sys-devel/llvm: Backport binutils compatibility patch to 6.0.1

Backport the patch necessary to make LLVM assembly compatible
with new restrictions in binutils-2.31.1.

Closes: https://bugs.gentoo.org/663442

2 files changed, 580 insertions, 0 deletions

diff --git a/sys-devel/llvm/files/6.0.1/0002-llvm-mc-Produce-R_X86_64_PLT32-for-call-jmp-foo.patch b/sys-devel/llvm/files/6.0.1/0002-llvm-mc-Produce-R_X86_64_PLT32-for-call-jmp-foo.patch
new file mode 100644
index 000000000000..eac5fe44178e
--- /dev/null
+++ b/sys-devel/llvm/files/6.0.1/0002-llvm-mc-Produce-R_X86_64_PLT32-for-call-jmp-foo.patch
@@ -0,0 +1,314 @@
+From 9ff352cb602d5dd68bcd7bf2ba4711c8568271a9 Mon Sep 17 00:00:00 2001
+From: George Rimar <grimar@accesssoftek.com>
+Date: Tue, 20 Feb 2018 10:17:57 +0000
+Subject: [PATCH] [llvm-mc] - Produce R_X86_64_PLT32 for "call/jmp foo".
+
+For instructions like call foo and jmp foo patch changes
+relocation produced from R_X86_64_PC32 to R_X86_64_PLT32.
+Relocation can be used as a marker for 32-bit PC-relative branches.
+Linker will reduce PLT32 relocation to PC32 if function is defined locally.
+
+Differential revision: https://reviews.llvm.org/D43383
+
+git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@325569 91177308-0d34-0410-b5e6-96231b3b80d8
+---
+ lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp |  3 ++
+ .../X86/MCTargetDesc/X86ELFObjectWriter.cpp   |  3 ++
+ lib/Target/X86/MCTargetDesc/X86FixupKinds.h   |  1 +
+ .../X86/MCTargetDesc/X86MCCodeEmitter.cpp     | 32 +++++++++++++++++--
+ .../X86/MCTargetDesc/X86MachObjectWriter.cpp  |  1 +
+ .../MCTargetDesc/X86WinCOFFObjectWriter.cpp   |  1 +
+ test/CodeGen/X86/cmp.ll                       |  2 +-
+ test/CodeGen/X86/fma.ll                       |  8 ++---
+ test/MC/ELF/basic-elf-64.s                    | 18 ++++++-----
+ test/MC/ELF/ifunc-reloc.s                     |  2 +-
+ test/MC/ELF/weak-diff.s                       |  2 +-
+ test/MC/ELF/weak-relocation.s                 |  2 +-
+ test/MC/ELF/weakref-reloc.s                   |  2 +-
+ 13 files changed, 58 insertions(+), 19 deletions(-)
+
+diff --git a/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp b/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+index 34db5918926..b301722b535 100644
+--- a/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
++++ b/lib/Target/X86/MCTargetDesc/X86AsmBackend.cpp
+@@ -46,6 +46,7 @@ static unsigned getFixupKindLog2Size(unsigned Kind) {
+   case X86::reloc_signed_4byte:
+   case X86::reloc_signed_4byte_relax:
+   case X86::reloc_global_offset_table:
++  case X86::reloc_branch_4byte_pcrel:
+   case FK_SecRel_4:
+   case FK_Data_4:
+     return 2;
+@@ -95,6 +96,7 @@ public:
+         {"reloc_signed_4byte_relax", 0, 32, 0},
+         {"reloc_global_offset_table", 0, 32, 0},
+         {"reloc_global_offset_table8", 0, 64, 0},
++        {"reloc_branch_4byte_pcrel", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
+     };
+ 
+     if (Kind < FirstTargetFixupKind)
+@@ -102,6 +104,7 @@ public:
+ 
+     assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
+            "Invalid kind!");
++    assert(Infos[Kind - FirstTargetFixupKind].Name && "Empty fixup name!");
+     return Infos[Kind - FirstTargetFixupKind];
+   }
+ 
+diff --git a/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp b/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
+index 4cdbae4d0d9..2ecbb80cd06 100644
+--- a/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
++++ b/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp
+@@ -75,6 +75,9 @@ static X86_64RelType getType64(unsigned Kind,
+   case X86::reloc_riprel_4byte_relax_rex:
+   case X86::reloc_riprel_4byte_movq_load:
+     return RT64_32;
++  case X86::reloc_branch_4byte_pcrel:
++    Modifier = MCSymbolRefExpr::VK_PLT;
++    return RT64_32;
+   case FK_PCRel_2:
+   case FK_Data_2:
+     return RT64_16;
+diff --git a/lib/Target/X86/MCTargetDesc/X86FixupKinds.h b/lib/Target/X86/MCTargetDesc/X86FixupKinds.h
+index dfdc9ec29ae..3c04b13e002 100644
+--- a/lib/Target/X86/MCTargetDesc/X86FixupKinds.h
++++ b/lib/Target/X86/MCTargetDesc/X86FixupKinds.h
+@@ -30,6 +30,7 @@ enum Fixups {
+                                              // of the instruction. Used only
+                                              // for _GLOBAL_OFFSET_TABLE_.
