The LTO link rules put $(PLATFORM_LIBS) inside --whole-archive. This works with U-Boot's private libgcc, but pulls every member of a toolchain libgcc into the link. With Debian's GCC 14.2, turris_1x_nor fails to link with CONFIG_LTO=y: ld rejects the hard-float members in this soft-float build, while other members reference __morestack_fail, __tls_get_addr or __SDATA_START__.
Select USE_PRIVATE_LIBGCC for mpc85xx LTO builds. The previous two patches add the routines it was missing. This has no effect until a later patch allows LTO on mpc85xx. Signed-off-by: Josef Schlehofer <[email protected]> Cc: Tom Rini <[email protected]> Cc: Marek Behún <[email protected]> Cc: Priyanka Jain <[email protected]> --- Changes in v2: - new patch, instead of "Makefile: Link a toolchain libgcc outside --whole-archive with LTO" With the whole series, all 71 mpc85xx defconfigs link with CONFIG_LTO=y. --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index f20d58b4de6..b4883e00458 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -21,6 +21,7 @@ config MPC85xx select SYS_FSL_DDR select SYS_FSL_DDR_BE select SYS_FSL_IFC_BE + select USE_PRIVATE_LIBGCC if LTO select BINMAN if MPC85XX_HAVE_RESET_VECTOR && OF_SEPARATE imply CMD_HASH imply CMD_IRQ -- 2.54.0 (Apple Git-157)
