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| author | Kimplul <kimi.h.kuparinen@gmail.com> | 2022-01-06 23:39:12 +0200 |
|---|---|---|
| committer | Kimplul <kimi.h.kuparinen@gmail.com> | 2022-01-07 14:05:06 +0200 |
| commit | 9cc125fb3cfdc2c8ae7153b5ae0fe705980835fb (patch) | |
| tree | a1974f9513458acab0bd8d09758259b24b6d7d8c /Makefile | |
| parent | f0eba93472e0afecc57180fc0d638eeef8e6f3c6 (diff) | |
| download | kmi-9cc125fb3cfdc2c8ae7153b5ae0fe705980835fb.tar.gz kmi-9cc125fb3cfdc2c8ae7153b5ae0fe705980835fb.zip | |
Allow building with clang
+ Release mode is sort of broken, as lto doesn't work with linker
relaxation and turning the relaxation off causes issues with the jump
from init to kernel (as I've currently implemented it, could probably
be fixed with a manual jump from assembly, I'll add it to my TODO
list)
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 46 |
1 files changed, 27 insertions, 19 deletions
@@ -1,25 +1,30 @@ DO != echo > deps.mk # this could be done better -DEBUGFLAGS != [ $(RELEASE) ] && echo "-flto -O2" || echo "-O0 -ggdb3 -DDEBUG" -CFLAGS = -fno-pie -ffreestanding -nostdlib -std=c17 -Wall -Wextra -LINTFLAGS = -fsyntax-only +DEBUGFLAGS != [ $(RELEASE) ] \ + && echo "-flto -O2" \ + || echo "-O0 -ggdb3 -DDEBUG" + +CFLAGS = -ffreestanding -nostdlib -std=c17 -Wall -Wextra DEPFLAGS = -MT $@ -MMD -MP -MF $@.d +LINTFLAGS = -fsyntax-only +PREPROCESS = -E +LINKFLAGS = all: apos.bin # default values, overwrite if/when needed -ARCH ?= riscv -CROSS_COMPILE ?= riscv64-unknown-elf- +ARCH ?= riscv64 +CROSS_COMPILE ?= $(ARCH)-unknown-elf -# Common programs -CC := gcc -AR := ar -CPP := cpp -OBJCOPY ?= objcopy +OBJCOPY != [ $(LLVM) ] \ + && echo llvm-objcopy \ + || echo $(CROSS_COMPILE)-objcopy + +COMPILER != [ $(LLVM) ] \ + && echo clang --target="$(CROSS_COMPILE)" \ + || echo $(CROSS_COMPILE)-gcc -# This makes sure .bss is loaded into the binary -OBJCOPY_FLAGS ?= -Obinary --set-section-flags .bss=alloc,load,contents KERNEL_SOURCES != echo common/*.c common/uapi/*.c lib/*.c CLEANUP := build deps.mk kernel.* init.* apos.bin @@ -31,16 +36,19 @@ include arch/$(ARCH)/source.mk INCLUDE_FLAGS := -I include -I arch/$(ARCH)/include\ -include config.h -include arch/$(ARCH)/config.h -COMPILE = $(CROSS_COMPILE)$(CC) $(DEBUGFLAGS)\ +# This makes sure .bss is loaded into the binary +OBJCOPY_FLAGS ?= -Obinary --set-section-flags .bss=alloc,load,contents + +COMPILE = $(COMPILER) $(DEBUGFLAGS)\ $(CFLAGS) $(ARCH_FLAGS) $(DEPFLAGS) $(INCLUDE_FLAGS) -LINT = $(CROSS_COMPILE)$(CC) $(DEBUGFLAGS)\ +LINT = $(COMPILER) $(DEBUGFLAGS)\ $(CFLAGS) $(ARCH_FLAGS) $(LINTFLAGS) $(INCLUDE_FLAGS) -GENELF = $(CROSS_COMPILE)$(CC) $(DEBUGFLAGS)\ - $(CFLAGS) $(ARCH_FLAGS) $(INCLUDE_FLAGS) +GENELF = $(COMPILER) $(DEBUGFLAGS)\ + $(CFLAGS) $(ARCH_FLAGS) $(LINKFLAGS) $(INCLUDE_FLAGS) -GENLINK = $(CROSS_COMPILE)$(CPP) $(DEPFLAGS) $(INCLUDE_FLAGS) +GENLINK = $(COMPILER) $(PREPROCESS) $(DEPFLAGS) $(INCLUDE_FLAGS) STRIPLINK = sed -n '/^[^\#]/p' KERN_SIZE = wc -c kernel.bin | cut -d ' ' -f 1 KERN_INFO = sed "s/<KERNEL_SIZE>/$$($(KERN_SIZE))/" @@ -66,10 +74,10 @@ kernel.elf: $(KERNEL_OBJECTS) $(KERNEL_LD) $(GENELF) -T $(KERNEL_LD) $(KERNEL_OBJECTS) -o $@ init.bin: init.elf - $(CROSS_COMPILE)$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@ + $(OBJCOPY) $(OBJCOPY_FLAGS) $< $@ kernel.bin: kernel.elf - $(CROSS_COMPILE)$(OBJCOPY) $(OBJCOPY_FLAGS) $< $@ + $(OBJCOPY) $(OBJCOPY_FLAGS) $< $@ apos.bin: init.bin kernel.bin cat init.bin kernel.bin > apos.bin |