Unable to build the ZynqMP platform with armclang when ENABLE_LTO=1.
by Taticharla, Venkata Sai
[AMD Official Use Only - AMD Internal Distribution Only]
Hello Maintainers,
we are trying to build TF‑A BL31 for the ZynqMP (Cortex‑A53) platform with Arm Compiler 6 (armclang) and ENABLE_LTO=1, and I’m running into several toolchain‑related build and link issues.
Setup :
Platform: ZynqMP
Toolchains:
Arm Compiler for Embedded 6.16.2 (armclang)
Xilinx AArch64 GNU tools from Vitis 2025.2 (aarch64-xilinx-elf-*)
LTO is enabled in plat/xilinx/zynqmp/platform.mk via ENABLE_LTO := 1.
Issues observed :
With CC=armclang and AArch64 linker (GCC), the build fails with:
armclang: error: unknown argument: '-flto-partition=one'
This flag appears when ENABLE_LTO=1 and the linker is detected as gnu-gcc.
If I keep CC=armclang and ENABLE_LTO=1 but change the linker, I get linker‑specific errors
With the Arm linker (LD=armlink or LD=armclang, which invokes armlink under the hood):
Fatal error: L3900U: Unrecognized option '-z'.
This is due to GNU‑style -z options (and similar flags) being passed to armlink.
As -z options is specific to GNU linker, a armlink style flag would address the unrecognised option but we are observing dependency on scatter files.
Fatal error: L6031U: Could not open scatter description file plat/xilinx/zynqmp//scat/bl31.scat: No such file or directory
Could you please help us with pointers to address the linker issues .
With regards ,
Venkata Sai .T .