+   reloc_global_offset_table8,                // 64-bit variant.
++  reloc_branch_4byte_pcrel,                  // 32-bit PC relative branch.
+   // Marker
+   LastTargetFixupKind,
+   NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind
+diff --git a/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp b/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
+index 4ddc1f0ba42..608dc4acb04 100644
+--- a/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
++++ b/lib/Target/X86/MCTargetDesc/X86MCCodeEmitter.cpp
+@@ -152,6 +152,8 @@ public:
+ 
+   uint8_t DetermineREXPrefix(const MCInst &MI, uint64_t TSFlags,
+                              int MemOperand, const MCInstrDesc &Desc) const;
++
++  bool isPCRel32Branch(const MCInst &MI) const;
+ };
+ 
+ } // end anonymous namespace
+@@ -276,6 +278,22 @@ static bool HasSecRelSymbolRef(const MCExpr *Expr) {
+   return false;
+ }
+ 
++bool X86MCCodeEmitter::isPCRel32Branch(const MCInst &MI) const {
++  unsigned Opcode = MI.getOpcode();
++  const MCInstrDesc &Desc = MCII.get(Opcode);
++  if ((Opcode != X86::CALL64pcrel32 && Opcode != X86::JMP_4) ||
++      getImmFixupKind(Desc.TSFlags) != FK_PCRel_4)
++    return false;
++
++  unsigned CurOp = X86II::getOperandBias(Desc);
++  const MCOperand &Op = MI.getOperand(CurOp);
++  if (!Op.isExpr())
++    return false;
++
++  const MCSymbolRefExpr *Ref = dyn_cast<MCSymbolRefExpr>(Op.getExpr());
++  return Ref && Ref->getKind() == MCSymbolRefExpr::VK_None;
++}
++
+ void X86MCCodeEmitter::
+ EmitImmediate(const MCOperand &DispOp, SMLoc Loc, unsigned Size,
+               MCFixupKind FixupKind, unsigned &CurByte, raw_ostream &OS,
+@@ -331,7 +349,8 @@ EmitImmediate(const MCOperand &DispOp, SMLoc Loc, unsigned Size,
+       FixupKind == MCFixupKind(X86::reloc_riprel_4byte) ||
+       FixupKind == MCFixupKind(X86::reloc_riprel_4byte_movq_load) ||
+       FixupKind == MCFixupKind(X86::reloc_riprel_4byte_relax) ||
+-      FixupKind == MCFixupKind(X86::reloc_riprel_4byte_relax_rex))
++      FixupKind == MCFixupKind(X86::reloc_riprel_4byte_relax_rex) ||
++      FixupKind == MCFixupKind(X86::reloc_branch_4byte_pcrel))
+     ImmOffset -= 4;
+   if (FixupKind == FK_PCRel_2)
+     ImmOffset -= 2;
+@@ -1287,9 +1306,18 @@ encodeInstruction(const MCInst &MI, raw_ostream &OS,
+     EmitByte(BaseOpcode, CurByte, OS);
+     break;
+   }
+-  case X86II::RawFrm:
++  case X86II::RawFrm: {
+     EmitByte(BaseOpcode, CurByte, OS);
++
++    if (!is64BitMode(STI) || !isPCRel32Branch(MI))
++      break;
++
++    const MCOperand &Op = MI.getOperand(CurOp++);
++    EmitImmediate(Op, MI.getLoc(), X86II::getSizeOfImm(TSFlags),
++                  MCFixupKind(X86::reloc_branch_4byte_pcrel), CurByte, OS,
++                  Fixups);
+     break;
++  }
+   case X86II::RawFrmMemOffs:
+     // Emit segment override opcode prefix as needed.
