Comparaison build LLVM 8 build different way
GCC 8.3.0


Xcode 10: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

GCC 8.2.0: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

LLVM 7.0.1: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

LLVM 8 Build with LLVM 7: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

LLVM 8 Build with Xcode 10: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.13.6, Kernel: 17.7.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Clang 7.0.1 + GCC 4.2.1 + LLVM 7.0.1 + Xcode 10.1, File-System: MS-DOS FAT16, Screen Resolution: 2880x1800

Xcode 10.1 Mojave: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.14.4, Kernel: 18.5.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Apple LLVM 10.0.1 (clang-1001.0.46.4) + GCC 4.2.1 + Xcode 10.2.1, File-System: APFS, Screen Resolution: 2880x1800

Xcode 10.1 Mojave march=ivybridge: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.14.4, Kernel: 18.5.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Apple LLVM 10.0.1 (clang-1001.0.46.4) + GCC 4.2.1 + Xcode 10.2.1, File-System: APFS, Screen Resolution: 2880x1800

GCC 8.3.0: 

	Processor: Intel Core i7 @ 2.30GHz (4 Cores / 8 Threads), Motherboard: Apple MacBook Pro, Chipset: Intel 7, Memory: 2 x 4 GB DDR3-1600MHz, Disk: 251GB APPLE SSD SM256E, Graphics: Intel HD 4000 + NVIDIA GeForce GT 650M 2GB, Monitor: Color LCD

	OS: macOS 10.14.4, Kernel: 18.5.0 (x86_64), Display Server: X Server 1.18.4, OpenGL: 2.1, Compiler: Apple LLVM 10.0.1 (clang-1001.0.46.4) + GCC 4.2.1 + Xcode 10.2.1, File-System: APFS, Screen Resolution: 2880x1800


GraphicsMagick 1.3.30
Operation: Sharpen
Iterations Per Minute > Higher Is Better
Xcode 10 .......................... 47  |================
GCC 8.2.0 ......................... 110 |=====================================
LLVM 7.0.1 ........................ 47  |================
LLVM 8 Build with LLVM 7 .......... 47  |================
LLVM 8 Build with Xcode 10 ........ 47  |================
Xcode 10.1 Mojave ................. 45  |===============
Xcode 10.1 Mojave march=ivybridge . 19  |======
GCC 8.3.0 ......................... 113 |======================================


GraphicsMagick 1.3.30
Operation: Resizing
Iterations Per Minute > Higher Is Better
Xcode 10 .......................... 96  |======================
GCC 8.2.0 ......................... 163 |======================================
LLVM 7.0.1 ........................ 96  |======================
LLVM 8 Build with LLVM 7 .......... 99  |=======================
LLVM 8 Build with Xcode 10 ........ 99  |=======================
Xcode 10.1 Mojave ................. 92  |=====================
Xcode 10.1 Mojave march=ivybridge . 39  |=========
GCC 8.3.0 ......................... 165 |======================================


GraphicsMagick 1.3.30
Operation: HWB Color Space
Iterations Per Minute > Higher Is Better
Xcode 10 .......................... 129 |==========================
GCC 8.2.0 ......................... 184 |=====================================
LLVM 7.0.1 ........................ 130 |==========================
LLVM 8 Build with LLVM 7 .......... 131 |==========================
LLVM 8 Build with Xcode 10 ........ 131 |==========================
Xcode 10.1 Mojave ................. 124 |=========================
Xcode 10.1 Mojave march=ivybridge . 60  |============
GCC 8.3.0 ......................... 189 |======================================


7-Zip Compression 16.02
Compress Speed Test
MIPS > Higher Is Better
Xcode 10 .......................... 19036 |====================================
GCC 8.2.0 ......................... 18212 |==================================
Xcode 10.1 Mojave ................. 17626 |=================================
Xcode 10.1 Mojave march=ivybridge . 18409 |===================================
GCC 8.3.0 ......................... 18567 |===================================


Timed Apache Compilation 2.4.7
Time To Compile
Seconds < Lower Is Better
Xcode 10 .......................... 48.55 |=============================
LLVM 8 Build with Xcode 10 ........ 60.60 |====================================
Xcode 10.1 Mojave ................. 48.22 |=============================
Xcode 10.1 Mojave march=ivybridge . 29.23 |=================


Timed ImageMagick Compilation 6.9.0
Time To Compile
Seconds < Lower Is Better
Xcode 10 .......................... 73.44  |===================
GCC 8.2.0 ......................... 131.83 |===================================
LLVM 7.0.1 ........................ 107.16 |============================
LLVM 8 Build with LLVM 7 .......... 131.37 |===================================
LLVM 8 Build with Xcode 10 ........ 125.89 |=================================
Xcode 10.1 Mojave ................. 80.24  |=====================
Xcode 10.1 Mojave march=ivybridge . 30.74  |========
GCC 8.3.0 ......................... 126.44 |==================================


Timed PHP Compilation 7.1.9
Time To Compile
Seconds < Lower Is Better
Xcode 10 ................... 171 |============================
GCC 8.2.0 .................. 209 |==================================
LLVM 7.0.1 ................. 244 |========================================
LLVM 8 Build with LLVM 7 ... 274 |=============================================
LLVM 8 Build with Xcode 10 . 267 |============================================


C-Ray 1.1
Total Time - 4K, 16 Rays Per Pixel
Seconds < Lower Is Better
Xcode 10 .......................... 368 |======================================
GCC 8.2.0 ......................... 304 |===============================
Xcode 10.1 Mojave ................. 370 |======================================
Xcode 10.1 Mojave march=ivybridge . 336 |===================================
GCC 8.3.0 ......................... 304 |===============================