UDK2018 (UEFI Development Kit, 2018 release), released in March 2018, contains reasonably detailed instructions on how to build the UDK2018 release on a “Linux-like System” which in practical terms is actually Ubuntu 16.04 LTS, or Ubuntu 16.10, and GCC 5. In this post, I show you how to install and build UDK2018 on Fedora 29 – which was released on October 30th, 2018 – using the Clang 7.0 toolchain.
UDK2018 is simply a validated snapshot of a subset of the EDK II (EFI Development Kit, version 2) source code at a particular point in time. The previous validated snapshot of EDK II was UDK2017 which was released in June 2017. Henceforth in this post, I will use the term EDK2 instead of EDK II.
This post assumes that you have a modicum of understanding about EDK2, Fedora, and the Clang toolchain. I also assume that gcc, Python 2.7, git and make are already installed. If not, you will need to install the appropriate packages. You also need the GNU C++ compiler installed because one of the build tools, i.e. vfrcompiler, requires building with a C++ compiler. Amongst other things, the vrfcompiler tool converts VFRs (Virtual Forms Representation) into IFRs (Internal Forms Representation) which form part of a UEFI HII (Human Interface Infrastructure) database.
First, you need to obtain the UDK2018 sources. You can use git to get a copy of the UDK2018 sources as shown here:
$ cd ~ $ git clone https://github.com/tianocore/edk2.git vUDK2018 $ mv vUDK2018 UDK2018
or, alternatively, you can download a zipfile or a tarball of the source files from here.
In the rest of this post, I assume that UDK2018 is installed at ~/UDK2018. In my case, that is /home/fpm/UDK2018. For reasons unknown, the current online instructions for building UDK2018 on a “Linux-like System” specify the root as ~/src/MyWorkspace.
Next install all the necessary packages to build the UDK2018 build tools.
# dnf install gcc-c++ nasm libuuid-devel acpica-tools
You should now be able to build all the necessary EDK2-specific tools required to build applications in UDK2017.
$ cd ~/UDK2018/BaseTools $ make
For detailed information on all the EDK2 tools (and there are lots of them), refer to the EDK BaseTools User Guides. By the way, all EDK2 tools use INI style text based files to describe components, platforms and firmware volumes.
Assuming that the build tools have all been built successfully, the next step is to test and validate the build environment. Initialize the UDK2018 build environment using the edksetup.sh shell script.
$ cd ~/UDK2018 $ . ./edksetup.sh WORKSPACE: /home/fpm/UDK2018 EDK_TOOLS_PATH: /home/fpm/UDK2018/BaseTools CONF_PATH: /home/fpm/UDK2018/Conf $
Note difference when you initiate the build environment for the second time or subsequent times:
$ cd ~/UDK2018 $ . ./edksetup.sh Loading previous configuration from /home/fpm/UDK2018/Conf/BuildEnv.sh WORKSPACE: /home/fpm/UDK2018 EDK_TOOLS_PATH: /home/fpm/UDK2018/BaseTools CONF_PATH: /home/fpm/UDK2018/Conf
On Fedora 29, the default version of the GCC C compiler is 8.2.1. UDK2018 does not support GCC C compiler v8 out of the box. It only supports versions 4.4 through 5.0. However, it will still build modules (packages) and binaries using the default settings. Later on in this post, I will show you how to add Clang 7.0 support.