+     EmitSegmentOverridePrefix(CurByte, 1, MI, OS);
+diff --git a/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp b/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
+index 965f7de809b..22773e64409 100644
+--- a/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
++++ b/lib/Target/X86/MCTargetDesc/X86MachObjectWriter.cpp
+@@ -94,6 +94,7 @@ static unsigned getFixupKindLog2Size(unsigned Kind) {
+   case X86::reloc_riprel_4byte_movq_load:
+   case X86::reloc_signed_4byte:
+   case X86::reloc_signed_4byte_relax:
++  case X86::reloc_branch_4byte_pcrel:
+   case FK_Data_4: return 2;
+   case FK_Data_8: return 3;
+   }
+diff --git a/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp b/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
+index 5139bb46b56..291056e3526 100644
+--- a/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
++++ b/lib/Target/X86/MCTargetDesc/X86WinCOFFObjectWriter.cpp
+@@ -62,6 +62,7 @@ unsigned X86WinCOFFObjectWriter::getRelocType(MCContext &Ctx,
+     case X86::reloc_riprel_4byte_movq_load:
+     case X86::reloc_riprel_4byte_relax:
+     case X86::reloc_riprel_4byte_relax_rex:
++    case X86::reloc_branch_4byte_pcrel:
+       return COFF::IMAGE_REL_AMD64_REL32;
+     case FK_Data_4:
+     case X86::reloc_signed_4byte:
+diff --git a/test/CodeGen/X86/cmp.ll b/test/CodeGen/X86/cmp.ll
+index 1ab8421638d..244e651e182 100644
+--- a/test/CodeGen/X86/cmp.ll
++++ b/test/CodeGen/X86/cmp.ll
+@@ -240,7 +240,7 @@ define i32 @test12() ssp uwtable {
+ ; CHECK-NEXT:    pushq %rax # encoding: [0x50]
+ ; CHECK-NEXT:    .cfi_def_cfa_offset 16
+ ; CHECK-NEXT:    callq test12b # encoding: [0xe8,A,A,A,A]
+-; CHECK-NEXT:    # fixup A - offset: 1, value: test12b-4, kind: FK_PCRel_4
++; CHECK-NEXT:    # fixup A - offset: 1, value: test12b-4, kind: reloc_branch_4byte_pcrel
+ ; CHECK-NEXT:    testb %al, %al # encoding: [0x84,0xc0]
+ ; CHECK-NEXT:    je .LBB12_2 # encoding: [0x74,A]
+ ; CHECK-NEXT:    # fixup A - offset: 1, value: .LBB12_2-1, kind: FK_PCRel_1
+diff --git a/test/CodeGen/X86/fma.ll b/test/CodeGen/X86/fma.ll
+index 611f707d64c..2c919e3ebc9 100644
+--- a/test/CodeGen/X86/fma.ll
++++ b/test/CodeGen/X86/fma.ll
+@@ -137,7 +137,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
+ ; FMA64-NEXT:    fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
+ ; FMA64-NEXT:    fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
+ ; FMA64-NEXT:    callq _fmal ## encoding: [0xe8,A,A,A,A]
+-; FMA64-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
++; FMA64-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
+ ; FMA64-NEXT:    addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
+ ; FMA64-NEXT:    retq ## encoding: [0xc3]
+ ;
+@@ -151,7 +151,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
+ ; FMACALL64-NEXT:    fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
+ ; FMACALL64-NEXT:    fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
