added alarm/llvm37

2024-11-08 22:45:43 +00:00 · 2016-06-12 16:08:57 +00:00 · 2016-06-12 16:08:57 +00:00 · d9dd59f356
commit d9dd59f356
parent 3239ba0be2
9 changed files with 2240 additions and 0 deletions
--- a/alarm/llvm37/0001-New-MSan-mapping-layout-compiler-rt-part.patch
+++ b/alarm/llvm37/0001-New-MSan-mapping-layout-compiler-rt-part.patch
@ -0,0 +1,142 @@
+From 0bee2d927c97454e629b0789c7f4e3d509cf4178 Mon Sep 17 00:00:00 2001
+From: Evgeniy Stepanov <eugeni.stepanov@gmail.com>
+Date: Thu, 8 Oct 2015 21:35:34 +0000
+Subject: [PATCH] New MSan mapping layout (compiler-rt part).
+
+This is an implementation of
+https://github.com/google/sanitizers/issues/579
+
+It has a number of advantages over the current mapping:
+* Works for non-PIE executables.
+* Does not require ASLR; as a consequence, debugging MSan programs in
+  gdb no longer requires "set disable-randomization off".
+* Supports linux kernels >=4.1.2.
+* The code is marginally faster and smaller.
+
+This is an ABI break. We never really promised ABI stability, but
+this patch includes a courtesy escape hatch: a compile-time macro
+that reverts back to the old mapping layout.
+
+git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@249754 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/msan/msan.h                                    | 23 ++++++++++++++++++++++
+ lib/msan/msan_allocator.cc                         |  8 +++++++-
+ test/msan/mmap.cc                                  |  4 +++-
+ test/msan/strlen_of_shadow.cc                      |  2 +-
+ .../TestCases/Posix/decorate_proc_maps.cc          |  4 ++--
+ 5 files changed, 36 insertions(+), 5 deletions(-)
+
+diff --git a/lib/msan/msan.h b/lib/msan/msan.h
+index 3776fa9..2d77983 100644
+--- a/lib/msan/msan.h
+++ b/lib/msan/msan.h
+@@ -135,6 +135,7 @@ const MappingDesc kMemoryLayout[] = {
+ 
+ #elif SANITIZER_LINUX && SANITIZER_WORDSIZE == 64
+ 
+#ifdef MSAN_LINUX_X86_64_OLD_MAPPING
+ // Requries PIE binary and ASLR enabled.
+ // Main thread stack and DSOs at 0x7f0000000000 (sometimes 0x7e0000000000).
+ // Heap at 0x600000000000.
+@@ -146,6 +147,28 @@ const MappingDesc kMemoryLayout[] = {
+ 
+ #define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
+ #define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x200000000000ULL)
+#else  // MSAN_LINUX_X86_64_OLD_MAPPING
+// All of the following configurations are supported.
+// ASLR disabled: main executable and DSOs at 0x555550000000
+// PIE and ASLR: main executable and DSOs at 0x7f0000000000
+// non-PIE: main executable below 0x100000000, DSOs at 0x7f0000000000
+// Heap at 0x700000000000.
+const MappingDesc kMemoryLayout[] = {
+    {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app-1"},
+    {0x010000000000ULL, 0x100000000000ULL, MappingDesc::SHADOW, "shadow-2"},
+    {0x100000000000ULL, 0x110000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x110000000000ULL, 0x200000000000ULL, MappingDesc::ORIGIN, "origin-2"},
+    {0x200000000000ULL, 0x300000000000ULL, MappingDesc::SHADOW, "shadow-3"},
+    {0x300000000000ULL, 0x400000000000ULL, MappingDesc::ORIGIN, "origin-3"},
+    {0x400000000000ULL, 0x500000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x500000000000ULL, 0x510000000000ULL, MappingDesc::SHADOW, "shadow-1"},
+    {0x510000000000ULL, 0x600000000000ULL, MappingDesc::APP, "app-2"},
+    {0x600000000000ULL, 0x610000000000ULL, MappingDesc::ORIGIN, "origin-1"},
+    {0x610000000000ULL, 0x700000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x700000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app-3"}};
+#define MEM_TO_SHADOW(mem) (((uptr)(mem)) ^ 0x500000000000ULL)
+#define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x100000000000ULL)
+#endif  // MSAN_LINUX_X86_64_OLD_MAPPING
+ 
+ #else
+ #error "Unsupported platform"
+diff --git a/lib/msan/msan_allocator.cc b/lib/msan/msan_allocator.cc
+index 865a458..b7d3947 100644
+--- a/lib/msan/msan_allocator.cc
+++ b/lib/msan/msan_allocator.cc
+@@ -49,15 +49,21 @@ struct MsanMapUnmapCallback {
+   typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, sizeof(Metadata),
+                                SizeClassMap, kRegionSizeLog, ByteMap,
+                                MsanMapUnmapCallback> PrimaryAllocator;
+
+ #elif defined(__x86_64__)
+#if SANITIZER_LINUX && !defined(MSAN_LINUX_X86_64_OLD_MAPPING)
+  static const uptr kAllocatorSpace = 0x700000000000ULL;
+#else
+   static const uptr kAllocatorSpace = 0x600000000000ULL;
+-  static const uptr kAllocatorSize   = 0x80000000000;  // 8T.
+#endif
+  static const uptr kAllocatorSize = 0x80000000000; // 8T.
