Toolchain: Build Clang with RISC-V support

Author: https://github.com/kleinesfilmroellchen
Commit: https://github.com/SerenityOS/serenity/commit/0b91d36a1e
Pull-request: https://github.com/SerenityOS/serenity/pull/20482
Reviewed-by: https://github.com/BertalanD ✅

Toolchain/BuildClang.sh

@@ -15,7 +15,7 @@ echo "$DIR"
 PREFIX="$DIR/Local/clang/"
 BUILD="$DIR/../Build/"
 USERLAND_ARCHS="x86_64"
-ARCHS="$USERLAND_ARCHS aarch64"
+ARCHS="$USERLAND_ARCHS aarch64 riscv64"
 
 MD5SUM="md5sum"
 REALPATH="realpath"
@@ -296,6 +296,7 @@ pushd "$DIR/Build/clang"
             -G Ninja \
             -DSERENITY_x86_64-pc-serenity_SYSROOT="$BUILD/x86_64clang/Root" \
             -DSERENITY_aarch64-pc-serenity_SYSROOT="$BUILD/aarch64clang/Root" \
+            -DSERENITY_riscv64-pc-serenity_SYSROOT="$BUILD/riscv64clang/Root" \
             -DCMAKE_INSTALL_PREFIX="$PREFIX" \
             -DSERENITY_MODULE_PATH="$DIR/CMake" \
             -C "$DIR/CMake/LLVMConfig.cmake" \

Toolchain/CMake/LLVMConfig.cmake

@@ -6,7 +6,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${SERENITY_MODULE_PATH}" CACHE STRIN
 
 set(CMAKE_BUILD_TYPE Release CACHE STRING "")
 
-set(LLVM_TARGETS_TO_BUILD "X86;AArch64" CACHE STRING "")
+set(LLVM_TARGETS_TO_BUILD "X86;AArch64;RISCV" CACHE STRING "")
 
 set(LLVM_ENABLE_PROJECTS "llvm;clang;lld;clang-tools-extra" CACHE STRING "")
 set(LLVM_ENABLE_RUNTIMES "compiler-rt" CACHE STRING "")
@@ -25,7 +25,7 @@ set(LLVM_INSTALL_BINUTILS_SYMLINKS OFF CACHE BOOL "")
 set(CLANG_ENABLE_CLANGD OFF CACHE BOOL "")
 
 set(compiler_flags "-nostdlib -nostdlib++")
-foreach(target x86_64-pc-serenity;aarch64-pc-serenity)
+foreach(target x86_64-pc-serenity;aarch64-pc-serenity;riscv64-pc-serenity)
     list(APPEND targets "${target}")
 
     set(RUNTIMES_${target}_CMAKE_BUILD_TYPE Release CACHE STRING "")

Toolchain/Patches/llvm/0003-Driver-Add-support-for-SerenityOS.patch

@@ -2,25 +2,30 @@ From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Daniel Bertalan <dani@danielbertalan.dev>
 Date: Thu, 14 Apr 2022 10:09:50 +0200
 Subject: [PATCH] [Driver] Add support for SerenityOS
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
 
 Adds support for the `$arch-pc-serenity` target to the Clang front end.
 This makes the compiler look for libraries and headers in the right
 places, and enables some security mitigations like stack-smashing
 protection and position-independent code by default.
+
+Co-authored-by: kleines Filmröllchen <filmroellchen@serenityos.org>
 ---
- clang/lib/Basic/Targets.cpp              |   6 +
+ clang/lib/Basic/Targets.cpp              |   8 +
  clang/lib/Basic/Targets/OSTargets.h      |  18 ++
  clang/lib/Driver/CMakeLists.txt          |   1 +
  clang/lib/Driver/Driver.cpp              |   4 +
  clang/lib/Driver/ToolChain.cpp           |   2 +
  clang/lib/Driver/ToolChains/Serenity.cpp | 336 +++++++++++++++++++++++
  clang/lib/Driver/ToolChains/Serenity.h   | 100 +++++++
- 7 files changed, 467 insertions(+)
+ 7 files changed, 469 insertions(+)
  create mode 100644 clang/lib/Driver/ToolChains/Serenity.cpp
  create mode 100644 clang/lib/Driver/ToolChains/Serenity.h
 
 diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
-index 8400774db..f105bed29 100644
+index 8400774db..f82618dc8 100644
 --- a/clang/lib/Basic/Targets.cpp
 +++ b/clang/lib/Basic/Targets.cpp
 @@ -153,6 +153,8 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
@@ -32,7 +37,16 @@ index 8400774db..f105bed29 100644
      case llvm::Triple::Win32:
        switch (Triple.getEnvironment()) {
        case llvm::Triple::GNU:
-@@ -542,6 +544,8 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
+@@ -424,6 +426,8 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
+       return new FuchsiaTargetInfo<RISCV64TargetInfo>(Triple, Opts);
+     case llvm::Triple::Linux:
+       return new LinuxTargetInfo<RISCV64TargetInfo>(Triple, Opts);
++    case llvm::Triple::Serenity:
++      return new SerenityTargetInfo<RISCV64TargetInfo>(Triple, Opts);
+     default:
+       return new RISCV64TargetInfo(Triple, Opts);
+     }
+@@ -542,6 +546,8 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
        return new MCUX86_32TargetInfo(Triple, Opts);
      case llvm::Triple::Hurd:
        return new HurdTargetInfo<X86_32TargetInfo>(Triple, Opts);
@@ -41,7 +55,7 @@ index 8400774db..f105bed29 100644
      default:
        return new X86_32TargetInfo(Triple, Opts);
      }
-@@ -596,6 +600,8 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
+@@ -596,6 +602,8 @@ TargetInfo *AllocateTarget(const llvm::Triple &Triple,
        return new PS4OSTargetInfo<X86_64TargetInfo>(Triple, Opts);
      case llvm::Triple::PS5:
        return new PS5OSTargetInfo<X86_64TargetInfo>(Triple, Opts);

Toolchain/Patches/llvm/0004-Driver-Default-to-ftls-model-initial-exec-on-Serenit.patch

@@ -1,8 +1,7 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Daniel Bertalan <dani@danielbertalan.dev>
 Date: Thu, 14 Apr 2022 10:12:54 +0200
-Subject: [PATCH] [Driver] Default to -ftls-model=initial-exec on
+Subject: [PATCH] [Driver] Default to -ftls-model=initial-exec on SerenityOS
- SerenityOS
 
 This is a hack to make Clang use the initial-exec TLS model instead of
 the default local-exec when building code for Serenity.
@@ -13,7 +12,7 @@ This patch should be removed when we implement proper TLS support.
  1 file changed, 7 insertions(+), 1 deletion(-)
 
 diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
-index ec6860113..c5c07e5ee 100644
+index 77554aa2c..84eebee36 100644
 --- a/clang/lib/Driver/ToolChains/Clang.cpp
 +++ b/clang/lib/Driver/ToolChains/Clang.cpp
 @@ -6100,7 +6100,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,

Toolchain/Patches/llvm/0005-libc-Add-support-for-SerenityOS.patch

@@ -36,7 +36,7 @@ index a12aa1de1..075ebbe81 100644
    __support/solaris/wchar.h
    __support/solaris/xlocale.h
 diff --git a/libcxx/include/__config b/libcxx/include/__config
-index 5e30a4217..5dea34814 100644
+index 108153883..e4434809c 100644
 --- a/libcxx/include/__config
 +++ b/libcxx/include/__config
 @@ -930,7 +930,8 @@ _LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD

Toolchain/Patches/llvm/0008-cmake-Support-building-shared-libLLVM-and-libClang-f.patch

@@ -1,8 +1,8 @@
 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
 From: Daniel Bertalan <dani@danielbertalan.dev>
 Date: Mon, 18 Apr 2022 22:32:29 +0200
-Subject: [PATCH] [cmake] Support building shared libLLVM and libClang
+Subject: [PATCH] [cmake] Support building shared libLLVM and libClang for
- for SerenityOS
+ SerenityOS
 
 This patch tells CMake that the --whole-archive linker option should be
 used for specifying the archives whose members will constitute these