To test that your UDK2018 build environment is correct, enter following commands to build the supplied MdeModule package:
$ . ./edksetup.sh ... $ build -p MdeModulePkg/MdeModulePkg.dsc -t GCC5 Build environment: Linux-4.19.13-300.fc29.x86_64-x86_64-with-fedora-29-Twenty_Nine Build start time: 02:48:51, Jan.26 2019 WORKSPACE = /home/fpm/UDK2018 ECP_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EDK_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EFI_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EDK_TOOLS_PATH = /home/fpm/UDK2018/BaseTools CONF_PATH = /home/fpm/UDK2018/Conf Architecture(s) = IA32 Build target = DEBUG Toolchain = GCC5 Active Platform = /home/fpm/UDK2018/MdeModulePkg/MdeModulePkg.dsc Processing meta-data ....... done! Building ... /home/fpm/UDK2018/MdePkg/Library/UefiLib/UefiLib.inf [IA32] Building ... /home/fpm/UDK2018/MdePkg/Library/UefiApplicationEntryPoint/UefiApplicationEntryPoint.inf [IA32] "gcc" -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=UefiLibStrings -m32 -march=i586 -malign-double -fno-stack-protector -D EFI32 -fno-asynchronous-unwind-tables -Wno-address -fno-pic -fno-pie -flto -Os -D DISABLE_NEW_DEPRECATED_INTERFACES -c -o /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdePkg/Library/UefiLib/UefiLib/OUTPUT/./UefiLibPrint.obj -I/home/fpm/UDK2018/MdePkg/Library/UefiLib -I/home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdePkg/Library/UefiLib/UefiLib/DEBUG -I/home/fpm/UDK2018/MdePkg -I/home/fpm/UDK2018/MdePkg/Include -I/home/fpm/UDK2018/MdePkg/Include/Ia32 /home/fpm/UDK2018/MdePkg/Library/UefiLib/UefiLibPrint.c ... rm -f /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/OUTPUT/MemoryProfileInfo.lib "gcc-ar" cr gcc-ar" cr /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/OUTPUT/MemoryProfileInfo.lib @/home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/OUTPUT/object_files.lst "gcc" -o /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/DEBUG/MemoryProfileInfo.dll -nostdlib -Wl,-n,-q,--gc-sections -z common-page-size=0x40 -Wl,--entry,_ModuleEntryPoint -u _ModuleEntryPoint -Wl,-Map,/home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/DEBUG/MemoryProfileInfo.map,--whole-archive -flto -Os -Wl,-m,elf_i386,--oformat=elf32-i386 -Wl,--start-group,@/home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/OUTPUT/static_library_files.lst,--end-group -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=MemoryProfileInfoStrings -m32 -march=i586 -malign-double -fno-stack-protector -D EFI32 -fno-asynchronous-unwind-tables -Wno-address -fno-pic -fno-pie -flto -Os -D DISABLE_NEW_DEPRECATED_INTERFACES -Wl,--defsym=PECOFF_HEADER_SIZE=0x220 -Wl,--script=/home/fpm/UDK2018/BaseTools/Scripts/GccBase.lds -Wno-error -no-pie "objcopy" /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo/DEBUG/MemoryProfileInfo.dll ... cp -f /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe/DEBUG/PciHostBridgeDxe.efi /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe/OUTPUT cp -f /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe/DEBUG/PciHostBridgeDxe.efi /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/PciHostBridgeDxe.efi cp -f /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe/DEBUG/*.map /home/fpm/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe/OUTPUT - Done - Build total time: 00:01:53
If the build is successful, there should be a UEFI executable named “HelloWorld.efi” in the ~/UDK2018/Build/MdeModule/DEBUG_GCC5/IA32 directory.
Now that you have proved that your basic build environment is working by building a specific package, it is time to build your own UEFI application. Typically, you will want your own source code area within the UDK2018 directory framework for applications you develop. Let us call this area MyApps.
Create a new directory ~/UDK2018/MyApps and cd to that directory. Create a file named MyApps.dec containing the following text:
[Defines] DEC_SPECIFICATION = 0x00010005 PACKAGE_NAME = MyApps PACKAGE_GUID = B3E3D3D5-D62B-4497-A175-264F489D127E PACKAGE_VERSION = 0.01 [Guids] [PcdsFixedAtBuild]
The DEC (Declaration) file format was designed to support building packaging and distribution of EDK2 modules, as well as for building custom applications using the EDK2 build infrastructure. See the EDK II Package Declaration (DEC) File Format Specification for full details. It can be accessed from here.
Also, in the same subdirectory, create a file named MyApps.dsc containing the following text:
[Defines]
PLATFORM_NAME = MyApps
PLATFORM_GUID = 0458dade-8b6e-4e45-b773-1b27cbda3e06
PLATFORM_VERSION = 0.01
DSC_SPECIFICATION = 0x00010006
OUTPUT_DIRECTORY = Build/MyApps
SUPPORTED_ARCHITECTURES = IA32|X64|EBC
BUILD_TARGETS = DEBUG|RELEASE|NOOPT