+   static const uptr kMetadataSize  = sizeof(Metadata);
+   static const uptr kMaxAllowedMallocSize = 8UL << 30;
+ 
+   typedef SizeClassAllocator64<kAllocatorSpace, kAllocatorSize, kMetadataSize,
+                              DefaultSizeClassMap,
+                              MsanMapUnmapCallback> PrimaryAllocator;
+
+ #elif defined(__powerpc64__)
+   static const uptr kAllocatorSpace = 0x300000000000;
+   static const uptr kAllocatorSize  = 0x020000000000;  // 2T
+diff --git a/test/msan/mmap.cc b/test/msan/mmap.cc
+index 250ce34..962836c 100644
+--- a/test/msan/mmap.cc
+++ b/test/msan/mmap.cc
+@@ -15,7 +15,9 @@ bool AddrIsApp(void *p) {
+ #if defined(__FreeBSD__) && defined(__x86_64__)
+   return addr < 0x010000000000ULL || addr >= 0x600000000000ULL;
+ #elif defined(__x86_64__)
+-  return addr >= 0x600000000000ULL;
+  return (addr >= 0x000000000000ULL && addr < 0x010000000000ULL) ||
+         (addr >= 0x510000000000ULL && addr < 0x600000000000ULL) ||
+         (addr >= 0x700000000000ULL && addr < 0x800000000000ULL);
+ #elif defined(__mips64)
+   return addr >= 0x00e000000000ULL;
+ #elif defined(__powerpc64__)
+diff --git a/test/msan/strlen_of_shadow.cc b/test/msan/strlen_of_shadow.cc
+index fee9223..0594f00 100644
+--- a/test/msan/strlen_of_shadow.cc
+++ b/test/msan/strlen_of_shadow.cc
+@@ -12,7 +12,7 @@
+ 
+ const char *mem_to_shadow(const char *p) {
+ #if defined(__x86_64__)
+-  return (char *)((uintptr_t)p & ~0x400000000000ULL);
+  return (char *)((uintptr_t)p ^ 0x500000000000ULL);
+ #elif defined (__mips64)
+   return (char *)((uintptr_t)p & ~0x4000000000ULL);
+ #elif defined(__powerpc64__)
+diff --git a/test/sanitizer_common/TestCases/Posix/decorate_proc_maps.cc b/test/sanitizer_common/TestCases/Posix/decorate_proc_maps.cc
+index 8744c3f..36d4df5 100644
+--- a/test/sanitizer_common/TestCases/Posix/decorate_proc_maps.cc
+++ b/test/sanitizer_common/TestCases/Posix/decorate_proc_maps.cc
+@@ -47,8 +47,8 @@ int main(void) {
+ // CHECK-asan: rw-p {{.*}} [high shadow]
+ 
+ // CHECK-msan: ---p {{.*}} [invalid]
+-// CHECK-msan: rw-p {{.*}} [shadow]
+-// CHECK-msan: ---p {{.*}} [origin]
+// CHECK-msan: rw-p {{.*}} [shadow{{.*}}]
+// CHECK-msan: ---p {{.*}} [origin{{.*}}]
+ 
+ // CHECK-tsan: rw-p {{.*}} [shadow]
+ // CHECK-tsan: rw-p {{.*}} [meta shadow]
+-- 
+2.6.1
+
--- a/alarm/llvm37/0001-New-MSan-mapping-layout-llvm-part.patch
+++ b/alarm/llvm37/0001-New-MSan-mapping-layout-llvm-part.patch
@ -0,0 +1,115 @@
+From 2c87d24da09ecd2c14c38a0b4f7a0e3f332b08ee Mon Sep 17 00:00:00 2001
+From: Evgeniy Stepanov <eugeni.stepanov@gmail.com>
+Date: Thu, 8 Oct 2015 21:35:26 +0000
+Subject: [PATCH] New MSan mapping layout (llvm part).
+
+This is an implementation of
+https://github.com/google/sanitizers/issues/579
+
+It has a number of advantages over the current mapping:
+* Works for non-PIE executables.
+* Does not require ASLR; as a consequence, debugging MSan programs in
+  gdb no longer requires "set disable-randomization off".
+* Supports linux kernels >=4.1.2.
+* The code is marginally faster and smaller.
+
+This is an ABI break. We never really promised ABI stability, but
+this patch includes a courtesy escape hatch: a compile-time macro
+that reverts back to the old mapping layout.
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@249753 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Transforms/Instrumentation/MemorySanitizer.cpp | 22 +++++++++++++++-------
+ .../MemorySanitizer/origin-alignment.ll            | 10 ++++++----
+ 2 files changed, 21 insertions(+), 11 deletions(-)
+
+diff --git a/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+index 9d4c7de..bc6da5a 100644
+--- a/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+@@ -232,10 +232,17 @@ static const MemoryMapParams Linux_I386_MemoryMapParams = {
+ 
+ // x86_64 Linux
+ static const MemoryMapParams Linux_X86_64_MemoryMapParams = {
+#ifdef MSAN_LINUX_X86_64_OLD_MAPPING
+   0x400000000000,  // AndMask
+   0,               // XorMask (not used)
+   0,               // ShadowBase (not used)
+   0x200000000000,  // OriginBase
+#else
+  0,               // AndMask (not used)
+  0x500000000000,  // XorMask
+  0,               // ShadowBase (not used)
+  0x100000000000,  // OriginBase
+#endif
+ };
+ 
+ // mips64 Linux
+@@ -926,16 +933,17 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
+   ///
+   /// Offset = (Addr & ~AndMask) ^ XorMask
+   Value *getShadowPtrOffset(Value *Addr, IRBuilder<> &IRB) {
+    Value *OffsetLong = IRB.CreatePointerCast(Addr, MS.IntptrTy);
+
+     uint64_t AndMask = MS.MapParams->AndMask;
+-    assert(AndMask != 0 && "AndMask shall be specified");
+-    Value *OffsetLong =
+-      IRB.CreateAnd(IRB.CreatePointerCast(Addr, MS.IntptrTy),
+-                    ConstantInt::get(MS.IntptrTy, ~AndMask));
+    if (AndMask)
+      OffsetLong =
+          IRB.CreateAnd(OffsetLong, ConstantInt::get(MS.IntptrTy, ~AndMask));
+ 
+     uint64_t XorMask = MS.MapParams->XorMask;
+-    if (XorMask != 0)
+-      OffsetLong = IRB.CreateXor(OffsetLong,
+-                                 ConstantInt::get(MS.IntptrTy, XorMask));
