gnu: Remove clang-3.7.

* gnu/packages/llvm.scm (clang-3.7): Delete variable.
* gnu/packages/patches/clang-3.5-libc-search-path.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Unregister file.

Change-Id: Iacf6b9a8f7a70526ffadfdbd1a587d81fae1967f

gnu/local.mk

@@ -1089,7 +1089,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/cl-asdf-config-directories.patch		\
   %D%/packages/patches/clamav-config-llvm-libs.patch		\
   %D%/packages/patches/clamav-system-tomsfastmath.patch		\
-  %D%/packages/patches/clang-3.5-libc-search-path.patch		\
   %D%/packages/patches/clang-3.8-libc-search-path.patch		\
   %D%/packages/patches/clang-11.0-libc-search-path.patch	\
   %D%/packages/patches/clang-12.0-libc-search-path.patch	\

gnu/packages/llvm.scm

@@ -1108,12 +1108,6 @@ Library.")
                         (string-append (getcwd) "/lib"))))
             (delete 'install-opt-viewer)))))))
 
-(define-public clang-3.7
-  (clang-from-llvm llvm-3.7 clang-runtime-3.7
-                   "0x065d0w9b51xvdjxwfzjxng0gzpbx45fgiaxpap45ragi61dqjn"
-                   #:legacy-build-shared-libs? #t
-                   #:patches '("clang-3.5-libc-search-path.patch")))
-
 (define-public llvm-3.5
   (package (inherit llvm-3.7)
     (version "3.5.2")

gnu/packages/patches/clang-3.5-libc-search-path.patch

@@ -1,66 +0,0 @@
-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.
-
---- cfe-3.6.0.src/lib/Driver/ToolChains.cpp	2015-02-18 22:03:07.000000000 +0100
-+++ cfe-3.6.0.src/lib/Driver/ToolChains.cpp	2015-06-19 16:37:20.459701044 +0200
-@@ -2931,6 +2931,9 @@ Linux::Linux(const Driver &D, const llvm
- 
-   Linker = GetLinkerPath();
- 
-+  // Comment out the distro-specific tweaks so that they don't bite when
-+  // using Guix on a foreign distro.
-+#if 0
-   Distro Distro = DetectDistro(Arch);
- 
-   if (IsOpenSUSE(Distro) || IsUbuntu(Distro)) {
-@@ -2973,6 +2976,7 @@ Linux::Linux(const Driver &D, const llvm
- 
-   if (IsOpenSUSE(Distro))
-     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.
-@@ -3043,14 +3047,12 @@ Linux::Linux(const Driver &D, const llvm
-     addPathIfExists(D.Dir + "/../" + OSLibDir, Paths);
-   }
- 
--  addPathIfExists(SysRoot + "/lib/" + MultiarchTriple, Paths);
--  addPathIfExists(SysRoot + "/lib/../" + OSLibDir, Paths);
--  addPathIfExists(SysRoot + "/usr/lib/" + MultiarchTriple, Paths);
--  addPathIfExists(SysRoot + "/usr/lib/../" + OSLibDir, Paths);
--
-   // 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(SysRoot + "/usr/lib/" + GCCInstallation.getTriple().str() +
-                     "/../../" + OSLibDir, Paths);
- 
-@@ -3060,6 +3062,7 @@ Linux::Linux(const Driver &D, const llvm
-       addPathIfExists(GCCInstallation.getInstallPath() +
-                       BiarchSibling.gccSuffix(), Paths);
-     }
-+#endif
- 
-     // See comments above on the multilib variant for details of why this is
-     // included even from outside the sysroot.
-@@ -3083,8 +3086,9 @@ Linux::Linux(const Driver &D, const llvm
-   if (StringRef(D.Dir).startswith(SysRoot))
-     addPathIfExists(D.Dir + "/../lib", Paths);
- 
--  addPathIfExists(SysRoot + "/lib", Paths);
--  addPathIfExists(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("@GLIBC_LIBDIR@", Paths);
- }
- 
- bool Linux::HasNativeLLVMSupport() const {