是什么导致Eclipse CDT无法解决的包含:< iostream> [英] What causes the Eclipse CDT Unresolved inclusion: <iostream>
问题描述
仅安装了最新的Eclipse IDE，并遵循随附的简单的应用程序已成功完成，但是一旦我进入 C ++文件教程，我收到了未解决的包含项:<iostream>"错误，以及一堆与"cout，cin，endl"有关的其他错误，因为
我完全按照指示进行了教程，并且不确定为什么会发生这种情况.此后，我已经按照此答案进行了纠正，但现在想知道为什么会发生这种情况，特别是因为我正在遵循官方教程，并且是否必须为Eclipse上的每个项目添加C ++包含路径?
注释中链接的屏幕快照中的第一个错误提供了解决该问题的线索.
如果转到错误的位置"中提到的首选项页面，则会看到有一个名为获取编译器规范的命令"的字段，其内容类似于:
${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"
这是Eclipse尝试运行的命令，以使编译器输出其内置的include路径和其他类似信息.
出现错误Program "-E" not found in PATH的事实表明变量${COMMAND}和${FLAGS}的计算结果为空字符串，因此命令中的第一个实际标记(然后，shell尝试将其解释为程序名称)为-E.
我不确定为什么这些变量的值是否为空，但是您应该可以通过将${COMMAND}替换为g++(大概是g++在您的计算机中)来解决此问题.路径).
Just installed the latest Eclipse IDE and am following the included C++ User Guide right from 'Before you begin' section.
The simple application was successfully completed but once I got to the makefile project and the C++ file tutorials, I got the "Unresolved inclusion: <iostream>" error and a bunch of others related to "cout, cin, endl" because of it.
I followed the tutorials exactly as instructed and am not sure why this occurred. I have since corrected it by following this answer, but now want to know why this happens, especially since I am following the official tutorial and do I have to add the C++ include path for every project on Eclipse?
That first error in the screenshot linked in the comments provides a clue to the problem.
If you go to the preference page mentioned in the error's "Location", you'll see that there is a field called "Command to get compiler specs" with the contents something like:
${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"
This is a command that Eclipse tries to run to get your compiler to output its built-in include paths and other similar information.
The fact that you're getting the error Program "-E" not found in PATH suggests that the variables ${COMMAND} and ${FLAGS} are evaluating to empty strings, so that the first actual token in the command (which the shell then tries to interpret as the program name) is -E.
I'm not sure why those variables are evaluating to empty, but you should be able to work around the issue by replacing ${COMMAND} with g++ (presumably g++ is in your PATH).
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