+    if (XorMask)
+      OffsetLong =
+          IRB.CreateXor(OffsetLong, ConstantInt::get(MS.IntptrTy, XorMask));
+     return OffsetLong;
+   }
+ 
+diff --git a/test/Instrumentation/MemorySanitizer/origin-alignment.ll b/test/Instrumentation/MemorySanitizer/origin-alignment.ll
+index ce0dbfc..562d194 100644
+--- a/test/Instrumentation/MemorySanitizer/origin-alignment.ll
+++ b/test/Instrumentation/MemorySanitizer/origin-alignment.ll
+@@ -24,7 +24,7 @@ entry:
+ ; CHECK-ORIGINS1: [[ORIGIN:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN0:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN:%[01-9a-z]+]] = call i32 @__msan_chain_origin(i32 [[ORIGIN0]])
+-; CHECK: store i32 [[ORIGIN]],  i32* inttoptr (i64 add (i64 and (i64 ptrtoint {{.*}} to i32*), align 8
+; CHECK: store i32 [[ORIGIN]], i32* inttoptr (i64 add (i64 xor (i64 ptrtoint (i8* @a8 to i64), i64 {{.*}}), i64 {{.*}}) to i32*), align 8
+ ; CHECK: ret void
+ 
+ 
+@@ -39,7 +39,7 @@ entry:
+ ; CHECK-ORIGINS1: [[ORIGIN:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN0:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN:%[01-9a-z]+]] = call i32 @__msan_chain_origin(i32 [[ORIGIN0]])
+-; CHECK: store i32 [[ORIGIN]],  i32* inttoptr (i64 add (i64 and (i64 ptrtoint {{.*}} to i32*), align 4
+; CHECK: store i32 [[ORIGIN]], i32* inttoptr (i64 add (i64 xor (i64 ptrtoint (i8* @a4 to i64), i64 {{.*}}), i64 {{.*}}) to i32*), align 4
+ ; CHECK: ret void
+ 
+ 
+@@ -54,7 +54,8 @@ entry:
+ ; CHECK-ORIGINS1: [[ORIGIN:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN0:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN:%[01-9a-z]+]] = call i32 @__msan_chain_origin(i32 [[ORIGIN0]])
+-; CHECK: store i32 [[ORIGIN]],  i32* inttoptr (i64 and (i64 add (i64 and (i64 ptrtoint {{.*}} i64 -4) to i32*), align 4
+; CHECK: store i32 [[ORIGIN]],  i32* inttoptr (i64 and (i64 add (i64 xor (i64 ptrtoint (i8* @a2 to i64), i64 {{.*}}), i64 {{.*}}), i64 -4) to i32*), align 4
+
+ ; CHECK: ret void
+ 
+ 
+@@ -69,5 +70,6 @@ entry:
+ ; CHECK-ORIGINS1: [[ORIGIN:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN0:%[01-9a-z]+]] = load {{.*}} @__msan_param_origin_tls
+ ; CHECK-ORIGINS2: [[ORIGIN:%[01-9a-z]+]] = call i32 @__msan_chain_origin(i32 [[ORIGIN0]])
+-; CHECK: store i32 [[ORIGIN]],  i32* inttoptr (i64 and (i64 add (i64 and (i64 ptrtoint {{.*}} i64 -4) to i32*), align 4
+; CHECK: store i32 [[ORIGIN]], i32* inttoptr (i64 and (i64 add (i64 xor (i64 ptrtoint (i8* @a1 to i64), i64 {{.*}}), i64 {{.*}}), i64 -4) to i32*), align 4
+
+ ; CHECK: ret void
+-- 
+2.6.1
+
--- a/alarm/llvm37/PKGBUILD
+++ b/alarm/llvm37/PKGBUILD
@ -0,0 +1,227 @@
+# $Id$
+# Maintainer: Evangelos Foutras <evangelos@foutrelis.com>
+# Contributor: Jan "heftig" Steffens <jan.steffens@gmail.com>
+# Contributor: Sebastian Nowicki <sebnow@gmail.com>
+# Contributor: Devin Cofer <ranguvar{AT]archlinux[DOT}us>
+# Contributor: Tobias Kieslich <tobias@justdreams.de>
+# Contributor: Geoffroy Carrier <geoffroy.carrier@aur.archlinux.org>
+# Contributor: Tomas Lindquist Olsen <tomas@famolsen.dk>
+# Contributor: Roberto Alsina <ralsina@kde.org>
+# Contributor: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>
+
+# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
+#  - v5: disable compiler-rt, don't install in clang package
+#  - v8: disable lldb, unsupported architecture
+#  - this package only exists for GHC
+
+buildarch=4
+
+pkgname=('llvm37' 'llvm37-libs' 'clang37' )
+pkgver=3.7.1
+pkgrel=1
+_ocaml_ver=4.02.3
+arch=('i686' 'x86_64')
+url="http://llvm.org/"
+license=('custom:University of Illinois/NCSA Open Source License')
+makedepends=('cmake' 'libffi' 'python2' "ocaml=$_ocaml_ver" 'python-sphinx'
+             'ocaml-ctypes' 'ocaml-findlib' 'libedit' 'swig')
+# Use gcc-multilib to build 32-bit compiler-rt libraries on x86_64 (FS#41911)
+makedepends_x86_64=('gcc-multilib')
+options=('staticlibs')
+source=(http://llvm.org/releases/$pkgver/llvm-$pkgver.src.tar.xz{,.sig}
+        http://llvm.org/releases/$pkgver/cfe-$pkgver.src.tar.xz{,.sig}
+        http://llvm.org/releases/$pkgver/clang-tools-extra-$pkgver.src.tar.xz{,.sig}
+        http://llvm.org/releases/$pkgver/compiler-rt-$pkgver.src.tar.xz{,.sig}
+        http://llvm.org/releases/$pkgver/lldb-$pkgver.src.tar.xz{,.sig}
+        llvm-3.7.0-link-tools-against-libLLVM.patch
+        llvm-3.7.0-export-more-symbols.patch
+        clang-3.7.0-add-gcc-abi-tag-support.patch
+        clang-tools-extra-3.7.0-install-clang-query.patch
+        lldb-3.7.0-avoid-linking-to-libLLVM.patch
+        0001-New-MSan-mapping-layout-llvm-part.patch
+        0001-New-MSan-mapping-layout-compiler-rt-part.patch
+        llvm-Config-llvm-config.h)
+sha256sums=('be7794ed0cec42d6c682ca8e3517535b54555a3defabec83554dbc74db545ad5'
+            'SKIP'
+            '56e2164c7c2a1772d5ed2a3e57485ff73ff06c97dff12edbeea1acc4412b0674'
+            'SKIP'
+            '4a91edaccad1ce984c7c49a4a87db186b7f7b21267b2b03bcf4bd7820715bc6b'
+            'SKIP'
+            '9d4769e4a927d3824bcb7a9c82b01e307c68588e6de4e7f04ab82d82c5af8181'
+            'SKIP'