+ ; FMACALL64-NEXT:    callq _fmal ## encoding: [0xe8,A,A,A,A]
+-; FMACALL64-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
++; FMACALL64-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
+ ; FMACALL64-NEXT:    addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
+ ; FMACALL64-NEXT:    retq ## encoding: [0xc3]
+ ;
+@@ -165,7 +165,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
+ ; AVX512-NEXT:    fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
+ ; AVX512-NEXT:    fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
+ ; AVX512-NEXT:    callq _fmal ## encoding: [0xe8,A,A,A,A]
+-; AVX512-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
++; AVX512-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
+ ; AVX512-NEXT:    addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
+ ; AVX512-NEXT:    retq ## encoding: [0xc3]
+ ;
+@@ -179,7 +179,7 @@ define x86_fp80 @test_f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c) #0 {
+ ; AVX512VL-NEXT:    fstpt {{[0-9]+}}(%rsp) ## encoding: [0xdb,0x7c,0x24,0x10]
+ ; AVX512VL-NEXT:    fstpt (%rsp) ## encoding: [0xdb,0x3c,0x24]
+ ; AVX512VL-NEXT:    callq _fmal ## encoding: [0xe8,A,A,A,A]
+-; AVX512VL-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: FK_PCRel_4
++; AVX512VL-NEXT:    ## fixup A - offset: 1, value: _fmal-4, kind: reloc_branch_4byte_pcrel
+ ; AVX512VL-NEXT:    addq $56, %rsp ## encoding: [0x48,0x83,0xc4,0x38]
+ ; AVX512VL-NEXT:    retq ## encoding: [0xc3]
+ entry:
+diff --git a/test/MC/ELF/basic-elf-64.s b/test/MC/ELF/basic-elf-64.s
+index 01f020bd64b..ae0903ec8cd 100644
+--- a/test/MC/ELF/basic-elf-64.s
++++ b/test/MC/ELF/basic-elf-64.s
+@@ -13,6 +13,7 @@ main:                                   # @main
+ 	callq	puts
+ 	xorl	%eax, %eax
+ 	addq	$8, %rsp
++    call foo@GOTPCREL
+ 	ret
+ .Ltmp0:
+ 	.size	main, .Ltmp0-main
+@@ -44,14 +45,15 @@ main:                                   # @main
+ 
+ // CHECK:     Name: .rela.text
+ 
+-// CHECK: Relocations [
+-// CHECK:   Section {{.*}} .rela.text {
+-// CHECK:     0x5  R_X86_64_32   .rodata.str1.1 0x0
+-// CHECK:     0xA  R_X86_64_PC32 puts           0xFFFFFFFFFFFFFFFC
+-// CHECK:     0xF  R_X86_64_32   .rodata.str1.1 0x6
+-// CHECK:     0x14 R_X86_64_PC32 puts           0xFFFFFFFFFFFFFFFC
+-// CHECK:   }
+-// CHECK: ]
++// CHECK:      Relocations [
++// CHECK:        Section {{.*}} .rela.text {
++// CHECK-NEXT:     0x5  R_X86_64_32   .rodata.str1.1 0x0
++// CHECK-NEXT:     0xA  R_X86_64_PLT32 puts           0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:     0xF  R_X86_64_32   .rodata.str1.1 0x6
++// CHECK-NEXT:     0x14 R_X86_64_PLT32 puts           0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:     0x1F R_X86_64_GOTPCREL foo 0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:   }
++// CHECK-NEXT: ]
+ 
+ // CHECK:   Symbol {
+ // CHECK:     Binding: Local
+diff --git a/test/MC/ELF/ifunc-reloc.s b/test/MC/ELF/ifunc-reloc.s
