75 lines
1.7 KiB
Makefile
75 lines
1.7 KiB
Makefile
# Nuke built-in rules and variables.
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MAKEFLAGS += -rR
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.SUFFIXES:
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# Target architecture.
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ARCH := x86_64
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# Auto-detect cross compiler from toolchain/local/.
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TOOLCHAIN_PREFIX := $(shell cd .. && pwd)/toolchain/local/bin/x86_64-elf-
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ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
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CXX := $(TOOLCHAIN_PREFIX)g++
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else
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CXX := g++
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endif
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# Compiler flags: freestanding, no stdlib, kernel-mode compatible.
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override CXXFLAGS := \
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-std=gnu++20 \
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-g -O2 -pipe \
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-Wall \
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-Wextra \
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-nostdinc \
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-ffreestanding \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-PIC \
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-fno-rtti \
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-fno-exceptions \
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-ffunction-sections \
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-fdata-sections \
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-m64 \
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-march=x86-64 \
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-mno-80387 \
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-mno-mmx \
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-mno-sse \
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-mno-sse2 \
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-mno-red-zone \
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-mcmodel=small \
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-I include \
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-isystem ../kernel/freestnd-c-hdrs/x86_64/include \
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-isystem ../kernel/freestnd-cxx-hdrs/x86_64/include
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# Linker flags: freestanding static ELF.
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override LDFLAGS := \
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-nostdlib \
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-static \
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-Wl,--build-id=none \
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-Wl,--gc-sections \
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-Wl,-m,elf_x86_64 \
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-z max-page-size=0x1000 \
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-T link.ld
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# Output directory.
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BINDIR := bin
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# Discover all programs (each subdirectory under src/ is a program).
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PROGRAMS := $(notdir $(wildcard src/*))
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# Build targets: one ELF per program.
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TARGETS := $(addprefix $(BINDIR)/,$(addsuffix .elf,$(PROGRAMS)))
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.PHONY: all clean
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all: $(TARGETS)
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# Build each program from its source files.
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# For now each program is a single .cpp file compiled and linked directly.
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$(BINDIR)/%.elf: src/%/main.cpp link.ld GNUmakefile
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mkdir -p $(BINDIR) obj/$*
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$(CXX) $(CXXFLAGS) -c src/$*/main.cpp -o obj/$*/main.o
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$(CXX) $(CXXFLAGS) $(LDFLAGS) obj/$*/main.o -o $@
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clean:
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rm -rf $(BINDIR) obj
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