+            '9a0bc315ef55f44c98cdf92d064df0847f453ed156dd0ef6a87e04f5fd6a0e01'
+            'SKIP'
+            'cf9c8b4d70b4547eda162644658c5c203c3139fcea6c75003b6cd7dc11a8cccc'
+            'a1c9f36b97c639666ab6a1bd647a08a027e93e3d3cfd6f5af9c36e757599ce81'
+            '5ed52d54612829402b63bc500bfefae75b3dc444a1524849c26cadf7e0ae4b7d'
+            '3abf85430c275ecb8dbb526ecb82b1c9f4b4f782a8a43b5a06d040ec0baba7e7'
+            '2d53b6ed4c7620eeade87e7761b98093a0434801ddd599056daed7881141fb01'
+            'c5f4e329143bef36b623ba5daf311b5a73fa99ab05fed4ba506c1c3bc4cf5ee7'
+            'f44e8fe3cef9b6f706d651f443922261e1dcf53bcaabdd0ac7edb1758e4bc44d'
+            '597dc5968c695bbdbb0eac9e8eb5117fcd2773bc91edf5ec103ecffffab8bc48')
+validpgpkeys=('11E521D646982372EB577A1F8F0871F202119294'
+              'B6C8F98282B944E3B0D5C2530FC3042E345AD05D')
+
+prepare() {
+  cd "$srcdir/llvm-$pkgver.src"
+
+  # At the present, clang must reside inside the LLVM source code tree to build
+  # See http://llvm.org/bugs/show_bug.cgi?id=4840
+  mv "$srcdir/cfe-$pkgver.src" tools/clang
+
+  mv "$srcdir/clang-tools-extra-$pkgver.src" tools/clang/tools/extra
+
+  mv "$srcdir/compiler-rt-$pkgver.src" projects/compiler-rt
+
+  mv "$srcdir/lldb-$pkgver.src" tools/lldb
+
+  # Backport LLVM_LINK_LLVM_DYLIB option
+  # https://bugs.archlinux.org/task/46392
+  patch -Np1 -i ../llvm-3.7.0-link-tools-against-libLLVM.patch
+
+  # https://llvm.org/bugs/show_bug.cgi?id=24157
+  patch -Np2 -i ../llvm-3.7.0-export-more-symbols.patch
+
+  # https://llvm.org/bugs/show_bug.cgi?id=23529
+  # http://reviews.llvm.org/D12834
+  patch -d tools/clang -Np0 <../clang-3.7.0-add-gcc-abi-tag-support.patch
+
+  # https://llvm.org/bugs/show_bug.cgi?id=24046
+  # Upstreamed - http://reviews.llvm.org/D13206
+  patch -d tools/clang/tools/extra -Np1 <../clang-tools-extra-3.7.0-install-clang-query.patch
+
+  # https://llvm.org/bugs/show_bug.cgi?id=24953
+  patch -d tools/lldb -Np1 <../lldb-3.7.0-avoid-linking-to-libLLVM.patch
+
+  # https://llvm.org/bugs/show_bug.cgi?id=24155
+  patch -Np1 -i ../0001-New-MSan-mapping-layout-llvm-part.patch
+  patch -d projects/compiler-rt -Np1 <../0001-New-MSan-mapping-layout-compiler-rt-part.patch
+
+  # Use Python 2
+  find tools/lldb -name Makefile -exec sed -i 's/python-config/python2-config/' {} +
+  sed -i 's|/usr/bin/env python|&2|' \
+    tools/lldb/scripts/Python/{build-swig-Python,finish-swig-Python-LLDB}.sh
+
+  mkdir build
+}
+
+build() {
+  cd "$srcdir/llvm-$pkgver.src/build"
+
+  [[ $CARCH == "arm" ]] && CONFIG="-DLLVM_EXTERNAL_COMPILER_RT_BUILD=OFF"
+  [[ $CARCH == "aarch64" ]] && CONFIG="-DLLVM_EXTERNAL_LLDB_BUILD=OFF"
+
+  cmake \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DLLVM_BUILD_LLVM_DYLIB=ON \
+    -DLLVM_DYLIB_EXPORT_ALL=ON \
+    -DLLVM_LINK_LLVM_DYLIB=ON \
+    -DLLVM_ENABLE_RTTI=ON \
+    -DLLVM_ENABLE_FFI=ON \
+    -DLLVM_BUILD_TESTS=ON \
+    -DLLVM_BUILD_DOCS=ON \
+    -DLLVM_ENABLE_SPHINX=ON \
+    -DLLVM_ENABLE_DOXYGEN=OFF \
+    -DSPHINX_WARNINGS_AS_ERRORS=OFF \
+    -DFFI_INCLUDE_DIR=$(pkg-config --variable=includedir libffi) \
+    -DLLVM_BINUTILS_INCDIR=/usr/include \
+    $CONFIG ..
+
+  make
+  make ocaml_doc
+
+  # Disable automatic installation of components that go into subpackages
+  sed -i '/\(clang\|lldb\)\/cmake_install.cmake/d' tools/cmake_install.cmake
+  sed -i '/extra\/cmake_install.cmake/d' tools/clang/tools/cmake_install.cmake
+  sed -i '/compiler-rt\/cmake_install.cmake/d' projects/cmake_install.cmake
+}
+
+check() {
+  cd "$srcdir/llvm-$pkgver.src/build"
+  make check
+  make check-clang || warning \
+    'Ignoring Clang test failures caused by name mangling differences'
+}
+
+package_llvm37() {
+  pkgdesc="Low Level Virtual Machine"
+  depends=("llvm37-libs=$pkgver-$pkgrel" 'perl')
+  conflicts=('llvm' 'llvm35')
+
+  cd "$srcdir/llvm-$pkgver.src"
+
+  make -C build DESTDIR="$pkgdir" install
+
+  # Remove documentation sources
+  rm -r "$pkgdir"/usr/share/doc/llvm/html/{_sources,.buildinfo}
+
+  # The runtime libraries go into llvm-libs
+  mv -f "$pkgdir"/usr/lib/lib{LLVM,LTO}.so* "$srcdir"
+  mv -f "$pkgdir"/usr/lib/LLVMgold.so "$srcdir"
+
+  # OCaml bindings go to a separate package
+  rm -rf "$srcdir"/ocaml.{lib,doc}
+  mv "$pkgdir/usr/lib/ocaml" "$srcdir/ocaml.lib"
+  mv "$pkgdir/usr/docs/ocaml/html" "$srcdir/ocaml.doc"
+  rm -r "$pkgdir/usr/docs"
+
+  if [[ $CARCH == x86_64 ]]; then
+    # Needed for multilib (https://bugs.archlinux.org/task/29951)
+    # Header stub is taken from Fedora
+    mv "$pkgdir/usr/include/llvm/Config/llvm-config"{,-64}.h
+    cp "$srcdir/llvm-Config-llvm-config.h" \
+      "$pkgdir/usr/include/llvm/Config/llvm-config.h"
+  fi
+
+  install -Dm644 LICENSE.TXT "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}
+
+package_llvm37-libs() {
+  pkgdesc="Low Level Virtual Machine (runtime libraries)"
+  depends=('gcc-libs' 'zlib' 'libffi' 'libedit' 'ncurses')
+
+  install -d "$pkgdir/usr/lib"
+  cp -P \
+    "$srcdir"/lib{LLVM,LTO}.so* \
+    "$srcdir"/LLVMgold.so \
+    "$pkgdir/usr/lib/"
+
+  # Symlink LLVMgold.so from /usr/lib/bfd-plugins
+  # https://bugs.archlinux.org/task/28479