+index 6f1d79b22c4..b4917371b0f 100644
+--- a/test/MC/ELF/ifunc-reloc.s
++++ b/test/MC/ELF/ifunc-reloc.s
+@@ -11,6 +11,6 @@ alias:
+ 
+ // CHECK: Relocations [
+ // CHECK-NEXT:   Section {{.*}} .rela.text {
+-// CHECK-NEXT:     0x1 R_X86_64_PC32 sym 0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:     0x1 R_X86_64_PLT32 sym 0xFFFFFFFFFFFFFFFC
+ // CHECK-NEXT:   }
+ // CHECK-NEXT: ]
+diff --git a/test/MC/ELF/weak-diff.s b/test/MC/ELF/weak-diff.s
+index ded89b8f833..9785a2befb1 100644
+--- a/test/MC/ELF/weak-diff.s
++++ b/test/MC/ELF/weak-diff.s
+@@ -2,7 +2,7 @@
+ 
+ // CHECK:      Relocations [
+ // CHECK-NEXT:   Section ({{.*}}) .rela.text {
+-// CHECK-NEXT:     0x1D R_X86_64_PC32 f2 0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:     0x1D R_X86_64_PLT32 f2 0xFFFFFFFFFFFFFFFC
+ // CHECK-NEXT:   }
+ // CHECK-NEXT: ]
+ 
+diff --git a/test/MC/ELF/weak-relocation.s b/test/MC/ELF/weak-relocation.s
+index 19153aa50da..defaf4e6a38 100644
+--- a/test/MC/ELF/weak-relocation.s
++++ b/test/MC/ELF/weak-relocation.s
+@@ -9,6 +9,6 @@ bar:
+ 
+ // CHECK:      Relocations [
+ // CHECK-NEXT:   Section ({{[0-9]+}}) .rela.text {
+-// CHECK-NEXT:     0x1 R_X86_64_PC32 foo 0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:     0x1 R_X86_64_PLT32 foo 0xFFFFFFFFFFFFFFFC
+ // CHECK-NEXT:   }
+ // CHECK-NEXT: ]
+diff --git a/test/MC/ELF/weakref-reloc.s b/test/MC/ELF/weakref-reloc.s
+index baf80060c43..997aea0477a 100644
+--- a/test/MC/ELF/weakref-reloc.s
++++ b/test/MC/ELF/weakref-reloc.s
+@@ -9,6 +9,6 @@
+ // CHECK:      Relocations [
+ // CHECK-NEXT:   Section ({{[0-9]+}}) {{[^ ]+}} {
+ // CHECK-NEXT:     0x1 R_X86_64_PLT32 zed 0xFFFFFFFFFFFFFFFC
+-// CHECK-NEXT:     0x6 R_X86_64_PC32 foo 0xFFFFFFFFFFFFFFFC
++// CHECK-NEXT:     0x6 R_X86_64_PLT32 foo 0xFFFFFFFFFFFFFFFC
+ // CHECK-NEXT:   }
+ // CHECK-NEXT: ]
+-- 
+2.18.0
+
diff --git a/sys-devel/llvm/llvm-6.0.1-r1.ebuild b/sys-devel/llvm/llvm-6.0.1-r1.ebuild
new file mode 100644
index 000000000000..1d5d5a04df1d
--- /dev/null
+++ b/sys-devel/llvm/llvm-6.0.1-r1.ebuild
@@ -0,0 +1,266 @@
+# Copyright 1999-2018 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+
+: ${CMAKE_MAKEFILE_GENERATOR:=ninja}
+# (needed due to CMAKE_BUILD_TYPE != Gentoo)
+CMAKE_MIN_VERSION=3.7.0-r1
+PYTHON_COMPAT=( python2_7 )
+
+inherit cmake-utils eapi7-ver flag-o-matic multilib-minimal \
+	multiprocessing pax-utils python-any-r1 toolchain-funcs
+
+DESCRIPTION="Low Level Virtual Machine"
+HOMEPAGE="https://llvm.org/"
+SRC_URI="https://releases.llvm.org/${PV/_//}/${P/_/}.src.tar.xz
+	!doc? ( https://dev.gentoo.org/~mgorny/dist/llvm/${P}-manpages.tar.bz2 )"
+
+# Keep in sync with CMakeLists.txt
+ALL_LLVM_TARGETS=( AArch64 AMDGPU ARM BPF Hexagon Lanai Mips MSP430
+	NVPTX PowerPC Sparc SystemZ X86 XCore )
+ALL_LLVM_TARGETS=( "${ALL_LLVM_TARGETS[@]/#/llvm_targets_}" )
+
+# Additional licenses:
+# 1. OpenBSD regex: Henry Spencer's license ('rc' in Gentoo) + BSD.