SKUID_IDENTIFIER = DEFAULT
#
# Debug output control
#
DEFINE DEBUG_ENABLE_OUTPUT = FALSE # Set to TRUE to enable debug output
DEFINE DEBUG_PRINT_ERROR_LEVEL = 0x80000040 # Flags to control amount of debug output
DEFINE DEBUG_PROPERTY_MASK = 0
[PcdsFeatureFlag]
[PcdsFixedAtBuild]
gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask|$(DEBUG_PROPERTY_MASK)
gEfiMdePkgTokenSpaceGuid.PcdDebugPrintErrorLevel|$(DEBUG_PRINT_ERROR_LEVEL)
[PcdsFixedAtBuild.IPF]
[LibraryClasses]
# Entry Point Libraries
UefiApplicationEntryPoint|MdePkg/Library/UefiApplicationEntryPoint/UefiApplicationEntryPoint.inf
ShellCEntryLib|ShellPkg/Library/UefiShellCEntryLib/UefiShellCEntryLib.inf
UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf
# Common Libraries
BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
UefiLib|MdePkg/Library/UefiLib/UefiLib.inf
PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
UefiRuntimeServicesTableLib|MdePkg/Library/UefiRuntimeServicesTableLib/UefiRuntimeServicesTableLib.inf
!if $(DEBUG_ENABLE_OUTPUT)
DebugLib|MdePkg/Library/UefiDebugLibConOut/UefiDebugLibConOut.inf
DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
!else ## DEBUG_ENABLE_OUTPUT
DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
!endif ## DEBUG_ENABLE_OUTPUT
DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
PeCoffGetEntryPointLib|MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf
IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
PciLib|MdePkg/Library/BasePciLibCf8/BasePciLibCf8.inf
PciCf8Lib|MdePkg/Library/BasePciCf8Lib/BasePciCf8Lib.inf
SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
UefiRuntimeLib|MdePkg/Library/UefiRuntimeLib/UefiRuntimeLib.inf
HiiLib|MdeModulePkg/Library/UefiHiiLib/UefiHiiLib.inf
UefiHiiServicesLib|MdeModulePkg/Library/UefiHiiServicesLib/UefiHiiServicesLib.inf
PerformanceLib|MdeModulePkg/Library/DxePerformanceLib/DxePerformanceLib.inf
HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
FileHandleLib|MdePkg/Library/UefiFileHandleLib/UefiFileHandleLib.inf
SortLib|MdeModulePkg/Library/UefiSortLib/UefiSortLib.inf
ShellLib|ShellPkg/Library/UefiShellLib/UefiShellLib.inf
ShellCommandLib|ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.inf
HandleParsingLib|ShellPkg/Library/UefiHandleParsingLib/UefiHandleParsingLib.inf
CacheMaintenanceLib|MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
[Components]
#### Applications ####
MyApps/HelloWorld/HelloWorld.inf
A DSC file is an EDK2 platform description file that contains a list of:
- EDK2 Module INF Files
- EDK Components
- EDK libraries (used by EDK components)
- EDK2 Library class instance mappings (used by EDK2 modules)
- EDK2 PCD Entries
See the EDK II Platform Description (DSC) File Specification for full details. It can be accessed from here. The sample contents provided above contain most of the libraries that you should ever need. The only supported architecture in the above platform description file is X64; you can add additional architectures such as IA32 or AARCH64 if you want too.
Next, let us create a simple Hello World UEFI application. In our particular build environment, all the source files associated with our Hello World application are located in one directory and form a package. Go ahead an create a subdirectory under …/UDK2018/MyApps named HelloWorld.
In the HelloWorld subdirectory, create a file named HelloWorld.inf with the following contents:
Defines] INF_VERSION = 0x00010006 BASE_NAME = HelloWorld FILE_GUID = a912f198-7f0e-4803-b908-b757b806ec83 MODULE_TYPE = UEFI_APPLICATION VERSION_STRING = 1.0 ENTRY_POINT = ShellCEntryLib VALID_ARCHITECTURES = X64 [Sources] HelloWorld.c [Packages] MdePkg/MdePkg.dec ShellPkg/ShellPkg.dec [LibraryClasses] UefiLib ShellCEntryLib
An INF file is an EDK2 module information file. INF files are used by EDK2 build tools to generate AutoGen.c and AutoGen.h and Makefile/GNU makefile files for the EDK2 build infrastructure. The intent of a module’s INF file is to define the source files, libraries, and definitions relevant to building the module, creating one or more binary files that are either raw binary files or PE32 or PE32+ or COFF format files. See the EDK II Module Information (INF) File Specification for full details. It can be accessed from here.
Next, in the HelloWorld subdirectory, create a file named HelloWorld.c containing the following:
#include <uefi.h>
#include <Library/UefiLib.h>
#include <Library/ShellCEntryLib.h>
INTN
EFIAPI
ShellAppMain( UINTN Argc, CHAR16 **Argv)
{
Print(L"Hello World!\n");
return(0);
}
This is the actual source file for our HelloWorld UEFI application. Everything else we have done up to this point was related to the EDK2 build environment.