+  install -d "$pkgdir/usr/lib/bfd-plugins"
+  ln -s ../LLVMgold.so "$pkgdir/usr/lib/bfd-plugins/LLVMgold.so"
+
+  install -Dm644 "$srcdir/llvm-$pkgver.src/LICENSE.TXT" \
+    "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}
+
+package_clang37() {
+  pkgdesc="C language family frontend for LLVM"
+  url="http://clang.llvm.org/"
+  depends=("llvm37-libs=$pkgver-$pkgrel" 'gcc')
+  optdepends=('python2: for git-clang-format')
+  conflicts=('clang' 'clang35')
+
+  cd "$srcdir/llvm-$pkgver.src"
+
+  make -C build/tools/clang DESTDIR="$pkgdir" install
+  [[ $CARCH != "arm" ]] && make -C build/projects/compiler-rt DESTDIR="$pkgdir" install
+
+  # Remove documentation sources
+  rm -r "$pkgdir"/usr/share/doc/clang/html/{_sources,.buildinfo}
+
+  # Install Python bindings
+  install -d "$pkgdir/usr/lib/python2.7/site-packages"
+  cp -a tools/clang/bindings/python/clang "$pkgdir/usr/lib/python2.7/site-packages/"
+  python2 -m compileall "$pkgdir/usr/lib/python2.7/site-packages/clang"
+  python2 -O -m compileall "$pkgdir/usr/lib/python2.7/site-packages/clang"
+
+  # Use Python 2
+  sed -i 's|/usr/bin/env python|&2|' \
+    "$pkgdir/usr/bin/git-clang-format" \
+    "$pkgdir/usr/share/clang/clang-format-diff.py"
+
+  install -Dm644 tools/clang/LICENSE.TXT \
+    "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}
--- a/alarm/llvm37/clang-3.7.0-add-gcc-abi-tag-support.patch
+++ b/alarm/llvm37/clang-3.7.0-add-gcc-abi-tag-support.patch
--- a/alarm/llvm37/clang-tools-extra-3.7.0-install-clang-query.patch
+++ b/alarm/llvm37/clang-tools-extra-3.7.0-install-clang-query.patch
@ -0,0 +1,9 @@
+diff -upr clang-tools-extra-3.7.0.src.orig/clang-query/tool/CMakeLists.txt clang-tools-extra-3.7.0.src/clang-query/tool/CMakeLists.txt
+--- clang-tools-extra-3.7.0.src.orig/clang-query/tool/CMakeLists.txt	2015-06-20 22:28:07.000000000 +0300
+++ clang-tools-extra-3.7.0.src/clang-query/tool/CMakeLists.txt	2015-09-28 11:51:14.724472237 +0300
+@@ -10,3 +10,5 @@ target_link_libraries(clang-query
+   clangQuery
+   clangTooling
+   )
+
+install(TARGETS clang-query RUNTIME DESTINATION bin)
--- a/alarm/llvm37/lldb-3.7.0-avoid-linking-to-libLLVM.patch
+++ b/alarm/llvm37/lldb-3.7.0-avoid-linking-to-libLLVM.patch
@ -0,0 +1,20 @@
+diff -upr lldb-3.7.0.src.orig/cmake/modules/AddLLDB.cmake lldb-3.7.0.src/cmake/modules/AddLLDB.cmake
+--- lldb-3.7.0.src.orig/cmake/modules/AddLLDB.cmake	2015-09-28 11:42:23.439084000 +0300
+++ lldb-3.7.0.src/cmake/modules/AddLLDB.cmake	2015-09-28 11:43:03.200237733 +0300
+@@ -56,7 +56,7 @@ macro(add_lldb_library name)
+   if (PARAM_OBJECT)
+     add_library(${name} ${libkind} ${srcs})
+   else()
+-    llvm_add_library(${name} ${libkind} ${srcs})
+    llvm_add_library(${name} ${libkind} DISABLE_LLVM_LINK_LLVM_DYLIB ${srcs})
+ 
+     lldb_link_common_libs(${name} "${libkind}")
+ 
+@@ -93,6 +93,6 @@ macro(add_lldb_library name)
+ endmacro(add_lldb_library)
+ 
+ macro(add_lldb_executable name)
+-  add_llvm_executable(${name} ${ARGN})
+  add_llvm_executable(${name} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARGN})
+   set_target_properties(${name} PROPERTIES FOLDER "lldb executables")
+ endmacro(add_lldb_executable)
--- a/alarm/llvm37/llvm-3.7.0-export-more-symbols.patch
+++ b/alarm/llvm37/llvm-3.7.0-export-more-symbols.patch
@ -0,0 +1,11 @@
+--- src/llvm/tools/llvm-shlib/CMakeLists.txt.orig	2015-09-06 12:31:21.765250429 +0300
+++ src/llvm/tools/llvm-shlib/CMakeLists.txt	2015-09-06 13:17:10.820174432 +0300
+@@ -64,7 +64,7 @@
+ 
+   if (LLVM_DYLIB_EXPORT_ALL)
+     add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
+-      COMMAND echo \"LLVM*\" > ${LLVM_EXPORTED_SYMBOL_FILE} && echo \"_Z*llvm*\" >> ${LLVM_EXPORTED_SYMBOL_FILE}
+      COMMAND echo -e \"LLVM*\\n_Z*llvm*\\nConvertUTF*\\ngetNumBytesForUTF8\\nisLegalUTF8*\" > ${LLVM_EXPORTED_SYMBOL_FILE}
+       WORKING_DIRECTORY ${LIB_DIR}
+       DEPENDS ${LLVM_DYLIB_REQUIRED_EXPORTS}
+       COMMENT "Generating combined export list...")
--- a/alarm/llvm37/llvm-3.7.0-link-tools-against-libLLVM.patch
+++ b/alarm/llvm37/llvm-3.7.0-link-tools-against-libLLVM.patch
@ -0,0 +1,440 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index ac3b978..dd50236 100644
+--- a/CMakeLists.txt
+++ b/CMakeLists.txt
+@@ -342,9 +342,21 @@ option (LLVM_ENABLE_SPHINX "Use Sphinx to generate llvm documentation." OFF)
+ option (LLVM_BUILD_EXTERNAL_COMPILER_RT
+   "Build compiler-rt as an external project." OFF)
+ 
+-option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" OFF)
+-option(LLVM_DYLIB_EXPORT_ALL "Export all symbols from libLLVM.dylib (default is C API only" OFF)
+-option(LLVM_DISABLE_LLVM_DYLIB_ATEXIT "Disable llvm-shlib's atexit destructors." ON)
+# You can configure which libraries from LLVM you want to include in the
+# shared library by setting LLVM_DYLIB_COMPONENTS to a semi-colon delimited
+# list of LLVM components. All component names handled by llvm-config are valid.
+if(NOT DEFINED LLVM_DYLIB_COMPONENTS)
+  set(LLVM_DYLIB_COMPONENTS "all" CACHE STRING
+    "Semicolon-separated list of components to include in libLLVM, or \"all\".")
