############################################################-*-Makefile-*-####
# JC - Compile Java Files
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# $Id$

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# Usage
#
#   make jc [target=<target>] {<VARIABLE>=<value>}
#
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# Variables
#
# JC_COMPILER		 = compiler name, for example JAVAC
# $(JC_COMPILER)	 = compiler command
# $(JC_COMPILER)_FLAGS	 = compiler-specific compilation flags
# JC_FLAGS		+= compilation flags
# JC_CLASSPATH		 = location of user class files
# JC_SOURCEPATH		 = location of input source files
# JC_BOOTCLASSPATH	 = location of bootstrap class files
# JC_EXTDIRS		 = location of installed extensions
# JC_OUTPUTDIR		 = directory where to place generated class files
# JC_ENCODING		 = character encoding used by source files
# JC_SOURCE		 = version of source code
# JC_TARGET		 = version of target bytecode
# JC_FILES		+= files to compile
#
# All variables may have target specific values which override the
# normal value. Those values are specified by variables whose name is
# prefixed with the target name. For example, to override the value of
# the variable JC_CLASSPATH with target COMPILER, one may define the
# variable COMPILER_JC_CLASSPATH.
#
##############################################################################
# Examples
#
# Compile file "sources/scalac/Main.java"
#
#   make jc JC_FILES=sources/scalac/Main.java
#
#
# Compile the whole runtime
#
#   make jc target=RUNTIME
#
#
# A Makefile rule that compiles all modified files from the runtime
#
#   .latest-runtime		: $(RUNTIME_JC_FILES)
#           @$(MAKE) jc target=RUNTIME RUNTIME_JC_FILES='$?'
#           touch $@
#
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##############################################################################
# Defaults

JC_COMPILER		?= JAVAC
CYGWIN_PATH		?= $(1)
CYGWIN_FILE		?= $(1)
JAVAC			?= javac

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# Values

jc_COMPILER		 = $(call JC_LOOKUP,JC_COMPILER)
jc_compiler		 = $(call JC_LOOKUP,$(jc_COMPILER))
jc_compiler_flags	 = $(call JC_LOOKUP,$(jc_COMPILER)_FLAGS)
jc_FLAGS		 = $(call JC_LOOKUP,JC_FLAGS)
jc_CLASSPATH		 = $(call JC_LOOKUP,JC_CLASSPATH)
jc_SOURCEPATH		 = $(call JC_LOOKUP,JC_SOURCEPATH)
jc_BOOTCLASSPATH	 = $(call JC_LOOKUP,JC_BOOTCLASSPATH)
jc_EXTDIRS		 = $(call JC_LOOKUP,JC_EXTDIRS)
jc_OUTPUTDIR		 = $(call JC_LOOKUP,JC_OUTPUTDIR)
jc_ENCODING		 = $(call JC_LOOKUP,JC_ENCODING)
jc_SOURCE		 = $(call JC_LOOKUP,JC_SOURCE)
jc_TARGET		 = $(call JC_LOOKUP,JC_TARGET)
jc_FILES		 = $(call JC_LOOKUP,JC_FILES)

##############################################################################
# Command

jc			+= $(jc_compiler)
jc			+= $(jc_compiler_flags)
jc			+= $(jc_FLAGS)
jc			+= $(jc_CLASSPATH:%=-classpath $(call CYGWIN_PATH,%))
jc			+= $(jc_SOURCEPATH:%=-sourcepath $(call CYGWIN_PATH,%))
jc			+= $(jc_BOOTCLASSPATH:%=-bootclasspath $(call CYGWIN_PATH,%))
jc			+= $(jc_EXTDIRS:%=-extdirs $(call CYGWIN_PATH,%))
jc			+= $(jc_OUTPUTDIR:%=-d $(call CYGWIN_FILE,%))
jc			+= $(jc_ENCODING:%=-encoding %)
jc			+= $(jc_SOURCE:%=-source %)
jc			+= $(jc_TARGET:%=-target %)
jc			+= $(jc_FILES:%=$(call CYGWIN_FILE,'%'))

##############################################################################
# Functions

JC_LOOKUP		 = $(if $($(target)_$(1)),$($(target)_$(1)),$($(1)))

##############################################################################
# Rules

jc		:
	@[ -d "$(jc_OUTPUTDIR)" ] || $(MKDIR) -p "$(jc_OUTPUTDIR)"
	$(strip $(jc))

.PHONY		: jc

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