unfortunately, that doesn't work for us.
+
+This patch makes it easy to insert libc's $libdir so that Clang passes the
+correct absolute file name of crt1.o etc. to 'ld'.  It also disables all
+the distro-specific stuff and removes the hard-coded FHS directory names
+to make sure Clang also works on non-GuixSD systems.
+
+--- a/lib/Driver/ToolChains/Linux.cpp
++++ b/lib/Driver/ToolChains/Linux.cpp
+@@ -225,7 +225,9 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+   PPaths.push_back(Twine(GCCInstallation.getParentLibPath() + "/../" +
+                          GCCInstallation.getTriple().str() + "/bin")
+                        .str());
+-
++  // Comment out the distro-specific tweaks so that they don't bite when
++  // using Guix on a foreign distro.
++#if 0
+   Distro Distro(D.getVFS());
+ 
+   if (Distro.IsAlpineLinux()) {
+@@ -284,6 +286,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+ 
+   if (IsAndroid || Distro.IsOpenSUSE())
+     ExtraOpts.push_back("--enable-new-dtags");
++#endif
+ 
+   // The selection of paths to try here is designed to match the patterns which
+   // the GCC driver itself uses, as this is part of the GCC-compatible driver.
+@@ -342,7 +345,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+     // the cross. Note that GCC does include some of these directories in some
+     // configurations but this seems somewhere between questionable and simply
+     // a bug.
+-    if (StringRef(LibPath).startswith(SysRoot)) {
++    if (0) {
+       addPathIfExists(D, LibPath + "/" + MultiarchTriple, Paths);
+       addPathIfExists(D, LibPath + "/../" + OSLibDir, Paths);
+     }
+@@ -361,6 +364,8 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+   addPathIfExists(D, SysRoot + "/lib/" + MultiarchTriple, Paths);
+   addPathIfExists(D, SysRoot + "/lib/../" + OSLibDir, Paths);
+ 
++  // This requires the commented distro tweaks above.
++#if 0
+   if (IsAndroid) {
+     // Android sysroots contain a library directory for each supported OS
+     // version as well as some unversioned libraries in the usual multiarch
+@@ -389,10 +394,14 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+     addPathIfExists(D, SysRoot + "/" + OSLibDir + "/" + ABIName, Paths);
+     addPathIfExists(D, SysRoot + "/usr/" + OSLibDir + "/" + ABIName, Paths);
+   }
++#endif
+ 
+   // Try walking via the GCC triple path in case of biarch or multiarch GCC
+   // installations with strange symlinks.
+   if (GCCInstallation.isValid()) {
++    // The following code would end up adding things like
++    // "/usr/lib/x86_64-unknown-linux-gnu/../../lib64" to the search path.
++#if 0
+     addPathIfExists(D,
+                     SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
+                         "/../../" + OSLibDir,
+@@ -405,6 +414,7 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+                              BiarchSibling.gccSuffix(),
+                       Paths);
+     }
++#endif
+ 
+     // See comments above on the multilib variant for details of why this is
+     // included even from outside the sysroot.
+@@ -429,8 +439,9 @@ Linux::Linux(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
+   if (StringRef(D.Dir).startswith(SysRoot))
+     addPathIfExists(D, D.Dir + "/../lib", Paths);
+ 
+-  addPathIfExists(D, SysRoot + "/lib", Paths);
+-  addPathIfExists(D, SysRoot + "/usr/lib", Paths);
++  // Add libc's lib/ directory to the search path, so that crt1.o, crti.o,
++  // and friends can be found.
++  addPathIfExists(D, "@GLIBC_LIBDIR@", Paths);
+ }
+ 
+ bool Linux::HasNativeLLVMSupport() const { return true; }