+endif()
+option(LLVM_LINK_LLVM_DYLIB "Link tools against the libllvm dynamic library" OFF)
+option(LLVM_BUILD_LLVM_DYLIB "Build libllvm dynamic library" ${LLVM_LINK_LLVM_DYLIB})
+option(LLVM_DYLIB_EXPORT_ALL "Export all symbols from libLLVM.dylib (default is C API only" ${LLVM_LINK_LLVM_DYLIB})
+set(LLVM_DISABLE_LLVM_DYLIB_ATEXIT_DEFAULT ON)
+if (LLVM_LINK_LLVM_DYLIB)
+  set(LLVM_DISABLE_LLVM_DYLIB_ATEXIT_DEFAULT OFF)
+endif()
+option(LLVM_DISABLE_LLVM_DYLIB_ATEXIT "Disable llvm-shlib's atexit destructors." ${LLVM_DISABLE_LLVM_DYLIB_ATEXIT_DEFAULT})
+ if(LLVM_DISABLE_LLVM_DYLIB_ATEXIT)
+   set(DISABLE_LLVM_DYLIB_ATEXIT 1)
+ endif()
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index 45f6746..6b6e6e0 100644
+--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
+@@ -41,7 +41,7 @@ function(llvm_update_compile_flags name)
+   # Assume that;
+   #   - LLVM_COMPILE_FLAGS is list.
+   #   - PROPERTY COMPILE_FLAGS is string.
+-  string(REPLACE ";" " " target_compile_flags "${LLVM_COMPILE_FLAGS}")
+  string(REPLACE ";" " " target_compile_flags " ${LLVM_COMPILE_FLAGS}")
+ 
+   if(update_src_props)
+     foreach(fn ${sources})
+@@ -303,6 +303,9 @@ endfunction(set_windows_version_resource_properties)
+ #   MODULE
+ #     Target ${name} might not be created on unsupported platforms.
+ #     Check with "if(TARGET ${name})".
+#   DISABLE_LLVM_LINK_LLVM_DYLIB
+#     Do not link this library to libLLVM, even if
+#     LLVM_LINK_LLVM_DYLIB is enabled.
+ #   OUTPUT_NAME name
+ #     Corresponds to OUTPUT_NAME in target properties.
+ #   DEPENDS targets...
+@@ -316,7 +319,7 @@ endfunction(set_windows_version_resource_properties)
+ #   )
+ function(llvm_add_library name)
+   cmake_parse_arguments(ARG
+-    "MODULE;SHARED;STATIC"
+    "MODULE;SHARED;STATIC;DISABLE_LLVM_LINK_LLVM_DYLIB"
+     "OUTPUT_NAME"
+     "ADDITIONAL_HEADERS;DEPENDS;LINK_COMPONENTS;LINK_LIBS;OBJLIBS"
+     ${ARGN})
+@@ -444,10 +447,14 @@ function(llvm_add_library name)
+   # property has been set to an empty value.
+   get_property(lib_deps GLOBAL PROPERTY LLVMBUILD_LIB_DEPS_${name})
+ 
+-  llvm_map_components_to_libnames(llvm_libs
+-    ${ARG_LINK_COMPONENTS}
+-    ${LLVM_LINK_COMPONENTS}
+-    )
+  if (LLVM_LINK_LLVM_DYLIB AND NOT ARG_STATIC AND NOT ARG_DISABLE_LLVM_LINK_LLVM_DYLIB)
+    set(llvm_libs LLVM)
+  else()
+    llvm_map_components_to_libnames(llvm_libs
+      ${ARG_LINK_COMPONENTS}
+      ${LLVM_LINK_COMPONENTS}
+      )
+  endif()
+ 
+   if(CMAKE_VERSION VERSION_LESS 2.8.12)
+     # Link libs w/o keywords, assuming PUBLIC.
+@@ -562,7 +569,22 @@ endmacro(add_llvm_loadable_module name)
+ 
+ 
+ macro(add_llvm_executable name)
+-  llvm_process_sources( ALL_FILES ${ARGN} )
+  cmake_parse_arguments(ARG "DISABLE_LLVM_LINK_LLVM_DYLIB" "" "" ${ARGN})
+  llvm_process_sources( ALL_FILES ${ARG_UNPARSED_ARGUMENTS} )
+
+  # Generate objlib
+  if(LLVM_ENABLE_OBJLIB)
+    # Generate an obj library for both targets.
+    set(obj_name "obj.${name}")
+    add_library(${obj_name} OBJECT EXCLUDE_FROM_ALL
+      ${ALL_FILES}
+      )
+    llvm_update_compile_flags(${obj_name})
+    set(ALL_FILES "$<TARGET_OBJECTS:${obj_name}>")
+
+    set_target_properties(${obj_name} PROPERTIES FOLDER "Object Libraries")
+  endif()
+
+   add_windows_version_resource_file(ALL_FILES ${ALL_FILES})
+ 
+   if( EXCLUDE_FROM_ALL )
+@@ -588,9 +610,13 @@ macro(add_llvm_executable name)
+     add_llvm_symbol_exports( ${name} ${LLVM_EXPORTED_SYMBOL_FILE} )
+   endif(LLVM_EXPORTED_SYMBOL_FILE)
+ 
+  if (LLVM_LINK_LLVM_DYLIB AND NOT ARG_DISABLE_LLVM_LINK_LLVM_DYLIB)
+    set(USE_SHARED USE_SHARED)
+  endif()
+
+   set(EXCLUDE_FROM_ALL OFF)
+   set_output_directory(${name} ${LLVM_RUNTIME_OUTPUT_INTDIR} ${LLVM_LIBRARY_OUTPUT_INTDIR})
+-  llvm_config( ${name} ${LLVM_LINK_COMPONENTS} )
+  llvm_config( ${name} ${USE_SHARED} ${LLVM_LINK_COMPONENTS} )
+   if( LLVM_COMMON_DEPENDS )
+     add_dependencies( ${name} ${LLVM_COMMON_DEPENDS} )
+   endif( LLVM_COMMON_DEPENDS )
+@@ -651,7 +677,7 @@ endmacro(add_llvm_example name)
+ 
+ 
+ macro(add_llvm_utility name)
+-  add_llvm_executable(${name} ${ARGN})
+  add_llvm_executable(${name} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARGN})
+   set_target_properties(${name} PROPERTIES FOLDER "Utils")
+   if( LLVM_INSTALL_UTILS )
+     install (TARGETS ${name}
+@@ -785,8 +811,13 @@ function(llvm_add_go_executable binary pkgpath)
+       set(cppflags "${cppflags} -I${d}")
+     endforeach(d)
+     set(ldflags "${CMAKE_EXE_LINKER_FLAGS}")
+    if (LLVM_LINK_LLVM_DYLIB)
+      set(linkmode "dylib")
+    else()
+      set(linkmode "component-libs")
+    endif()
+     add_custom_command(OUTPUT ${binpath}
+-      COMMAND ${CMAKE_BINARY_DIR}/bin/llvm-go "cc=${cc}" "cxx=${cxx}" "cppflags=${cppflags}" "ldflags=${ldflags}"
+      COMMAND ${CMAKE_BINARY_DIR}/bin/llvm-go "go=${GO_EXECUTABLE}" "cc=${cc}" "cxx=${cxx}" "cppflags=${cppflags}" "ldflags=${ldflags}" "linkmode=${linkmode}"
+               ${ARG_GOFLAGS} build -o ${binpath} ${pkgpath}
+       DEPENDS llvm-config ${CMAKE_BINARY_DIR}/bin/llvm-go${CMAKE_EXECUTABLE_SUFFIX}
+               ${llvmlibs} ${ARG_DEPENDS}
+diff --git a/cmake/modules/LLVM-Config.cmake b/cmake/modules/LLVM-Config.cmake
+index 22ac714..aa68b40 100644
+--- a/cmake/modules/LLVM-Config.cmake
+++ b/cmake/modules/LLVM-Config.cmake
+@@ -31,7 +31,23 @@ endfunction(is_llvm_target_library)
+ 
+ 
+ macro(llvm_config executable)
+-  explicit_llvm_config(${executable} ${ARGN})
+  cmake_parse_arguments(ARG "USE_SHARED" "" "" ${ARGN})
+  set(link_components ${ARG_UNPARSED_ARGUMENTS})
+
+  if(USE_SHARED)
+    # If USE_SHARED is specified, then we link against libLLVM,
+    # but also against the component libraries below. This is
+    # done in case libLLVM does not contain all of the components
+    # the target requires.
