[PATCH v5 0/4] Introduce CLANG38 toolchain in edk2

["Shi, Steven" <steven.shi@intel.com>]

Please review my new commits in public branch:
https://github.com/shijunjing/edk2/commits/llvm_v5

The difference from V4(https://github.com/shijunjing/edk2/commits/llvm_v4):
1. Remove the GCC5 path prefix for binutils objcopy, because a clang user may not set GCC5_BIN.
2. Follow GCC5 to disable the LTO for ASLCC flags.
3. Add CLANG38 in the "Supported Tool Chains" part.

The difference from V2(https://github.com/shijunjing/edk2/commits/llvm_v2):
1. Seperate the CLANG38 from the other two toolchains (GCC5, CLANGSCAN38), and only focus on CLANG38 in this serial.
2. Base on current GCC5 in edk2 to enhance the CLANG38.
3. Seperate the GenFW new relocation types support patch from this serial, and I will send it later in new serial.
4. Add EFIAPI for UefiShellCommandLib function.

Test pass platforms: OVMF (OvmfPkgIa32.dsc, OvmfPkgX64.dsc and
OvmfPkgIa32X64.dsc).
Test compiler and linker version: LLVM 3.8, GNU ld 2.26.

Example steps to use the CLANG38 tool chain to build OVMF platform:
1. Download and extract the llvm 3.8.0 Pre-Built Binaries from http://www.llvm.org/releases/ (e.g. http://www.llvm.org/releases/3.8.0/clang+llvm-3.8.0-x86_64-linux-gnu-ubuntu-16.04.tar.xz and extract it as ~/clang38).
2. Copy LLVMgold.so from https://github.com/shijunjing/edk2/blob/llvm/BaseTools/Bin/LLVMgold.so to above clang lib folder (e.g.~/clang38/lib/LLVMgold.so)
3. Install new version linker with plugin support (e.g. ld 2.26 in GNU Binutils 2.26 or Ubuntu16.04)
$ cd edk2
$ export CLANG38_BIN=path/to/your/clang38/ (e.g. export CLANG38_BIN=~/clang38/bin/)
$ source edksetup.sh
$ make -C BaseTools/Source/C
$ build -t CLANG38 -a X64 -p OvmfPkg/OvmfPkgX64.dsc -n 5 -b DEBUG -DDEBUG_ON_SERIAL_PORT
$ cd edk2/Build/OvmfX64/DEBUG_CLANG38/FV
$ qemu-system-x86_64.exe -bios OVMF.fd -serial file:serial.log -m 4096 -hda fat:.


Shi, Steven (4):
  BaseTools-Conf:Remove short dash in ar flag for LLVM
  BaseTools-Conf:Introduce CLANG38 new toolchain for x86
  ShellPkg-UefiShellTftpCommandLib: Replace compiler builtin
  ShellPkg-UefiShellCommandLib: Add EFIAPI in VA_List library function

 BaseTools/Conf/build_rule.template                 |  2 +-
 BaseTools/Conf/tools_def.template                  | 87 ++++++++++++++++++++++
 .../Library/UefiShellCommandLib/ConsistMapping.c   |  1 +
 ShellPkg/Library/UefiShellTftpCommandLib/Tftp.c    |  2 +-
 4 files changed, 90 insertions(+), 2 deletions(-)
 mode change 100644 => 100755 BaseTools/Conf/build_rule.template
 mode change 100644 => 100755 BaseTools/Conf/tools_def.template
 mode change 100644 => 100755 ShellPkg/Library/UefiShellCommandLib/ConsistMapping.c
 mode change 100644 => 100755 ShellPkg/Library/UefiShellTftpCommandLib/Tftp.c

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2.7.4