Architectures Supported by GCC: Alpha, ARM, AVR, Blackfin, Epiphany (GCC 4.8), H8 / 300, HC12, IA-32 (x86), IA-64 (Intel Itanium), MIPS, Motorola 68000, PA-RISC, PDP-11, PowerPC, R8C / M16C / M32C, SPARC, SPU, SuperH, System / 390 / zSeries, VAX, x86-64, 68HC11, A29K, CR16, C6x, D30V, DSP16xx, ETRAX CRIS, FR-30, FR-V, Intel i960, IP2000, M32R, MCORE, MIL-STD-1750A, MMIX, MN10200, MN10300, Motorola 88000, NS32K, IBM ROMP, RL78, Stormy16, V850, Xtensa, Cortus APS3, ARC, AVR32, C166, D10V, EISC, eSi -RISC, Hexagon, LatticeMico32, LatticeMico8, MeP, MicroBlaze, Motorola 6809, MSP430, NEC SX architecture, Nios II and Nios, OpenRISC, PDP-10, PIC24 / dsPIC, PIC32, Propeller, RISC-V, Saturn (HP48XGCC), System / 370, TIGCC (m68k variant), TriCore, Z8000 and ZPU.

Architectures Supported by LLVM: X86, X86-64, PowerPC, PowerPC-64, ARM, Thumb, SPARC, Alpha, CellSPU, MIPS, MSP430, SystemZ, WebAssembly, and XCore.

• У LLVM всё лучше со статическим анализом. GCC более highly coupled.
• У LLVM лучше с выводом ошибок