+    #
+    # TODO strip LLVM_DYLIB_COMPONENTS out of link_components.
+    # To do this, we need special handling for "all", since that
+    # may imply linking to libraries that are not included in
+    # libLLVM.
+    target_link_libraries(${executable} LLVM)
+  endif()
+
+  explicit_llvm_config(${executable} ${link_components})
+ endmacro(llvm_config)
+ 
+ 
+diff --git a/cmake/modules/TableGen.cmake b/cmake/modules/TableGen.cmake
+index 85d720e..fcb445a 100644
+--- a/cmake/modules/TableGen.cmake
+++ b/cmake/modules/TableGen.cmake
+@@ -73,6 +73,10 @@ endfunction()
+ macro(add_tablegen target project)
+   set(${target}_OLD_LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS})
+   set(LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS} TableGen)
+
+  # FIXME: It leaks to user, callee of add_tablegen.
+  set(LLVM_ENABLE_OBJLIB ON)
+
+   add_llvm_utility(${target} ${ARGN})
+   set(LLVM_LINK_COMPONENTS ${${target}_OLD_LLVM_LINK_COMPONENTS})
+ 
+diff --git a/tools/llvm-go/llvm-go.go b/tools/llvm-go/llvm-go.go
+index c5c3fd2..ed79ca6 100644
+--- a/tools/llvm-go/llvm-go.go
+++ b/tools/llvm-go/llvm-go.go
+@@ -24,6 +24,11 @@ import (
+ 	"strings"
+ )
+ 
+const (
+	linkmodeComponentLibs = "component-libs"
+	linkmodeDylib         = "dylib"
+)
+
+ type pkg struct {
+ 	llvmpath, pkgpath string
+ }
+@@ -66,11 +71,12 @@ var components = []string{
+ func llvmConfig(args ...string) string {
+ 	configpath := os.Getenv("LLVM_CONFIG")
+ 	if configpath == "" {
+-		// strip llvm-go, add llvm-config
+-		configpath = os.Args[0][:len(os.Args[0])-7] + "llvm-config"
+		bin, _ := filepath.Split(os.Args[0])
+		configpath = filepath.Join(bin, "llvm-config")
+ 	}
+ 
+ 	cmd := exec.Command(configpath, args...)
+	cmd.Stderr = os.Stderr
+ 	out, err := cmd.Output()
+ 	if err != nil {
+ 		panic(err.Error())
+@@ -78,11 +84,21 @@ func llvmConfig(args ...string) string {
+ 
+ 	outstr := string(out)
+ 	outstr = strings.TrimSuffix(outstr, "\n")
+-	return strings.Replace(outstr, "\n", " ", -1)
+	outstr = strings.Replace(outstr, "\n", " ", -1)
+	return outstr
+ }
+ 
+-func llvmFlags() compilerFlags {
+-	ldflags := llvmConfig(append([]string{"--ldflags", "--libs", "--system-libs"}, components...)...)
+func llvmFlags(linkmode string) compilerFlags {
+	ldflags := llvmConfig("--ldflags")
+	switch linkmode {
+	case linkmodeComponentLibs:
+		ldflags += " " + llvmConfig(append([]string{"--libs"}, components...)...)
+	case linkmodeDylib:
+		ldflags += " -lLLVM"
+	default:
+		panic("invalid linkmode: " + linkmode)
+	}
+	ldflags += " " + llvmConfig("--system-libs")
+ 	if runtime.GOOS != "darwin" {
+ 		// OS X doesn't like -rpath with cgo. See:
+ 		// https://code.google.com/p/go/issues/detail?id=7293
+@@ -117,8 +133,8 @@ func printComponents() {
+ 	fmt.Println(strings.Join(components, " "))
+ }
+ 
+-func printConfig() {
+-	flags := llvmFlags()
+func printConfig(linkmode string) {
+	flags := llvmFlags(linkmode)
+ 
+ 	fmt.Printf(`// +build !byollvm
+ 
+@@ -137,7 +153,7 @@ type (run_build_sh int)
+ `, flags.cpp, flags.cxx, flags.ld)
+ }
+ 
+-func runGoWithLLVMEnv(args []string, cc, cxx, gocmd, llgo, cppflags, cxxflags, ldflags string) {
+func runGoWithLLVMEnv(args []string, cc, cxx, gocmd, llgo, cppflags, cxxflags, ldflags, linkmode string) {
+ 	args = addTag(args, "byollvm")
+ 
+ 	srcdir := llvmConfig("--src-root")
+@@ -166,7 +182,7 @@ func runGoWithLLVMEnv(args []string, cc, cxx, gocmd, llgo, cppflags, cxxflags, l
+ 	newgopathlist = append(newgopathlist, filepath.SplitList(os.Getenv("GOPATH"))...)