Now, we finally get to build out HelloWorld application:
$ cd ~/UDK2018 $ . ./edksetup.sh $ build -p MyApps/MyApps.dsc -t GCC5 -a X64 Build environment: Linux-4.19.13-300.fc29.x86_64-x86_64-with-fedora-29-Twenty_Nine Build start time: 09:34:19, Jan.26 2019 WORKSPACE = /home/fpm/UDK2018 ECP_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EDK_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EFI_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EDK_TOOLS_PATH = /home/fpm/UDK2018/BaseTools CONF_PATH = /home/fpm/UDK2018/Conf Architecture(s) = X64 Build target = DEBUG Toolchain = GCC5 Active Platform = /home/fpm/UDK2018/MyApps/MyApps.dsc Processing meta-data . done! ... Building ... /home/fpm/UDK2018/MyApps/HelloWorld/HelloWorld.inf [X64] "gcc" -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=HelloWorldStrings -m64 -fno-stack-protector "-DEFIAPI=__attribute__((ms_abi))" -maccumulate-outgoing-args -mno-red-zone -Wno-address -mcmodel=small -fpie -fno-asynchronous-unwind-tables -Wno-address -flto -DUSING_LTO -Os -c -o /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/./HelloWorld.obj -I/home/fpm/UDK2018/MyApps/HelloWorld -I/home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG -I/home/fpm/UDK2018/MdePkg -I/home/fpm/UDK2018/MdePkg/Include -I/home/fpm/UDK2018/MdePkg/Include/X64 -I/home/fpm/UDK2018/ShellPkg -I/home/fpm/UDK2018/ShellPkg/Include /home/fpm/UDK2018/MyApps/HelloWorld/HelloWorld.c rm -f /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/HelloWorld.lib "gcc-ar" cr /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/HelloWorld.lib @/home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/object_files.lst "gcc" -o /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll -nostdlib -Wl,-n,-q,--gc-sections -z common-page-size=0x40 -Wl,--entry,_ModuleEntryPoint -u _ModuleEntryPoint -Wl,-Map,/home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.map,--whole-archive -Wl,-melf_x86_64,--oformat=elf64-x86-64,-pie -flto -Os -Wl,--start-group,@/home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/static_library_files.lst,--end-group -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=HelloWorldStrings -m64 -fno-stack-protector "-DEFIAPI=__attribute__((ms_abi))" -maccumulate-outgoing-args -mno-red-zone -Wno-address -mcmodel=small -fpie -fno-asynchronous-unwind-tables -Wno-address -flto -DUSING_LTO -Os -Wl,--defsym=PECOFF_HEADER_SIZE=0x228 -Wl,--script=/home/fpm/UDK2018/BaseTools/Scripts/GccBase.lds -Wno-error "objcopy" /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll cp -f /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.debug objcopy --strip-unneeded -R .eh_frame /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll objcopy --add-gnu-debuglink=/home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.debug /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll cp -f /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.debug /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/HelloWorld.debug "GenFw" -e UEFI_APPLICATION -o /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.efi /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll cp -f /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.efi /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT cp -f /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.efi /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/HelloWorld.efi cp -f /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/DEBUG/*.map /home/fpm/UDK2018/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT - Done - Build total time: 00:00:02 $
Note how a HelloWorld.dll was first built, and genfw was then used to convert that DLL into HelloWorld.efi which is actually a simple MSDOS executable.
Turning now to adding Clang 7.0 support to the UDK2018 build environment. Only one file needs to be augmented, i.e. …/UDK2017/Conf/tools_def.txt. Here are the diffs for that file:
5475a5476,5537 > #################################################################################### > # > # Clang 7.0 - This configuration is used to compile under Linux to produce > # PE/COFF binaries using LLVM/Clang 7.0 with Link Time Optimization enabled > # > #################################################################################### > *_CLANG70_*_*_FAMILY = GCC > *_CLANG70_*_MAKE_PATH = make > *_CLANG70_*_*_DLL = ENV(CLANG70_DLL) > *_CLANG70_*_ASL_PATH = DEF(UNIX_IASL_BIN) > > *_CLANG70_*_APP_FLAGS = > *_CLANG70_*_ASL_FLAGS = DEF(IASL_FLAGS) > *_CLANG70_*_ASL_OUTFLAGS = DEF(IASL_OUTFLAGS) > > DEFINE CLANG70_X64_PREFIX = ENV(CLANG70_BIN) > > DEFINE CLANG70_X64_TARGET = -target x86_64-pc-linux-gnu > > DEFINE CLANG70_WARNING_OVERRIDES = -Wno-parentheses-equality -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare -Wno-empty-body -Wno-unused-const-variable -Wno-varargs -Wno-unknown-warning-option > DEFINE CLANG70_ALL_CC_FLAGS = DEF(GCC44_ALL_CC_FLAGS) DEF(CLANG38_WARNING_OVERRIDES) -fno-stack-protector -mms-bitfields -Wno-address -Wno-shift-negative-value -Wno-unknown-pragmas -Wno-incompatible-library-redeclaration -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -msoft-float -mno-implicit-float -ftrap-function=undefined_behavior_has_been_optimized_away_by_clang -funsigned-char -fno-ms-extensions -Wno-null-dereference > > > ########################## > # CLANG70 X64 definitions > ########################## > *_CLANG70_X64_OBJCOPY_PATH = objcopy > *_CLANG70_X64_CC_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_SLINK_PATH = DEF(CLANG70_X64_PREFIX)llvm-ar > *_CLANG70_X64_DLINK_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_ASLDLINK_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_ASM_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_PP_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_VFRPP_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_ASLCC_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_ASLPP_PATH = DEF(CLANG70_X64_PREFIX)clang > *_CLANG70_X64_RC_PATH = objcopy > > *_CLANG70_X64_ASLCC_FLAGS = DEF(GCC_ASLCC_FLAGS) -m64 -fno-lto DEF(CLANG70_X64_TARGET) > *_CLANG70_X64_ASLDLINK_FLAGS = DEF(GCC5_IA32_X64_ASLDLINK_FLAGS) -Wl,-m,elf_x86_64 > *_CLANG70_X64_ASM_FLAGS = DEF(GCC5_ASM_FLAGS) -m64 DEF(CLANG70_X64_TARGET) > *_CLANG70_X64_RC_FLAGS = DEF(GCC_X64_RC_FLAGS) > *_CLANG70_X64_OBJCOPY_FLAGS = > *_CLANG70_X64_NASM_FLAGS = -f elf64 > *_CLANG70_X64_PP_FLAGS = DEF(GCC_PP_FLAGS) DEF(CLANG70_X64_TARGET) > *_CLANG70_X64_ASLPP_FLAGS = DEF(GCC_ASLPP_FLAGS) DEF(CLANG70_X64_TARGET) > *_CLANG70_X64_VFRPP_FLAGS = DEF(GCC_VFRPP_FLAGS) DEF(CLANG70_X64_TARGET) > > DEBUG_CLANG70_X64_CC_FLAGS = DEF(CLANG70_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANG70_X64_TARGET) -g > DEBUG_CLANG70_X64_DLINK_FLAGS = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie -mcmodel=small > DEBUG_CLANG70_X64_DLINK2_FLAGS = DEF(GCC5_X64_DLINK2_FLAGS) -O3 > > RELEASE_CLANG70_X64_CC_FLAGS = DEF(CLANG70_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto DEF(CLANG70_X64_TARGET) > RELEASE_CLANG70_X64_DLINK_FLAGS = DEF(GCC5_IA32_X64_DLINK_FLAGS) -flto -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie -mcmodel=small > RELEASE_CLANG70_X64_DLINK2_FLAGS = DEF(GCC5_X64_DLINK2_FLAGS) -O3 > > NOOPT_CLANG70_X64_CC_FLAGS = DEF(CLANG70_ALL_CC_FLAGS) -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -O0 DEF(CLANG70_X64_TARGET) -g > NOOPT_CLANG70_X64_DLINK_FLAGS = DEF(GCC5_IA32_X64_DLINK_FLAGS) -Wl,-O0 -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie -mcmodel=small > NOOPT_CLANG70_X64_DLINK2_FLAGS = DEF(GCC5_X64_DLINK2_FLAGS) -O0 >
You can download the full updated tools_def.txt from here. The file is named UDK2018_CLANG70_tools_def.txt.
You can also set defaults for a number of the build options such the package to build, the target architecture, toolchain to use, and more. To do this, you need to modify …/UDK2018/Conf/target.txt. Here are the diffs for the modifications I made to my version of this file:
$ diff target.txt.org target.txt 26c26 < ACTIVE_PLATFORM = Nt32Pkg/Nt32Pkg.dsc --- > ACTIVE_PLATFORM = MyApps/MyApps.dsc 34c34 < TARGET = DEBUG --- > TARGET = RELEASE 50c50 < TARGET_ARCH = IA32 --- > TARGET_ARCH = X64 60c60 < TOOL_CHAIN_TAG = MYTOOLS --- > TOOL_CHAIN_TAG = CLANG70 69c69 < # MAX_CONCURRENT_THREAD_NUMBER = 1 --- > MAX_CONCURRENT_THREAD_NUMBER = 5 $
Here I build the HelloWorld application again but this time using the Clang 7.0 toolchain and build with no arguments:
$ build Build environment: Linux-4.19.13-300.fc29.x86_64-x86_64-with-fedora-29-Twenty_Nine Build start time: 02:32:08, Jan.26 2019 WORKSPACE = /home/fpm/UDK2018 ECP_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EDK_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EFI_SOURCE = /home/fpm/UDK2018/EdkCompatibilityPkg EDK_TOOLS_PATH = /home/fpm/UDK2018/BaseTools CONF_PATH = /home/fpm/UDK2018/Conf Architecture(s) = X64 Build target = RELEASE Toolchain = CLANG70 Active Platform = /home/fpm/UDK2018/MyApps/MyApps.dsc Processing meta-data . done! ... Building ... /home/fpm/UDK2018/MyApps/HelloWorld/HelloWorld.inf [X64] "clang" -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=HelloWorldStrings -Wno-parentheses-equality -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare -Wno-empty-body -Wno-unused-const-variable -Wno-varargs -Wno-unknown-warning-option -fno-stack-protector -mms-bitfields -Wno-address -Wno-shift-negative-value -Wno-unknown-pragmas -Wno-incompatible-library-redeclaration -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -msoft-float -mno-implicit-float -ftrap-function=undefined_behavior_has_been_optimized_away_by_clang -funsigned-char -fno-ms-extensions -Wno-null-dereference -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto -target x86_64-pc-linux-gnu -c -o /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/./HelloWorld.obj -I/home/fpm/UDK2018/MyApps/HelloWorld -I/home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG -I/home/fpm/UDK2018/MdePkg -I/home/fpm/UDK2018/MdePkg/Include -I/home/fpm/UDK2018/MdePkg/Include/X64 -I/home/fpm/UDK2018/ShellPkg -I/home/fpm/UDK2018/ShellPkg/Include /home/fpm/UDK2018/MyApps/HelloWorld/HelloWorld.c "clang" -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=HelloWorldStrings -Wno-parentheses-equality -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare -Wno-empty-body -Wno-unused-const-variable -Wno-varargs -Wno-unknown-warning-option -fno-stack-protector -mms-bitfields -Wno-address -Wno-shift-negative-value -Wno-unknown-pragmas -Wno-incompatible-library-redeclaration -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -msoft-float -mno-implicit-float -ftrap-function=undefined_behavior_has_been_optimized_away_by_clang -funsigned-char -fno-ms-extensions -Wno-null-dereference -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto -target x86_64-pc-linux-gnu -c -o /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/./AutoGen.obj -I/home/fpm/UDK2018/MyApps/HelloWorld -I/home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG -I/home/fpm/UDK2018/MdePkg -I/home/fpm/UDK2018/MdePkg/Include -I/home/fpm/UDK2018/MdePkg/Include/X64 -I/home/fpm/UDK2018/ShellPkg -I/home/fpm/UDK2018/ShellPkg/Include /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/AutoGen.c rm -f /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/HelloWorld.lib "llvm-ar" cr /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/HelloWorld.lib @/home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/object_files.lst "clang" -o /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll -nostdlib -Wl,-n,-q,--gc-sections -z common-page-size=0x40 -Wl,--entry,_ModuleEntryPoint -u _ModuleEntryPoint -Wl,-Map,/home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.map,--whole-archive -flto -Wl,-Oz -Wl,-melf_x86_64 -Wl,--oformat=elf64-x86-64 -Wl,-pie -mcmodel=small -Wl,--start-group,@/home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/static_library_files.lst,--end-group -g -fshort-wchar -fno-builtin -fno-strict-aliasing -Wall -Werror -Wno-array-bounds -ffunction-sections -fdata-sections -include AutoGen.h -fno-common -DSTRING_ARRAY_NAME=HelloWorldStrings -Wno-parentheses-equality -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare -Wno-empty-body -Wno-unused-const-variable -Wno-varargs -Wno-unknown-warning-option -fno-stack-protector -mms-bitfields -Wno-address -Wno-shift-negative-value -Wno-unknown-pragmas -Wno-incompatible-library-redeclaration -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -msoft-float -mno-implicit-float -ftrap-function=undefined_behavior_has_been_optimized_away_by_clang -funsigned-char -fno-ms-extensions -Wno-null-dereference -m64 "-DEFIAPI=__attribute__((ms_abi))" -mno-red-zone -mcmodel=small -fpie -Oz -flto -target x86_64-pc-linux-gnu -Wl,--defsym=PECOFF_HEADER_SIZE=0x228 -Wl,--script=/home/fpm/UDK2018/BaseTools/Scripts/GccBase.lds -Wno-error -O3 "objcopy" /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll cp -f /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.debug objcopy --strip-unneeded -R .eh_frame /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll objcopy /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll cp -f /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.debug /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/HelloWorld.debug "GenFw" -e UEFI_APPLICATION -o /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.efi /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.dll cp -f /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.efi /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT cp -f /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/HelloWorld.efi /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/HelloWorld.efi cp -f /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/DEBUG/*.map /home/fpm/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT - Done - Build end time: 02:32:11, Jan.26 2019 Build total time: 00:00:03 $
When you type build by itself, the Python-based tool checks …/UDK2018/Conf/target.txt, sees that it should use …/UDK2017/MyApps/MyApps.dsc to determine what package to build, and uses the CLANG70 toolchain to build a X64 RELEASE version of the application.
