qemu/edk2 build on ubuntu 20.04

[bracha landau]

  I"m new to linuxboot, so thanks for your patience.

I'm  building qemu on ubuntu 20.04.

gcc version 9.3.0

Building on ubuntu 16.04 worked fine.

The edk2 build gives the following build error :

gcc  -c -MD -fshort-wchar -fno-strict-aliasing -Wall -Werror -Wno-deprecated-declarations -Wno-unused-result -nostdlib -c -g  -I .. -I ../Include/Common -I ../Include/ -I ../Include/IndustryStandard -I ../Common/ -I .. -I . -I ../Include/X64/  -O2 EfiUtilityMsgs.c -o EfiUtilityMsgs.o
In file included from /usr/include/string.h:495,
                 from EfiUtilityMsgs.c:16:
In function ‘strncat’,
    inlined from ‘PrintMessage’ at EfiUtilityMsgs.c:484:9:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:136:10: error: ‘__builtin___strncat_chk’ output may be truncated copying between 0 and 511 bytes from a string of length 511 [-Werror=stringop-truncation]
  136 |   return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncat’,
    inlined from ‘PrintMessage’ at EfiUtilityMsgs.c:469:9:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:136:10: error: ‘__builtin___strncat_chk’ output may be truncated copying between 0 and 511 bytes from a string of length 511 [-Werror=stringop-truncation]
  136 |   return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In function ‘strncat’,
    inlined from ‘PrintMessage’ at EfiUtilityMsgs.c:511:5:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:136:10: error: ‘__builtin___strncat_chk’ output may be truncated copying between 0 and 511 bytes from a string of length 511 [-Werror=stringop-truncation]
  136 |   return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest));

I added -Wno-stringop-truncation and -Wno-stringop-overflow to the header.makefile in the edk2.

But even so, after the build process finished I got the following error:

make[1]: Entering directory '/home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables'
"gcc" -c -o /home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables/OUTPUT/./Facp.obj -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=PlatformAcpiTablesStrings -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 -mno-mmx -mno-sse -D DISABLE_NEW_DEPRECATED_INTERFACES -x c -m64 -fno-lto -I/home/linuxboot/edk2/OvmfPkg/AcpiTables -I/home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables/DEBUG -I/home/linuxboot/edk2/MdePkg -I/home/linuxboot/edk2/MdePkg/Include -I/home/linuxboot/edk2/MdePkg/Include/X64 -I/home/linuxboot/edk2/OvmfPkg -I/home/linuxboot/edk2/OvmfPkg/Include /home/linuxboot/edk2/OvmfPkg/AcpiTables/Facp.aslc
"gcc" -o /home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables/OUTPUT/./Facp.dll -nostdlib -Wl,-n,-q,--gc-sections -z common-page-size=0x40 -Wl,--entry,ReferenceAcpiTable -u ReferenceAcpiTable -Wl,-m,elf_x86_64 /home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables/OUTPUT/./Facp.obj
/usr/bin/ld: /home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables/OUTPUT/./Facp.dll: error: PHDR segment not covered by LOAD segment
collect2: error: ld returned 1 exit status
make[1]: Leaving directory '/home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables'
make[1]: *** [GNUmakefile:360: /home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables/OUTPUT/Facp.acpi] Error 1


build.py...
 : error 7000: Failed to execute command
make tbuild [/home/linuxboot/edk2/Build/OvmfX64/DEBUG_GCC5/X64/OvmfPkg/AcpiTables/AcpiTables]


build.py...
 : error F002: Failed to build module
/home/linuxboot/edk2/OvmfPkg/AcpiTables/AcpiTables.inf [X64, GCC5, DEBUG]