MACHINE := $(shell $(CC) -dumpmachine || echo unknown)

STATIC ?= 1
STRIP  ?= 1

ifneq (,$(firstword $(filter x86_64-%,$(MACHINE))))
  MARCH ?= x86-64
  MTUNE ?= znver3
else
  ifneq (,$(firstword $(filter i686-%,$(MACHINE))))
    MARCH ?= i586
    MTUNE ?= pentium2
  endif
endif

CFLAGS = -Wall -std=gnu99 -pedantic -Ofast -DNDEBUG

ifneq (,$(XCFLAGS))
  CFLAGS += $(XCFLAGS)
endif

ifneq (,$(MARCH))
  CFLAGS += -march=$(MARCH)
endif
ifneq (,$(MTUNE))
  CFLAGS += -mtune=$(MTUNE)
endif

ifneq (,$(firstword $(filter %mingw32 %-windows-gnu %-cygwin %-cygnus,$(MACHINE))))
  OUTNAME := crc64.exe
else
  OUTNAME := crc64
endif

ifneq (,$(firstword $(filter %-w64-mingw32 %w64-windows-gnu,$(MACHINE))))
  CFLAGS += -mconsole -municode
endif

ifeq ($(STATIC),1)
  CFLAGS += -static
endif

ifeq ($(STRIP),1)
  CFLAGS += -s
endif

.PHONY: all

all:
	$(CC) $(CFLAGS) -o $(OUTNAME) crc64.c