Build: add support for several programs in 'src' that possibly share the c++ modules

To define program for compile and flash use shell or make var TARGET (local.conf, or Makefile.conf)

Makefile.conf

@@ -1,7 +1,7 @@
 HERE:=$(dir $(lastword $(MAKEFILE_LIST)))
 
 # Project Name
-TARGET = Blink
+TARGET?=perkons
 
 # Configure for debugging
 # common configurations:

build.conf.example

@@ -1,6 +1,10 @@
 # Build config
 # also, infos for the build system about the dev environment
 
+# The program to compile and flash
+# the name of the main cxx file without the prefix 'main_'
+TARGET=perkons
+
 DEBUG=0
 
 # Daisy dependencies Relative to dir 'src'

src/Makefile

@@ -1,6 +1,15 @@
 include ../Makefile.conf
 
-CXX_SRC=$(wildcard *.cc)
+ALL_SRC=$(wildcard *.cc)
+TARGET_SRC=main_$(TARGET).cc
+MODULES_SRC=$(filter-out main_%,$(ALL_SRC))
+CXX_SRC=$(MODULES_SRC) $(TARGET_SRC)
+
+$(info CXXFLAGS: $(CXXFLAGS))
+$(info SOURCES: $(ALL_SRC))
+$(info MODULES: $(MODULES_SRC))
+$(info TARGET_SRC: $(TARGET_SRC))
+$(info CXX_SRC: $(CXX_SRC))
 
 # libDaisy Makefile variables
 SYSTEM_FILES_DIR=$(LIBDAISY_DIR)/core