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#
# common/Makefile.c-common - Common Makefile items for C
#
# Written 2013-2016 by Werner Almesberger
# Copyright 2013-2016 by Werner Almesberger
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#

SHELL = /bin/bash


OBJ_SUFFIX ?= .o

# Make sure "all" comes first

all::

# ----- YACC settings ---------------------------------------------------------

YACC = bison -y
YYFLAGS = -v

# ----- Verbosity control -----------------------------------------------------

CC_normal	:= $(CC)
AS_normal	:= $(AS)
CPP_normal	:= $(CPP)
LEX_normal	:= $(LEX)
YACC_normal	:= $(YACC)
DEPEND_normal	= $(CPP_normal) $(CFLAGS) -MM -MG

ifeq ($(V),1)
    CC		= $(CC_normal)
    AS		= $(AS_normal)
    LEX		= $(LEX_normal)
    YACC	= $(YACC_normal)
    BUILD	=
    DEPEND	= $(DEPEND_normal)
else
    CC		= @echo "  CC       " $@ && $(CC_normal)
    AS		= @echo "  AS       " $@ && $(AS_normal)
    LEX		= @echo "  LEX      " $@ && $(LEX_normal)
    YACC	= @echo "  YACC     " $@ && $(YACC_normal)
    BUILD	= @echo "  BUILD    " $@ &&
    DEPEND	= @$(DEPEND_normal)
endif

# ----- Dependencies ----------------------------------------------------------

-include $(OBJS:$(OBJ_SUFFIX)=.d)

MKDEP =									\
	$(DEPEND) $< |							\
	  sed								\
	    -e 's|^$(basename $(notdir $<))\$(OBJ_SUFFIX):|$@:|'	\
	    -e '/^\(.*:\)\? */{p;s///;s/ *\\\?$$/ /;s/  */:\n/g;H;}'	\
	    -e '$${g;p;}'						\
	    -e d >$(basename $@).d;					\
	  [ "$${PIPESTATUS[*]}" = "0 0" ] ||				\
	  { rm -f $(basename $@).d; exit 1; }

#
# See
# http://stackoverflow.com/questions/5229561/gnu-make-generating-automatic-dependencies-with-generated-header-files
#

.PHONY:		generated_headers

%$(OBJ_SUFFIX):	%.c | generated_headers
		$(CC) $(CFLAGS) -c -o $@ $<
		$(MKDEP)

# ----- Cleanup ---------------------------------------------------------------

clean::
		rm -f $(OBJS) $(OBJS:$(OBJ_SUFFIX)=.d)