+# 2. ARM backend: LLVM Software Grant by ARM.
+# 3. MD5 code: public-domain.
+# 4. Tests (not installed):
+#  a. gtest: BSD.
+#  b. YAML tests: MIT.
+
+LICENSE="UoI-NCSA rc BSD public-domain
+	llvm_targets_ARM? ( LLVM-Grant )"
+SLOT="$(ver_cut 1)"
+KEYWORDS="~amd64 ~arm ~arm64 ~ppc64 ~x86 ~amd64-fbsd ~amd64-linux ~ppc-macos ~x64-macos ~x86-macos"
+IUSE="debug doc gold libedit +libffi ncurses test xar xml
+	kernel_Darwin ${ALL_LLVM_TARGETS[*]}"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	sys-libs/zlib:0=
+	gold? ( >=sys-devel/binutils-2.22:*[cxx] )
+	libedit? ( dev-libs/libedit:0=[${MULTILIB_USEDEP}] )
+	libffi? ( >=virtual/libffi-3.0.13-r1:0=[${MULTILIB_USEDEP}] )
+	ncurses? ( >=sys-libs/ncurses-5.9-r3:0=[${MULTILIB_USEDEP}] )
+	xar? ( app-arch/xar )
+	xml? ( dev-libs/libxml2:2=[${MULTILIB_USEDEP}] )"
+# configparser-3.2 breaks the build (3.3 or none at all are fine)
+DEPEND="${RDEPEND}
+	dev-lang/perl
+	|| ( >=sys-devel/gcc-3.0 >=sys-devel/llvm-3.5
+		( >=sys-freebsd/freebsd-lib-9.1-r10 sys-libs/libcxx )
+	)
+	kernel_Darwin? (
+		<sys-libs/libcxx-$(ver_cut 1-3).9999
+		>=sys-devel/binutils-apple-5.1
+	)
+	doc? ( dev-python/sphinx )
+	gold? ( sys-libs/binutils-libs )
+	libffi? ( virtual/pkgconfig )
+	!!<dev-python/configparser-3.3.0.2
+	${PYTHON_DEPS}"
+# There are no file collisions between these versions but having :0
+# installed means llvm-config there will take precedence.
+RDEPEND="${RDEPEND}
+	!sys-devel/llvm:0"
+PDEPEND="sys-devel/llvm-common
+	gold? ( >=sys-devel/llvmgold-${SLOT} )"
+
+REQUIRED_USE="${PYTHON_REQUIRED_USE}
+	|| ( ${ALL_LLVM_TARGETS[*]} )"
+
+S=${WORKDIR}/${P/_/}.src
+
+# least intrusive of all
+CMAKE_BUILD_TYPE=RelWithDebInfo
+
+src_prepare() {
+	# Fix llvm-config for shared linking and sane flags
+	# https://bugs.gentoo.org/show_bug.cgi?id=565358
+	eapply "${FILESDIR}"/9999/0007-llvm-config-Clean-up-exported-values-update-for-shar.patch
+
+	# Fix appending -Wl,-rpath-link on non-Linux (-> FreeBSD).
