##################################################
#Desc:   C Compiler Setup
#Author: Mihrtec LLC
#Date:   2016
##################################################
#Included from ./build.mk
#Defines variables used in the make process to
#compile C files either to native bc through gcc,
#or web through emscripten
##################################################
#Manually defined resources
##################################################
#Libraries to link for the build
CLIBS    := wolfssl SDL2 SDL2_image SDL2_ttf
#Modules for C (directories in src/ with C code)
CMODULES := $(APPMODULE)
#CFlag defaults
CFLAGS   := -Wall


##################################################
#Allow compiler-specific and OS-specific
#makefiles to override C environment vars
##################################################
-include .make/buildc_$(strip $(notdir $(CC))).mk
ifdef OS
-include .make/buildc_$(strip $(OS)).mk
endif

#Link each CLIB with -l
CFLAGS += $(patsubst %,-l%,$(CLIBS))
#Include each module's root directory and .
CFLAGS += $(patsubst %,-I%, $(CMODULES)) -I.
#C Preprocessor defines
CFLAGS += -DAPPNAME=$(APPNAME)

##################################################
#Conditional (may be set in buildc_*.mk files)
##################################################
#Sources are found in any CMODULE subdir
CSRC     ?= $(wildcard $(patsubst %,%/*.c,$(CMODULES)))
#Output format suffix
COBJSUF  ?= .o
#Architecture
CARCH    ?= $(shell uname -m)
#Application suffix
APPSUF   ?= .$(CARCH)
#C binary distribution directory
CDISTDIR ?= $(DISTDIR)
#Directory for C binary/executable output files
CBINDIR  ?= $(CDISTDIR)/bin
#Set up the final C build targets
CTARG    ?= $(CSRC:.c=$(COBJSUF))

#Set of shell functions used to determine dependencies
#for building each c source file
#$BASE is a keyword replaced in the main Makefile iteratively
#for each source file.
CDPIPE ?= $(strip $(CC)) -MM -MG $(CXXFLAXS) $(CFLAGS) $BASE.c
CDSED  ?= sed -e 's@^.*\.o:@@'
CDTR   ?= tr '\\' ' '
#The shell command to execute and evaluate for deps
CDEPSCOMMAND ?= $(CDPIPE) | $(CDSED) | $(CDTR)

#Set of shell functions used to determine the
#name of each library the compiler/LD can't find
LDPIPE ?= $(CC) $(patsubst %,-l%,$(CLIBS)) 2>&1 >/dev/null
LDGREP ?= grep "cannot find"
LDSED  ?= sed -e 's@^.*cannot find -l\([a-zA-Z0-9\.]*\).*@\1@g'
#Calculate missing libs
MISSINGLIBS ?= $(strip $(shell $(LDPIPE) | $(LDGREP) | $(LDSED)))

#Include handler for building missing libs, if any
ifdef MISSINGLIBS
include .make/buildclibs.mk
endif