I am facing some struggles trying running EmulatorPkg.

I am using a x86-64 machine using Ubuntu 18.04 and GCC5, install the dependencies libx11-dev libxext-dev according to https://github.com/tianocore/tianocore.github.io/wiki/EmulatorPkg.

When directly (./Host in Build folder) running Host I got the following output:

EDK II UNIX Host Emulation Environment from http://www.tianocore.org/edk2/
BootMode 0x00
OS Emulator passing in 128 KB of temp RAM at 0x40000000 to SEC
FD loaded from ../FV/FV_RECOVERY.fd at 0x102000000 contains SEC Core

0x102000400 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/EmulatorPkg/Sec/Sec/DEBUG/EmuSec.dll with entry point 0x10200163f
SEC Has Started
0x102002780 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/MdeModulePkg/Core/Pei/PeiMain/DEBUG/PeiCore.dll with entry point 0x10200c4cf
0x102014200 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/MdeModulePkg/Universal/ReportStatusCodeRouter/Pei/ReportStatusCodeRouterPei/DEBUG/ReportStatusCodeRouterPei.dll with entry point 0x102014fdb
0x102015c80 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/MdeModulePkg/Universal/StatusCodeHandler/Pei/StatusCodeHandlerPei/DEBUG/StatusCodeHandlerPei.dll with entry point 0x10201767a
PROGRESS CODE: V03020003 I0
0x10200ed00 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/MdeModulePkg/Universal/PCD/Pei/Pcd/DEBUG/PcdPeim.dll with entry point 0x102012c0a
Loading PEIM at 0x0010200EAC0 EntryPoint=0x00102012C0A PcdPeim.efi
PROGRESS CODE: V03020002 I0
Install PPI: 06E81C58-4AD7-44BC-8390-F10265F72480
Install PPI: 01F34D25-4DE2-23AD-3FF3-36353FF323F1
Install PPI: 4D8B155B-C059-4C8F-8926-06FD4331DB8A
Install PPI: A60C6B59-E459-425D-9C69-0BCC9CB27D81
Register PPI Notify: 605EA650-C65C-42E1-BA80-91A52AB618C6
PROGRESS CODE: V03020003 I0
0x102018800 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/EmulatorPkg/BootModePei/BootModePei/DEBUG/BootModePei.dll with entry point 0x10201908b
Loading PEIM at 0x001020185C0 EntryPoint=0x0010201908B BootModePei.efi
PROGRESS CODE: V03020002 I0
Emu Boot Mode PEIM Loaded
Install PPI: 7408D748-FC8C-4EE6-9288-C4BEC092A410
PROGRESS CODE: V03020003 I0
0x102019b00 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/EmulatorPkg/AutoScanPei/AutoScanPei/DEBUG/AutoScanPei.dll with entry point 0x10201a4b3
Loading PEIM at 0x001020198C0 EntryPoint=0x0010201A4B3 AutoScanPei.efi
PROGRESS CODE: V03020002 I0
Emu Autoscan PEIM Loaded
PeiInstallPeiMemory MemoryBegin 0x41000000, MemoryLength 0x4000000
PROGRESS CODE: V03020003 I0
Temp Stack : BaseAddress=0x40000000 Length=0x10000
Temp Heap : BaseAddress=0x40010000 Length=0x10000
Total temporary memory: 131072 bytes.
temporary memory stack ever used: 65532 bytes.
temporary memory heap used for HobList: 5240 bytes.
temporary memory heap occupied by memory pages: 0 bytes.
Old Stack size 65536, New stack size 131072
Stack Hob: BaseAddress=0x41000000 Length=0x20000
Heap Offset = 0x1010000 Stack Offset = 0x1010000
0x44ff2240 Loading /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/MdeModulePkg/Core/Pei/PeiMain/DEBUG/PeiCore.dll with entry point 0x44ffbf8f
Segmentation fault (core dumped)

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When running using EmulatorPkg/build.sh run, it opens gdb terminal and the application is not running:

Initializing workspace
/home/diego/Desktop/edk2/BaseTools
Loading previous configuration from /home/diego/Desktop/edk2/Conf/BuildEnv.sh
WORKSPACE: /home/diego/Desktop/edk2
EDK_TOOLS_PATH: /home/diego/Desktop/edk2/BaseTools
CONF_PATH: /home/diego/Desktop/edk2/Conf
using prebuilt tools
Reading symbols from /home/diego/Desktop/edk2/Build/Emulator/DEBUG_GCC5/X64/Host...(no debugging symbols found)...done.
/home/diego/Desktop/edk2/EmulatorPkg/Unix/GdbRun:79: Error in sourced command file:
No symbol table is loaded. Use the "file" command.
(gdb) c
The program is not being run.
(gdb)

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I tried in both master branch and tag vUDK2018.

This seems like an old thread. https://edk2.groups.io/g/devel/topic/30916071

I remember I also saw segmentation fault as well. Disabling optimization works for me.

EmulatorPkg.dsc
MdeModulePkg/Core/Pei/PeiMain.inf {
<BuildOptions>
GCC:*_*_*_CC_FLAGS = -O0
}