riscv: Implement ARCH_HAS_CC_CAN_LINK

The generic CC_CAN_LINK detection relies on -m32/-m64 compiler flags.
These are not supported by riscv compilers.

Use architecture-specific logic using -mabi instead.

Prefer the 'd' ABI variant when possible as todays toolchains are most
likely to provide a libc for that one.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20260316-cc-can-link-riscv-v4-1-64c072b456dd@linutronix.de
Signed-off-by: Paul Walmsley <pjw@kernel.org>

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c5754942cf85a4b47f16ba9a65eb455f74e6985b..a5e4f438e38145c58cddd4413faf7f9965b8d489 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -24,6 +24,7 @@ config RISCV
        select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
        select ARCH_ENABLE_THP_MIGRATION if TRANSPARENT_HUGEPAGE
        select ARCH_HAS_BINFMT_FLAT
+       select ARCH_HAS_CC_CAN_LINK
        select ARCH_HAS_CURRENT_STACK_POINTER
        select ARCH_HAS_DEBUG_VIRTUAL if MMU
        select ARCH_HAS_DEBUG_VM_PGTABLE
@@ -1353,6 +1354,20 @@ config PORTABLE
 config ARCH_PROC_KCORE_TEXT
        def_bool y
 
+config ARCH_CC_CAN_LINK
+       bool
+       default $(cc_can_link_user,-march=rv64g -mabi=lp64d) if 64BIT && FPU
+       default $(cc_can_link_user,-march=rv64g -mabi=lp64) if 64BIT
+       default $(cc_can_link_user,-march=rv32g -mabi=ilp32d) if FPU
+       default $(cc_can_link_user,-march=rv32g -mabi=ilp32)
+
+config ARCH_USERFLAGS
+       string
+       default "-march=rv64g -mabi=lp64d" if 64BIT && FPU
+       default "-march=rv64g -mabi=lp64" if 64BIT
+       default "-march=rv32g -mabi=ilp32d" if FPU
+       default "-march=rv32g -mabi=ilp32"
+
 menu "Power management options"
 
 source "kernel/power/Kconfig"