Examining the list of files generated by our build revels more interesting information:
$ cd ~/UDK2018/Build/MyApps/RELEASE_CLANG70/X64/MyApps/HelloWorld/HelloWorld/OUTPUT/
$ ll
-rw-rw-r-- 1 fpm fpm 30032 Jan 26 09:43 AutoGen.obj
-rw-rw-r-- 1 fpm fpm 6528 Jan 26 09:43 HelloWorld.efi
-rw-rw-r-- 1 fpm fpm 6129 Jan 26 09:43 HelloWorld.inf
-rw-rw-r-- 1 fpm fpm 36522 Jan 26 09:43 HelloWorld.lib
-rw-rw-r-- 1 fpm fpm 29916 Jan 26 09:43 HelloWorld.map
-rw-rw-r-- 1 fpm fpm 4524 Jan 26 09:43 HelloWorld.obj
-rw-rw-r-- 1 fpm fpm 200 Jan 26 09:42 object_files.lst
-rw-rw-r-- 1 fpm fpm 1672 Jan 26 09:42 static_library_files.lst
$ cd ~/UDK2017/Build/MyApps/DEBUG_GCC5/X64/MyApps/HelloWorld/HelloWorld/OUTPUT
$ ll
-rw-rw-r--. 1 fpm fpm 44032 Sep 27 12:03 AutoGen.obj
-rw-rw-r--. 1 fpm fpm 5888 Sep 27 12:03 HelloWorld.efi
-rw-rw-r--. 1 fpm fpm 5098 Sep 27 12:03 HelloWorld.inf
-rw-rw-r--. 1 fpm fpm 50640 Sep 27 12:03 HelloWorld.lib
-rw-rw-r--. 1 fpm fpm 34503 Sep 27 12:03 HelloWorld.map
-rw-rw-r--. 1 fpm fpm 4704 Sep 27 12:03 HelloWorld.obj
-rw-rw-r--. 1 fpm fpm 190 Sep 27 12:03 object_files.lst
-rw-rw-r--. 1 fpm fpm 1607 Sep 27 12:03 static_library_files.lst
$ file HelloWorld.efi
HelloWorld.efi: MS-DOS executable
$ objdump -x HelloWorld.efi
HelloWorld.efi: file format pei-x86-64
HelloWorld.efi
architecture: i386:x86-64, flags 0x0000010b:
HAS_RELOC, EXEC_P, HAS_DEBUG, D_PAGED
start address 0x000000000000119e
Characteristics 0x2e
executable
line numbers stripped
symbols stripped
large address aware
Time/Date Wed Dec 31 19:00:00 1969
Magic 020b (PE32+)
MajorLinkerVersion 0
MinorLinkerVersion 0
SizeOfCode 00001480
SizeOfInitializedData 00000240
SizeOfUninitializedData 00000000
AddressOfEntryPoint 000000000000119e
BaseOfCode 0000000000000240
ImageBase 0000000000000000
SectionAlignment 0000000000000040
FileAlignment 0000000000000040
MajorOSystemVersion 0
MinorOSystemVersion 0
MajorImageVersion 0
MinorImageVersion 0
MajorSubsystemVersion 0
MinorSubsystemVersion 0
Win32Version 00000000
SizeOfImage 00001980
SizeOfHeaders 00000240
CheckSum 00000000
Subsystem 0000000a (EFI application)
DllCharacteristics 00000000
SizeOfStackReserve 0000000000000000
SizeOfStackCommit 0000000000000000
SizeOfHeapReserve 0000000000000000
SizeOfHeapCommit 0000000000000000
LoaderFlags 00000000
NumberOfRvaAndSizes 00000010
The Data Directory
Entry 0 0000000000000000 00000000 Export Directory [.edata (or where ever we found it)]
Entry 1 0000000000000000 00000000 Import Directory [parts of .idata]
Entry 2 0000000000000000 00000000 Resource Directory [.rsrc]
Entry 3 0000000000000000 00000000 Exception Directory [.pdata]
Entry 4 0000000000000000 00000000 Security Directory
Entry 5 0000000000001900 00000080 Base Relocation Directory [.reloc]
Entry 6 0000000000001838 0000001c Debug Directory
Entry 7 0000000000000000 00000000 Description Directory
Entry 8 0000000000000000 00000000 Special Directory
Entry 9 0000000000000000 00000000 Thread Storage Directory [.tls]
Entry a 0000000000000000 00000000 Load Configuration Directory
Entry b 0000000000000000 00000000 Bound Import Directory
Entry c 0000000000000000 00000000 Import Address Table Directory
Entry d 0000000000000000 00000000 Delay Import Directory
