115 lines
3.0 KiB
Makefile
115 lines
3.0 KiB
Makefile
# Makefile for shared libc static library on MontaukOS
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# Copyright (c) 2025-2026 Daniel Hammer
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MAKEFLAGS += -rR
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.SUFFIXES:
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# ---- Toolchain ----
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include ../../mk/arch.mk
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ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
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CC := $(TOOLCHAIN_PREFIX)gcc
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AR := $(TOOLCHAIN_PREFIX)ar
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LD := $(TOOLCHAIN_PREFIX)ld
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else
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CC := gcc
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AR := ar
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LD := ld
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endif
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# ---- Paths ----
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LIBC_INC := ../../include/libc
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OBJDIR := obj$(ARCH_SUFFIX)
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CRTDIR := crt
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ASM_OBJS := $(OBJDIR)/setjmp.o
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# ---- Compiler flags ----
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CFLAGS := \
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-std=gnu11 \
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-g -O2 -pipe \
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-Wall \
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-Wno-unused-parameter \
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-nostdinc \
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-ffreestanding \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-PIC \
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-ffunction-sections \
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-fdata-sections \
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$(ARCH_CFLAGS) \
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$(ARCH_FP_FLAGS) \
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-isystem $(LIBC_INC) \
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-isystem $(shell $(CC) -print-file-name=include)
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CRT_CFLAGS := \
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-std=gnu11 \
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-O2 \
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-nostdinc \
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-ffreestanding \
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-fno-stack-protector \
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-fno-stack-check \
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-fno-PIC \
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$(ARCH_CFLAGS) \
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-fno-tree-loop-distribute-patterns \
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-isystem $(LIBC_INC) \
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-isystem $(shell $(CC) -print-file-name=include)
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# ---- Target ----
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TARGET := $(ARCH_OUT)liblibc.a
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SDK_TARGET := $(ARCH_OUT)liblibc-full.a
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CRT_OBJS := $(ARCH_OUT)crt1.o $(ARCH_OUT)crti.o $(ARCH_OUT)crtn.o
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.PHONY: all clean
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all: $(TARGET) $(SDK_TARGET) $(CRT_OBJS)
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# printf_float.o is deliberately a SEPARATE archive member: a weak undefined
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# reference does not extract an archive member, so programs that never format
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# a float leave the decimal-conversion and pow/exp/log code behind. Programs
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# that do need %e/%f/%g must link with -Wl,-u,_pf_putfloat to force it in.
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$(TARGET): $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o $(ASM_OBJS)
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@mkdir -p $(dir $@)
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$(AR) rcs $@ $^
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$(OBJDIR)/libc.o: libc.c printf_internal.h Makefile
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@mkdir -p $(OBJDIR)
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$(CC) $(CFLAGS) -c $< -o $@
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$(OBJDIR)/printf_float.o: printf_float.c printf_internal.h Makefile
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@mkdir -p $(OBJDIR)
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$(CC) $(CFLAGS) -c $< -o $@
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$(OBJDIR)/setjmp.o: arch/setjmp-$(ARCH).S Makefile
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@mkdir -p $(OBJDIR)
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$(CC) $(CFLAGS) -c $< -o $@
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# Variant shipped in the on-OS sysroots (0:/sdk/lib/libc.a and tcc's), where
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# nobody can pass -Wl,-u,_pf_putfloat by hand. `ld -r` binds vsnprintf's weak
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# reference to the float module at merge time, so %e/%f/%g just work for code
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# compiled ON MontaukOS. Function-level --gc-sections still applies to the
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# rest; only the float path is pinned. Image size is not a concern here.
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$(SDK_TARGET): $(OBJDIR)/libc-merged.o $(ASM_OBJS)
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@mkdir -p $(dir $@)
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$(AR) rcs $@ $^
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$(OBJDIR)/libc-merged.o: $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o
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$(LD) -r -o $@ $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o
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$(ARCH_OUT)crt1.o: $(CRTDIR)/crt1.c Makefile
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@mkdir -p $(dir $@)
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$(CC) $(CRT_CFLAGS) -c $< -o $@
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$(ARCH_OUT)crti.o: $(CRTDIR)/crti.c Makefile
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@mkdir -p $(dir $@)
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$(CC) $(CRT_CFLAGS) -c $< -o $@
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$(ARCH_OUT)crtn.o: $(CRTDIR)/crtn.c Makefile
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@mkdir -p $(dir $@)
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$(CC) $(CRT_CFLAGS) -c $< -o $@
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clean:
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rm -rf $(OBJDIR) $(TARGET) $(SDK_TARGET) $(CRT_OBJS)
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