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build: use GCC to link by default

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When configuring GNU GCC as the C compiler, we usually use the GNU BFD
linker directly to link by default. However, this complicates things
because we also need to support LTO, which can only be done when linking
is done via the C compiler, and we cannot change the linker later on if
some other part of the build system wants to enable LTO.

This change migrates the default choice of linker to GCC if the C
compiler is GCC, in order to enable this use-case. This should have no
impact on anything outside of the build system, as by default GCC merely
acts as a wrapper around BFD.

Change-Id: I40771be2b0571def67bbfde9e877e7629ec8cdaa
Signed-off-by: Chris Kay <chris.kay@arm.com>
This commit is contained in:
Chris Kay 2024-02-21 12:52:46 +00:00
parent 753da8ce45
commit 2f1c5e7eb1
7 changed files with 15 additions and 14 deletions
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5
lib/romlib/Makefile
View file

@ -30,9 +30,10 @@ else
Q :=
endif
LDFLAGS := --gc-sections -O1
LDFLAGS := -Wl,--gc-sections -nostdlib
ifeq ($(DEBUG),1)
LDFLAGS += -Map=$(MAPFILE)
LDFLAGS += -Wl,-Map=$(MAPFILE)
endif
ifeq (${ARM_ARCH_MINOR},0)

2
make_helpers/toolchain.mk
View file

@ -287,7 +287,7 @@ guess-llvm-clang-ar = $(shell $(1) --print-prog-name llvm-ar 2>$(nul))
guess-gnu-gcc-cpp = $(1) # Use the C compiler
guess-gnu-gcc-as = $(1) # Use the C compiler
guess-gnu-gcc-ld = $(if $(filter 1,$(ENABLE_LTO)),$(1),$(shell $(1) --print-prog-name ld.bfd 2>$(nul)))
guess-gnu-gcc-ld = $(1) # Use the C compiler
guess-gnu-gcc-oc = $(shell $(1) --print-prog-name objcopy 2>$(nul))
guess-gnu-gcc-od = $(shell $(1) --print-prog-name objdump 2>$(nul))
guess-gnu-gcc-ar = $(patsubst %$(notdir $(1)),%$(subst gcc,gcc-ar,$(notdir $(1))),$(1))

2
make_helpers/toolchains/aarch32.mk
View file

@ -7,7 +7,7 @@
aarch32-cc-default := $(or $(CROSS_COMPILE),arm-none-eabi-)gcc
aarch32-cpp-default := $(or $(CROSS_COMPILE),arm-none-eabi-)gcc
aarch32-as-default := $(or $(CROSS_COMPILE),arm-none-eabi-)gcc
aarch32-ld-default := $(or $(CROSS_COMPILE),arm-none-eabi-)ld.bfd
aarch32-ld-default := $(or $(CROSS_COMPILE),arm-none-eabi-)gcc
aarch32-oc-default := $(or $(CROSS_COMPILE),arm-none-eabi-)objcopy
aarch32-od-default := $(or $(CROSS_COMPILE),arm-none-eabi-)objdump
aarch32-ar-default := $(or $(CROSS_COMPILE),arm-none-eabi-)gcc-ar

2
make_helpers/toolchains/aarch64.mk
View file

@ -7,7 +7,7 @@
aarch64-cc-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)gcc
aarch64-cpp-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)gcc
aarch64-as-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)gcc
aarch64-ld-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)ld.bfd
aarch64-ld-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)gcc
aarch64-oc-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)objcopy
aarch64-od-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)objdump
aarch64-ar-default := $(or $(CROSS_COMPILE),aarch64-none-elf-)gcc-ar

2
make_helpers/toolchains/rk3399-m0.mk
View file

@ -7,7 +7,7 @@
rk3399-m0-cc-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)gcc
rk3399-m0-cpp-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)gcc
rk3399-m0-as-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)gcc
rk3399-m0-ld-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)ld.bfd
rk3399-m0-ld-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)gcc
rk3399-m0-oc-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)objcopy
rk3399-m0-od-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)objdump
rk3399-m0-ar-default := $(or $(M0_CROSS_COMPILE),arm-none-eabi-)gcc-ar

8
tools/renesas/rcar_layout_create/makefile
View file

@ -89,19 +89,19 @@ all: $(OUTPUT_FILE_SA0) $(OUTPUT_FILE_SA6)
# Linker
###################################################
$(OUTPUT_FILE_SA0) : $(MEMORY_DEF_SA0) $(OBJ_FILE_SA0)
$(aarch64-ld) $(OBJ_FILE_SA0) \
$(aarch64-ld) $(OBJ_FILE_SA0) -nostdlib \
-T $(MEMORY_DEF_SA0) \
-o $(OUTPUT_FILE_SA0) \
-Map $(FILE_NAME_SA0).map \
-Wl,-Map $(FILE_NAME_SA0).map \
$(aarch64-oc) -O srec --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA0) $(FILE_NAME_SA0).srec
$(aarch64-oc) -O binary --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA0) $(FILE_NAME_SA0).bin
$(OUTPUT_FILE_SA6) : $(MEMORY_DEF_SA6) $(OBJ_FILE_SA6)
$(aarch64-ld) $(OBJ_FILE_SA6) \
$(aarch64-ld) $(OBJ_FILE_SA6) -nostdlib \
-T $(MEMORY_DEF_SA6) \
-o $(OUTPUT_FILE_SA6) \
-Map $(FILE_NAME_SA6).map \
-Wl,-Map $(FILE_NAME_SA6).map \
$(aarch64-oc) -O srec --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA6) $(FILE_NAME_SA6).srec
$(aarch64-oc) -O binary --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA6) $(FILE_NAME_SA6).bin

8
tools/renesas/rzg_layout_create/makefile
View file

@ -86,19 +86,19 @@ all: $(OUTPUT_FILE_SA0) $(OUTPUT_FILE_SA6)
# Linker
###################################################
$(OUTPUT_FILE_SA0) : $(MEMORY_DEF_SA0) $(OBJ_FILE_SA0)
$(aarch64-ld) $(OBJ_FILE_SA0) \
$(aarch64-ld) $(OBJ_FILE_SA0) -nostdlib \
-T $(MEMORY_DEF_SA0) \
-o $(OUTPUT_FILE_SA0) \
-Map $(FILE_NAME_SA0).map \
-Wl,-Map $(FILE_NAME_SA0).map \
$(aarch64-oc) -O srec --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA0) $(FILE_NAME_SA0).srec
$(aarch64-oc) -O binary --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA0) $(FILE_NAME_SA0).bin
$(OUTPUT_FILE_SA6) : $(MEMORY_DEF_SA6) $(OBJ_FILE_SA6)
$(aarch64-ld) $(OBJ_FILE_SA6) \
$(aarch64-ld) $(OBJ_FILE_SA6) -nostdlib \
-T $(MEMORY_DEF_SA6) \
-o $(OUTPUT_FILE_SA6) \
-Map $(FILE_NAME_SA6).map \
-Wl,-Map $(FILE_NAME_SA6).map \
$(aarch64-oc) -O srec --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA6) $(FILE_NAME_SA6).srec
$(aarch64-oc) -O binary --adjust-vma=$(RCAR_VMA_ADJUST_ADDR) --srec-forceS3 $(OUTPUT_FILE_SA6) $(FILE_NAME_SA6).bin