116 lines
2.9 KiB
Makefile
116 lines
2.9 KiB
Makefile
# Makefile for shared libc static library on MontaukOS
|
|
# Copyright (c) 2025-2026 Daniel Hammer
|
|
|
|
MAKEFLAGS += -rR
|
|
.SUFFIXES:
|
|
|
|
# ---- Toolchain ----
|
|
|
|
TOOLCHAIN_PREFIX := $(shell cd ../../.. && pwd)/toolchain/local/bin/x86_64-montauk-
|
|
ifneq ($(wildcard $(TOOLCHAIN_PREFIX)gcc),)
|
|
CC := $(TOOLCHAIN_PREFIX)gcc
|
|
AR := $(TOOLCHAIN_PREFIX)ar
|
|
LD := $(TOOLCHAIN_PREFIX)ld
|
|
else
|
|
CC := gcc
|
|
AR := ar
|
|
LD := ld
|
|
endif
|
|
|
|
# ---- Paths ----
|
|
|
|
LIBC_INC := ../../include/libc
|
|
OBJDIR := obj
|
|
CRTDIR := crt
|
|
ASM_OBJS := $(OBJDIR)/setjmp.o
|
|
|
|
# ---- Compiler flags ----
|
|
|
|
CFLAGS := \
|
|
-std=gnu11 \
|
|
-g -O2 -pipe \
|
|
-Wall \
|
|
-Wno-unused-parameter \
|
|
-nostdinc \
|
|
-ffreestanding \
|
|
-fno-stack-protector \
|
|
-fno-stack-check \
|
|
-fno-PIC \
|
|
-ffunction-sections \
|
|
-fdata-sections \
|
|
-m64 \
|
|
-march=x86-64 \
|
|
-msse \
|
|
-msse2 \
|
|
-mno-red-zone \
|
|
-mcmodel=small \
|
|
-isystem $(LIBC_INC) \
|
|
-isystem $(shell $(CC) -print-file-name=include)
|
|
|
|
CRT_CFLAGS := \
|
|
-std=gnu11 \
|
|
-O2 \
|
|
-nostdinc \
|
|
-ffreestanding \
|
|
-fno-stack-protector \
|
|
-fno-stack-check \
|
|
-fno-PIC \
|
|
-m64 \
|
|
-march=x86-64 \
|
|
-mno-red-zone \
|
|
-fno-tree-loop-distribute-patterns \
|
|
-isystem $(LIBC_INC) \
|
|
-isystem $(shell $(CC) -print-file-name=include)
|
|
|
|
# ---- Target ----
|
|
|
|
TARGET := liblibc.a
|
|
SDK_TARGET := liblibc-full.a
|
|
CRT_OBJS := crt1.o crti.o crtn.o
|
|
|
|
.PHONY: all clean
|
|
|
|
all: $(TARGET) $(SDK_TARGET) $(CRT_OBJS)
|
|
|
|
# printf_float.o is deliberately a SEPARATE archive member: a weak undefined
|
|
# reference does not extract an archive member, so programs that never format
|
|
# a float leave the decimal-conversion and pow/exp/log code behind. Programs
|
|
# that do need %e/%f/%g must link with -Wl,-u,_pf_putfloat to force it in.
|
|
$(TARGET): $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o $(ASM_OBJS)
|
|
$(AR) rcs $@ $^
|
|
|
|
$(OBJDIR)/libc.o: libc.c printf_internal.h Makefile
|
|
@mkdir -p $(OBJDIR)
|
|
$(CC) $(CFLAGS) -c $< -o $@
|
|
|
|
$(OBJDIR)/printf_float.o: printf_float.c printf_internal.h Makefile
|
|
@mkdir -p $(OBJDIR)
|
|
$(CC) $(CFLAGS) -c $< -o $@
|
|
|
|
$(OBJDIR)/setjmp.o: setjmp.S Makefile
|
|
@mkdir -p $(OBJDIR)
|
|
$(CC) $(CFLAGS) -c $< -o $@
|
|
|
|
# Variant shipped in the on-OS sysroots (0:/sdk/lib/libc.a and tcc's), where
|
|
# nobody can pass -Wl,-u,_pf_putfloat by hand. `ld -r` binds vsnprintf's weak
|
|
# reference to the float module at merge time, so %e/%f/%g just work for code
|
|
# compiled ON MontaukOS. Function-level --gc-sections still applies to the
|
|
# rest; only the float path is pinned. Image size is not a concern here.
|
|
$(SDK_TARGET): $(OBJDIR)/libc-merged.o $(ASM_OBJS)
|
|
$(AR) rcs $@ $^
|
|
|
|
$(OBJDIR)/libc-merged.o: $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o
|
|
$(LD) -r -o $@ $(OBJDIR)/libc.o $(OBJDIR)/printf_float.o
|
|
|
|
crt1.o: $(CRTDIR)/crt1.c Makefile
|
|
$(CC) $(CRT_CFLAGS) -c $< -o $@
|
|
|
|
crti.o: $(CRTDIR)/crti.c Makefile
|
|
$(CC) $(CRT_CFLAGS) -c $< -o $@
|
|
|
|
crtn.o: $(CRTDIR)/crtn.c Makefile
|
|
$(CC) $(CRT_CFLAGS) -c $< -o $@
|
|
|
|
clean:
|
|
rm -rf $(OBJDIR) $(TARGET) $(SDK_TARGET) $(CRT_OBJS)
|