+	eapply "${FILESDIR}"/6.0.1/0001-cmake-Append-Wl-rpath-link-conditionally-to-GNULD.patch
+
+	# Fix assembly compatibility with binutils-2.31.1
+	# https://bugs.gentoo.org/663442
+	eapply "${FILESDIR}"/6.0.1/0002-llvm-mc-Produce-R_X86_64_PLT32-for-call-jmp-foo.patch
+
+	# disable use of SDK on OSX, bug #568758
+	sed -i -e 's/xcrun/false/' utils/lit/lit/util.py || die
+
+	# User patches + QA
+	cmake-utils_src_prepare
+}
+
+multilib_src_configure() {
+	local ffi_cflags ffi_ldflags
+	if use libffi; then
+		ffi_cflags=$($(tc-getPKG_CONFIG) --cflags-only-I libffi)
+		ffi_ldflags=$($(tc-getPKG_CONFIG) --libs-only-L libffi)
+	fi
+
+	local libdir=$(get_libdir)
+	local mycmakeargs=(
+		# disable appending VCS revision to the version to improve
+		# direct cache hit ratio
+		-DLLVM_APPEND_VC_REV=OFF
+		-DCMAKE_INSTALL_PREFIX="${EPREFIX}/usr/lib/llvm/${SLOT}"
+		-DLLVM_LIBDIR_SUFFIX=${libdir#lib}
+
+		-DBUILD_SHARED_LIBS=ON
+		-DLLVM_TARGETS_TO_BUILD="${LLVM_TARGETS// /;}"
+		-DLLVM_BUILD_TESTS=$(usex test)
+
+		-DLLVM_ENABLE_FFI=$(usex libffi)
+		-DLLVM_ENABLE_LIBEDIT=$(usex libedit)
+		-DLLVM_ENABLE_TERMINFO=$(usex ncurses)
+		-DLLVM_ENABLE_LIBXML2=$(usex xml)
+		-DLLVM_ENABLE_ASSERTIONS=$(usex debug)
+		-DLLVM_ENABLE_EH=ON
+		-DLLVM_ENABLE_RTTI=ON
+
+		-DWITH_POLLY=OFF # TODO
+
+		-DLLVM_HOST_TRIPLE="${CHOST}"
+
+		-DFFI_INCLUDE_DIR="${ffi_cflags#-I}"
+		-DFFI_LIBRARY_DIR="${ffi_ldflags#-L}"
+		# used only for llvm-objdump tool
+		-DHAVE_LIBXAR=$(multilib_native_usex xar 1 0)
+
+		# disable OCaml bindings (now in dev-ml/llvm-ocaml)
+		-DOCAMLFIND=NO
+	)
+
+#	Note: go bindings have no CMake rules at the moment
+#	but let's kill the check in case they are introduced
+#	if ! multilib_is_native_abi || ! use go; then
+		mycmakeargs+=(
+			-DGO_EXECUTABLE=GO_EXECUTABLE-NOTFOUND
+		)
+#	fi
+
+	use test && mycmakeargs+=(
+		-DLLVM_LIT_ARGS="-vv;-j;${LIT_JOBS:-$(makeopts_jobs "${MAKEOPTS}" "$(get_nproc)")}"
+	)
+
+	if multilib_is_native_abi; then
+		mycmakeargs+=(
+			-DLLVM_BUILD_DOCS=$(usex doc)
+			-DLLVM_ENABLE_OCAMLDOC=OFF
+			-DLLVM_ENABLE_SPHINX=$(usex doc)
+			-DLLVM_ENABLE_DOXYGEN=OFF
+			-DLLVM_INSTALL_UTILS=ON
+		)
+		use doc && mycmakeargs+=(
+			-DCMAKE_INSTALL_MANDIR="${EPREFIX}/usr/lib/llvm/${SLOT}/share/man"
+			-DLLVM_INSTALL_SPHINX_HTML_DIR="${EPREFIX}/usr/share/doc/${PF}/html"
+			-DSPHINX_WARNINGS_AS_ERRORS=OFF
+		)
+		use gold && mycmakeargs+=(
+			-DLLVM_BINUTILS_INCDIR="${EPREFIX}"/usr/include
+		)
+	fi
+
+	if tc-is-cross-compiler; then
+		local tblgen="${EPREFIX}/usr/lib/llvm/${SLOT}/bin/llvm-tblgen"
+		[[ -x "${tblgen}" ]] \
+			|| die "${tblgen} not found or usable"
+		mycmakeargs+=(
+			-DCMAKE_CROSSCOMPILING=ON
+			-DLLVM_TABLEGEN="${tblgen}"
