Makefile improvements - farbfeld - suckless image format with conversion tools
 (HTM) git clone git://git.suckless.org/farbfeld
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       ---
 (DIR) commit c494437937ee01c6d3eb5b630a15e207aae76c25
 (DIR) parent 3d0f4c70385c8ad1dbaad1bb266e644c7109aa6a
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Tue, 17 May 2016 23:02:25 +0200
       
       Makefile improvements
       
       - fix: rebuild on source change.
       - allow to override dependency flag per tool (the ones that have deps).
       - rebuild on config.mk or headers change.
       
       Diffstat:
         M Makefile                            |      17 ++++++++++-------
         M config.mk                           |      14 ++++++++++++++
       
       2 files changed, 24 insertions(+), 7 deletions(-)
       ---
 (DIR) diff --git a/Makefile b/Makefile
       @@ -11,17 +11,20 @@ MAN5 = farbfeld.5
        
        all: ${BIN}
        
       -png2ff ff2png:
       -        ${CC} -o $@ ${CFLAGS} ${CPPFLAGS} -L${PNGLIB} -lpng -I${PNGINC} ${LDFLAGS} $@.c
       +${BIN}: ${@:=.o}
        
       -jpg2ff ff2jpg:
       -        ${CC} -o $@ ${CFLAGS} ${CPPFLAGS} -L${JPGLIB} -ljpeg -I${JPGINC} ${LDFLAGS} $@.c
       +OBJ = ${SRC:.c=.o}
        
       -.c:
       -        ${CC} -o $@ ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} $<
       +${OBJ}: config.mk ${HDR}
       +
       +.o:
       +        ${CC} ${CFLAGS} ${$*-LDFLAGS} -o $@ $<
       +
       +.c.o:
       +        ${CC} ${CFLAGS} ${$*-CFLAGS} ${CPPFLAGS} -c $<
        
        clean:
       -        rm -f ${BIN}
       +        rm -f ${BIN} ${OBJ}
        
        dist:
                rm -rf "farbfeld-${VERSION}"
 (DIR) diff --git a/config.mk b/config.mk
       @@ -23,3 +23,17 @@ LDFLAGS  = -s ${LIBS}
        
        # compiler and linker
        CC = cc
       +
       +# flags per tool.
       +
       +png2ff-CFLAGS := -I${PNGINC}
       +png2ff-LDFLAGS := -L${PNGLIB} -lpng
       +
       +ff2png-CFLAGS := -I${PNGINC}
       +ff2png-LDFLAGS := -L${PNGLIB} -lpng
       +
       +jpg2ff-CFLAGS := -I${JPGINC}
       +jpg2ff-LDFLAGS := -L${JPGLIB} -ljpeg
       +
       +ff2jpg-CFLAGS := -I${JPGINC}
       +ff2jpg-LDFLAGS := -L${JPGLIB} -ljpeg