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Merge patch series "Fixes for Clang builds for AArch64, improve CROSS_COMPILE handling"

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Dmitrii Sharshakov <d3dx12.xx@gmail.com> says:

Initially fix the inconsistency reported in reply to the previous
series and also make sure AArch64 images can be built with latest
Clang versions by guarding AArch32-specific options behind extra
config checks.

Tested qemu_arm_defconfig and qemu_arm64_defconfig with Clang 21,
mainline (to be 22) ce7f9f9c and also Clang 18 (for AArch64 only, as I
have not managed to build an AArch32 image with clang-18).

Link: https://lore.kernel.org/r/20251108-clang-cross-fixes-v1-0-ea6c4282844a@gmail.com
This commit is contained in:
Tom Rini
2025-11-18 15:53:18 -06:00
parent 91861e5a30 2ed758fa7e
commit a70b4f5cae
2 changed files with 7 additions and 6 deletions
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Makefile
+1 -1
View File
@@ -600,7 +600,7 @@ ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
ifneq ($(CROSS_COMPILE),)
CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE:%-=%))-
GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
endif
ifneq ($(GCC_TOOLCHAIN),)
arch/arm/config.mk
+6 -5
View File
@@ -30,18 +30,19 @@ PLATFORM_RELFLAGS += $(call cc-option,-mgeneral-regs-only)
endif
# LLVM support
LLVM_RELFLAGS := $(call cc-option,-mllvm,) \
$(call cc-option,-mno-movt,)
PLATFORM_RELFLAGS += $(LLVM_RELFLAGS)
LLVM_RELFLAGS := $(call cc-option,-mllvm,)
PLATFORM_CPPFLAGS += -D__ARM__
ifdef CONFIG_ARM64
PLATFORM_ELFFLAGS += -B aarch64 -O elf64-littleaarch64
else
PLATFORM_ELFFLAGS += -B arm -O elf32-littlearm
# no-movt is only available when targeting AArch32
LLVM_RELFLAGS += $(call cc-option,-mno-movt,)
endif
PLATFORM_RELFLAGS += $(LLVM_RELFLAGS)
# Choose between ARM/Thumb instruction sets
ifeq ($(CONFIG_$(PHASE_)SYS_THUMB_BUILD),y)
AFLAGS_IMPLICIT_IT := $(call as-option,-Wa$(comma)-mimplicit-it=always)
@@ -50,7 +51,7 @@ PF_CPPFLAGS_ARM := $(AFLAGS_IMPLICIT_IT) \
$(call cc-option,-marm,)\
$(call cc-option,-mno-thumb-interwork,)\
)
else
else ifneq ($(CONFIG_ARM64),y)
PF_CPPFLAGS_ARM := $(call cc-option,-marm,) \
$(call cc-option,-mno-thumb-interwork,)
endif