Entry e 0000000000000000 00000000 CLR Runtime Header
Entry f 0000000000000000 00000000 Reserved
PE File Base Relocations (interpreted .reloc section contents)
Virtual Address: 00001000 Chunk size 128 (0x80) Number of fixups 60
reloc 0 offset 6c0 [16c0] DIR64
reloc 1 offset 6c8 [16c8] DIR64
reloc 2 offset 6d0 [16d0] DIR64
reloc 3 offset 6d8 [16d8] DIR64
reloc 4 offset 6e0 [16e0] DIR64
reloc 5 offset 6e8 [16e8] DIR64
reloc 6 offset 6f0 [16f0] DIR64
reloc 7 offset 6f8 [16f8] DIR64
reloc 8 offset 700 [1700] DIR64
reloc 9 offset 708 [1708] DIR64
reloc 10 offset 710 [1710] DIR64
reloc 11 offset 718 [1718] DIR64
reloc 12 offset 720 [1720] DIR64
reloc 13 offset 728 [1728] DIR64
reloc 14 offset 730 [1730] DIR64
reloc 15 offset 738 [1738] DIR64
reloc 16 offset 740 [1740] DIR64
reloc 17 offset 748 [1748] DIR64
reloc 18 offset 750 [1750] DIR64
reloc 19 offset 758 [1758] DIR64
reloc 20 offset 760 [1760] DIR64
reloc 21 offset 768 [1768] DIR64
reloc 22 offset 770 [1770] DIR64
reloc 23 offset 778 [1778] DIR64
reloc 24 offset 780 [1780] DIR64
reloc 25 offset 788 [1788] DIR64
reloc 26 offset 790 [1790] DIR64
reloc 27 offset 798 [1798] DIR64
reloc 28 offset 7a0 [17a0] DIR64
reloc 29 offset 7a8 [17a8] DIR64
reloc 30 offset 7b0 [17b0] DIR64
reloc 31 offset 7b8 [17b8] DIR64
reloc 32 offset 7c0 [17c0] DIR64
reloc 33 offset 7c8 [17c8] DIR64
reloc 34 offset 7d0 [17d0] DIR64
reloc 35 offset 7d8 [17d8] DIR64
reloc 36 offset 7e0 [17e0] DIR64
reloc 37 offset 7e8 [17e8] DIR64
reloc 38 offset 7f0 [17f0] DIR64
reloc 39 offset 0 [1000] ABSOLUTE
reloc 40 offset 0 [1000] ABSOLUTE
reloc 41 offset 0 [1000] ABSOLUTE
reloc 42 offset 0 [1000] ABSOLUTE
reloc 43 offset 0 [1000] ABSOLUTE
reloc 44 offset 0 [1000] ABSOLUTE
reloc 45 offset 0 [1000] ABSOLUTE
reloc 46 offset 0 [1000] ABSOLUTE
reloc 47 offset 0 [1000] ABSOLUTE
reloc 48 offset 0 [1000] ABSOLUTE
reloc 49 offset 0 [1000] ABSOLUTE
reloc 50 offset 0 [1000] ABSOLUTE
reloc 51 offset 0 [1000] ABSOLUTE
reloc 52 offset 0 [1000] ABSOLUTE
reloc 53 offset 0 [1000] ABSOLUTE
reloc 54 offset 0 [1000] ABSOLUTE
reloc 55 offset 0 [1000] ABSOLUTE
reloc 56 offset 0 [1000] ABSOLUTE
reloc 57 offset 0 [1000] ABSOLUTE
reloc 58 offset 0 [1000] ABSOLUTE
reloc 59 offset 0 [1000] ABSOLUTE
There is a debug directory in .data at 0x1838
Type Size Rva Offset
2 CodeView 00000075 00001854 00001854
(format NB10 signature 00000000 age 0)
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00001480 0000000000000240 0000000000000240 00000240 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .data 00000240 00000000000016c0 00000000000016c0 000016c0 2**4
CONTENTS, ALLOC, LOAD, DATA
2 .reloc 00000080 0000000000001900 0000000000001900 00001900 2**2
CONTENTS, ALLOC, LOAD, READONLY, DATA
SYMBOL TABLE:
no symbols
$
Interestingly, the Clang 7.0 toolchain produces a slighly bigger executable than the GCC 7 toolchain I use with UDK2017. If I find time to investigate why, I will update this post.
You should now have sufficient information to start developing UEFI applications on Fedora 29 using the Clang 7.0 toolchain.
Enjoy!
Thanks, but please change EDK 11 to EDK II (II here is 2 in roman numeric system).
https://github.com/tianocore/tianocore.github.io/wiki/EDK-II
Thanks for spotting the error. Fixed