# -*- makefile -*-

SHELL = /bin/sh

VPATH = $(SRCDIR)

# Binary utilities.
# If the host appears to be x86, use the normal tools.
# If it's x86-64, use the compiler and linker in 32-bit mode.
# Otherwise assume cross-tools are installed as i386-elf-*.
X86 = i.86\|pentium.*\|[pk][56]\|nexgen\|viac3\|6x86\|athlon.*\|i86pc
X86_64 = x86_64
ifneq (0, $(shell expr `uname -m` : '$(X86)'))
  CC = gcc
  LD = ld
  OBJCOPY = objcopy
else
  ifneq (0, $(shell expr `uname -m` : '$(X86_64)'))
    CC = gcc -m32
    LD = ld -melf_i386
    OBJCOPY = objcopy
  else
    CC = i386-elf-gcc
    LD = i386-elf-ld
    OBJCOPY = i386-elf-objcopy
  endif
endif

# by default randomizing static libraries can be done using the host compiler
RANLIB = ranlib

# macOS: force compiling with the i686-elf cross compiler suite
UNAME_S = $(shell uname -s)
ifeq ($(UNAME_S),Darwin)
  CC = i686-elf-gcc
  LD = i686-elf-ld
  OBJCOPY = i686-elf-objcopy
  RANLIB = i686-elf-ranlib
endif

ifeq ($(strip $(shell command -v $(CC) 2> /dev/null)),)
$(warning *** Compiler ($(CC)) not found.  Did you set $$PATH properly?  Please refer to the Getting Started section in the documentation for details. ***)
endif

# Compiler and assembler invocation.
DEFINES =
WARNINGS = -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Wsystem-headers -Wno-frame-address
CFLAGS = -g -msoft-float -O -fno-omit-frame-pointer -ffreestanding -fno-pic -fcommon -mno-sse
CPPFLAGS = -nostdinc -I$(SRCDIR) -I$(SRCDIR)/lib
ASFLAGS = -Wa,--gstabs
LDFLAGS = 
DEPS = -MMD -MF $(@:.o=.d)

# Turn off -fstack-protector, which we don't support.
ifeq ($(strip $(shell echo | $(CC) -fno-stack-protector -E - > /dev/null 2>&1; echo $$?)),0)
CFLAGS += -fno-stack-protector
endif

# Turn off --build-id in the linker, which confuses the PintOS loader.
ifeq ($(strip $(shell $(LD) --help | grep -q build-id; echo $$?)),0)
LDFLAGS += -Wl,--build-id=none
endif

%.o: %.c
	$(CC) -c $< -o $@ $(CFLAGS) $(CPPFLAGS) $(WARNINGS) $(DEFINES) $(DEPS)

%.o: %.S
	$(CC) -c $< -o $@ $(ASFLAGS) $(CPPFLAGS) $(DEFINES) $(DEPS)