+ 	newgopath := strings.Join(newgopathlist, string(filepath.ListSeparator))
+ 
+-	flags := llvmFlags()
+	flags := llvmFlags(linkmode)
+ 
+ 	newenv := []string{
+ 		"CC=" + cc,
+@@ -178,7 +194,7 @@ func runGoWithLLVMEnv(args []string, cc, cxx, gocmd, llgo, cppflags, cxxflags, l
+ 		"PATH=" + newpath,
+ 	}
+ 	if llgo != "" {
+-		newenv = append(newenv, "GCCGO=" + llgo)
+		newenv = append(newenv, "GCCGO="+llgo)
+ 	}
+ 
+ 	for _, v := range os.Environ() {
+@@ -234,45 +250,44 @@ func main() {
+ 	ldflags := os.Getenv("CGO_LDFLAGS")
+ 	gocmd := "go"
+ 	llgo := ""
+	linkmode := linkmodeComponentLibs
+
+	flags := []struct {
+		name string
+		dest *string
+	}{
+		{"cc", &cc},
+		{"cxx", &cxx},
+		{"go", &gocmd},
+		{"llgo", &llgo},
+		{"cppflags", &cppflags},
+		{"ldflags", &ldflags},
+		{"linkmode", &linkmode},
+	}
+ 
+ 	args := os.Args[1:]
+-	DONE: for {
+-		switch {
+-		case len(args) == 0:
+LOOP:
+	for {
+		if len(args) == 0 {
+ 			usage()
+-		case strings.HasPrefix(args[0], "cc="):
+-			cc = args[0][3:]
+-			args = args[1:]
+-		case strings.HasPrefix(args[0], "cxx="):
+-			cxx = args[0][4:]
+-			args = args[1:]
+-		case strings.HasPrefix(args[0], "go="):
+-			gocmd = args[0][3:]
+-			args = args[1:]
+-		case strings.HasPrefix(args[0], "llgo="):
+-			llgo = args[0][5:]
+-			args = args[1:]
+-		case strings.HasPrefix(args[0], "cppflags="):
+-			cppflags = args[0][9:]
+-			args = args[1:]
+-		case strings.HasPrefix(args[0], "cxxflags="):
+-			cxxflags = args[0][9:]
+-			args = args[1:]
+-		case strings.HasPrefix(args[0], "ldflags="):
+-			ldflags = args[0][8:]
+-			args = args[1:]
+-		default:
+-			break DONE
+ 		}
+		for _, flag := range flags {
+			if strings.HasPrefix(args[0], flag.name+"=") {
+				*flag.dest = args[0][len(flag.name)+1:]
+				args = args[1:]
+				continue LOOP
+			}
+		}
+		break
+ 	}
+ 
+ 	switch args[0] {
+ 	case "build", "get", "install", "run", "test":
+-		runGoWithLLVMEnv(args, cc, cxx, gocmd, llgo, cppflags, cxxflags, ldflags)
+		runGoWithLLVMEnv(args, cc, cxx, gocmd, llgo, cppflags, cxxflags, ldflags, linkmode)
+ 	case "print-components":
+ 		printComponents()
+ 	case "print-config":
+-		printConfig()
+		printConfig(linkmode)
+ 	default:
+ 		usage()
+ 	}
+diff --git a/tools/llvm-shlib/CMakeLists.txt b/tools/llvm-shlib/CMakeLists.txt
+index 54d71d3..d9bd15f 100644
+--- a/tools/llvm-shlib/CMakeLists.txt
+++ b/tools/llvm-shlib/CMakeLists.txt
+@@ -2,42 +2,6 @@
+ # library is enabled by setting LLVM_BUILD_LLVM_DYLIB=yes on the CMake
+ # commandline. By default the shared library only exports the LLVM C API.
+ 
+-
+-# You can configure which libraries from LLVM you want to include in the shared
+-# library by setting LLVM_DYLIB_COMPONENTS to a semi-colon delimited list of
+-# LLVM components. All compoenent names handled by llvm-config are valid.
+-
+-if(NOT DEFINED LLVM_DYLIB_COMPONENTS)
+-  set(LLVM_DYLIB_COMPONENTS
+-    ${LLVM_TARGETS_TO_BUILD}
+-    Analysis
+-    BitReader
+-    BitWriter
+-    CodeGen
+-    Core
+-    DebugInfoDWARF
+-    DebugInfoPDB
+-    ExecutionEngine
+-    IPA
+-    IPO
+-    IRReader
+-    InstCombine
+-    Instrumentation
+-    Interpreter
+-    Linker
+-    MCDisassembler
+-    MCJIT
+-    ObjCARCOpts
+-    Object
+-    ScalarOpts
+-    Support
+-    Target
+-    TransformUtils
+-    Vectorize
+-    native
+-    )
+-endif()
+-
+ add_definitions( -DLLVM_VERSION_INFO=\"${PACKAGE_VERSION}\" )
+ 
+ set(SOURCES
+@@ -46,6 +10,29 @@ set(SOURCES
+ 
+ llvm_map_components_to_libnames(LIB_NAMES ${LLVM_DYLIB_COMPONENTS})
+ 
+if(LLVM_LINK_LLVM_DYLIB)
+  if(NOT LLVM_DYLIB_EXPORT_ALL)
+    message(FATAL_ERROR "LLVM_DYLIB_EXPORT_ALL must be ON when LLVM_LINK_LLVM_DYLIB is ON")
+  endif()
+
+  # libLLVM.so should not have any dependencies on any other LLVM
+  # shared libraries. When using the "all" pseudo-component,
+  # LLVM_AVAILABLE_LIBS is added to the dependencies, which may
+  # contain shared libraries (e.g. libLTO).
+  #
+  # Also exclude libLLVMTableGen for the following reasons:
+  #  - it is only used by internal *-tblgen utilities;
+  #  - it pollutes the global options space.
+  foreach(lib ${LIB_NAMES})
+    get_target_property(t ${lib} TYPE)
+    if("${lib}" STREQUAL "LLVMTableGen")
+    elseif("x${t}" STREQUAL "xSTATIC_LIBRARY")
+      list(APPEND FILTERED_LIB_NAMES ${lib})
+    endif()
+  endforeach()
+  set(LIB_NAMES ${FILTERED_LIB_NAMES})
+endif()
+
+ if(NOT DEFINED LLVM_DYLIB_EXPORTED_SYMBOL_FILE)
+ 
+   if( WIN32 AND NOT CYGWIN )
+@@ -95,7 +82,7 @@ else()
+   add_custom_target(libLLVMExports DEPENDS ${LLVM_EXPORTED_SYMBOL_FILE})
+ endif()
+ 
+-add_llvm_library(LLVM SHARED ${SOURCES})
+add_llvm_library(LLVM SHARED DISABLE_LLVM_LINK_LLVM_DYLIB ${SOURCES})
+ 
+ list(REMOVE_DUPLICATES LIB_NAMES)
+ if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux") # FIXME: It should be "GNU ld for elf"
--- a/alarm/llvm37/llvm-Config-llvm-config.h
+++ b/alarm/llvm37/llvm-Config-llvm-config.h
@ -0,0 +1,9 @@
+#include <bits/wordsize.h>
+
+#if __WORDSIZE == 32
+#include "llvm-config-32.h"
+#elif __WORDSIZE == 64
+#include "llvm-config-64.h"
+#else
+#error "Unknown word size"
+#endif