+		)
+	fi
+
+	# workaround BMI bug in gcc-7 (fixed in 7.4)
+	# https://bugs.gentoo.org/649880
+	# apply only to x86, https://bugs.gentoo.org/650506
+	if tc-is-gcc && [[ ${MULTILIB_ABI_FLAG} == abi_x86* ]] &&
+			[[ $(gcc-major-version) -eq 7 && $(gcc-minor-version) -lt 4 ]]
+	then
+		local CFLAGS="${CFLAGS} -mno-bmi"
+		local CXXFLAGS="${CXXFLAGS} -mno-bmi"
+	fi
+
+	# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
+	use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
+	cmake-utils_src_configure
+}
+
+multilib_src_compile() {
+	cmake-utils_src_compile
+
+	pax-mark m "${BUILD_DIR}"/bin/llvm-rtdyld
+	pax-mark m "${BUILD_DIR}"/bin/lli
+	pax-mark m "${BUILD_DIR}"/bin/lli-child-target
+
+	if use test; then
+		pax-mark m "${BUILD_DIR}"/unittests/ExecutionEngine/Orc/OrcJITTests
+		pax-mark m "${BUILD_DIR}"/unittests/ExecutionEngine/MCJIT/MCJITTests
+		pax-mark m "${BUILD_DIR}"/unittests/Support/SupportTests
+	fi
+}
+
+multilib_src_test() {
+	# respect TMPDIR!
+	local -x LIT_PRESERVES_TMP=1
+	cmake-utils_src_make check
+}
+
+src_install() {
+	local MULTILIB_CHOST_TOOLS=(
+		/usr/lib/llvm/${SLOT}/bin/llvm-config
+	)
+
+	local MULTILIB_WRAPPED_HEADERS=(
+		/usr/include/llvm/Config/llvm-config.h
+	)
+
+	local LLVM_LDPATHS=()
+	multilib-minimal_src_install
+
+	# move wrapped headers back
+	mv "${ED%/}"/usr/include "${ED%/}"/usr/lib/llvm/${SLOT}/include || die
+}
+
+multilib_src_install() {
+	cmake-utils_src_install
+
+	# move headers to /usr/include for wrapping
+	rm -rf "${ED%/}"/usr/include || die
+	mv "${ED%/}"/usr/lib/llvm/${SLOT}/include "${ED%/}"/usr/include || die
+
+	LLVM_LDPATHS+=( "${EPREFIX}/usr/lib/llvm/${SLOT}/$(get_libdir)" )
+}
+
+multilib_src_install_all() {
+	local revord=$(( 9999 - ${SLOT} ))
+	cat <<-_EOF_ > "${T}/10llvm-${revord}" || die
+		PATH="${EPREFIX}/usr/lib/llvm/${SLOT}/bin"
+		# we need to duplicate it in ROOTPATH for Portage to respect...
+		ROOTPATH="${EPREFIX}/usr/lib/llvm/${SLOT}/bin"
+		MANPATH="${EPREFIX}/usr/lib/llvm/${SLOT}/share/man"
+		LDPATH="$( IFS=:; echo "${LLVM_LDPATHS[*]}" )"
+_EOF_
+	doenvd "${T}/10llvm-${revord}"
+
+	# install pre-generated manpages
+	if ! use doc; then
+		# (doman does not support custom paths)
+		insinto "/usr/lib/llvm/${SLOT}/share/man/man1"
+		doins "${WORKDIR}/${P}-manpages/llvm"/*.1
+	fi
+
+	docompress "/usr/lib/llvm/${SLOT}/share/man"
+}
+
+pkg_postinst() {
+	elog "You can find additional opt-viewer utility scripts in:"
+	elog "  ${EROOT}/usr/lib/llvm/${SLOT}/share/opt-viewer"
+	elog "To use these scripts, you will need Python 2.7 along with the following"
+	elog "packages:"
+	elog "  dev-python/pygments (for opt-viewer)"
+	elog "  dev-python/pyyaml (for all of them)"
+}