Makefile:不重新编译未更新的文件(单独的目录) [英] Makefile : do not recompile files not updated (separate directories)

问题描述

我想知道makefile怎么可能只编译带有更改的类(Java，Scala).

I wonder how it's possible for a makefile, to compile only classes (Java, Scala) with changes.

我的.scala在src目录中.当我编译时，输出(.class)进入bin目录.

My .scala are in the src directory. And when I compile, the output (.class) go to the bin directory.

在一个项目中，当您有约50个类时，每次都编译所有类太长了.

In a project, when you have ~50 classes it's too long to compile all classes each time.

您知道如何解决我的问题吗?

Do you know how to solve my problem ?

我尝试过Maven，但似乎也有同样的问题.

I tried maven but it seems to have the same problem.

我的makefile(用于Scala):

My makefile (for Scala) :

SRC = src
SOURCES = $(shell find . -name *.scala)
S = scala
SC = scalac
TARGET = bin
CP = bin

run: compile
    @echo ":: Executing..."
    @$(S) -cp $(CP) -encoding utf8 App -feature


compile: $(SOURCES:.scala=.class)

%.class: %.scala
    clear
    @echo ":: Compiling..."
    @echo "Compiling $*.scala.."
    @$(SC) -sourcepath $(SRC) -cp $(CP) -d $(TARGET) -encoding utf8 $*.scala

我找到了一个解决方案:比较.java和.bin的创建日期.这是我的文件: https://gist.github.com/Dnomyar/d01d886731ccc88d3c63 >

EDIT : I've found a solution : compare date of creation of .java and .bin. Here is my makefile : https://gist.github.com/Dnomyar/d01d886731ccc88d3c63

SRC = src
SOURCES = $(shell find ./src/ -name *.java)
S = java
SC = javac
TARGET = bin
CP = bin
VPATH=bin

run: compile
@echo ":: Executing..."
@$(S) -cp $(CP) App

compile: $(SOURCES:.%.java=.%.class)

%.class: %.java
clear
@echo ":: Compiling..."
@echo "Compiling $*.java.."
@if [ $(shell stat -c %Y $*.java) -lt $(shell stat -c %Y $(shell echo "$*.class" | sed 's/src/bin/g')) ]; then echo ; else $(SC) -sourcepath $(SRC) -cp $(CP) -d $(TARGET) -encoding utf-8 $*.java; fi




clean:
@rm -R bin/*

# Pour supprimer les fichier .fuse* créés par sublime text
fuse:
@rm `find -name "*fuse*"`

推荐答案

我找到了一个解决方案 https: //gist.github.com/Dnomyar/d01d886731ccc88d3c63 这有点难看，但似乎可以正常工作.

I've found a solution https://gist.github.com/Dnomyar/d01d886731ccc88d3c63 It's a little bit ugly but it seems to work.

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