Netbeans Ant build.compiler.emacs

Netbeans中的默认ant设置将属性

build.compiler.emacs

设置为

true

。这是什么意思？ant文档只是说

启用与emacs兼容的错误消息

---

我知道emacs是一个编辑器，尽管我没有使用过它。将此属性设置为true或false会产生什么影响？

您可能没有注意到描述javac任务的部分在“Jikes注释”中。这是一种在使用编译器时修改编译结果消息格式的设置，当Emacs编辑器调用ant时（例如，在使用时），编辑器可以解析结果消息并在与消息相关的文件中的正确位置跳转

NB包含了这样一个编译器设置，这确实有点奇怪，它不是标准的，而且似乎已经被抛弃了近十年

给定以下ant

build.xml

文件

当您通过将

build.compiler.emacs

属性更改为

on

获得此输出时：

Buildfile: /Users/seb/projets/java/ant/build.xml

compile:
    [javac] Compiling 1 source file to /Users/seb/projets/java/ant
    [javac] Hello.java:5:52:5:54: Semantic Error: No accessible field named "foo" was found in type "Hello".

BUILD FAILED
/Users/seb/projets/java/ant/build.xml:5: Compile failed; see the compiler error output for details.

Total time: 1 second

在后一个版本中，消息没有那么新奇，Emacs更能解析它们

Buildfile: /Users/seb/projets/java/ant/build.xml

compile:
    [javac] Compiling 1 source file to /Users/seb/projets/java/ant
    [javac] 
    [javac] Found 1 semantic error compiling "Hello.java":
    [javac] 
    [javac]      5.                 System.out.println("Hello, World!"+foo);
    [javac]                                                            ^-^
    [javac] *** Semantic Error: No accessible field named "foo" was found in type "Hello".

BUILD FAILED
/Users/seb/projets/java/ant/build.xml:5: Compile failed; see the compiler error output for details.

Total time: 1 second

Buildfile: /Users/seb/projets/java/ant/build.xml

compile:
    [javac] Compiling 1 source file to /Users/seb/projets/java/ant
    [javac] Hello.java:5:52:5:54: Semantic Error: No accessible field named "foo" was found in type "Hello".

BUILD FAILED
/Users/seb/projets/java/ant/build.xml:5: Compile failed; see the compiler error output for details.

Total time: 1 second