main.cc:5:30: 致命错误: folder/file.h: 没有那个文件或目录
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main.cc:5:30: fatal error: folder/file.h: No such file or directory
提问by razorsyntax
When I use type makeinto Ubuntu terminal I get:
当我make在 Ubuntu 终端中使用 type 时，我得到：
main.cc:5:30: fatal error: folder/file.h: No such file or directory
The folder exists in the working directory and the file.h exists in the specified folder.
该文件夹存在于工作目录中，file.h 存在于指定文件夹中。
When I type lsit lists the folder and file in my working directory as well.
当我输入时，ls它也会列出我工作目录中的文件夹和文件。
Oddly enough, when I open it in geany and ask it to find the file in the
奇怪的是，当我在 geany 中打开它并要求它在
#include <folder/file.h>
it finds it without issue but when it builds it I get the error.
它发现它没有问题，但是当它构建它时我收到错误。
Is there a flag I need to set so it so it includes the folder? If so, what would that look like exactly?
是否有我需要设置的标志以便它包含文件夹？如果是这样，那会是什么样子？
回答by MadScientist
This depends a bit on your C compiler, but "typically" when you include a file using the < ... >syntax the compiler will only look for those header files in directories you have specified on the command line with the -Iflag, plus various built-in system directories.
这在一定程度上取决于您的 C 编译器，但是“通常”当您使用该< ... >语法包含一个文件时，编译器只会在您在命令行中使用该-I标志指定的目录以及各种内置系统目录中查找那些头文件.
Notably, it usually will notlook in the current working directory, unless you explicitly add -I.to the compile line.
值得注意的是，它通常不会在当前工作目录中查找，除非您明确添加-I.到编译行。
Alternatively, if you use the " ... "form of #include, then it will look in the current working directory as well.
或者，如果您使用 的" ... "形式#include，那么它也会在当前工作目录中查找。
So, either switch to #include "folder/file.h", or else add -I.to your compile line.
因此，要么切换到#include "folder/file.h"，要么添加-I.到您的编译行。
回答by rubenvb
You need to use quotes instead of <>for the include, this makes it that the compiler searches in the source file's directory first:
您需要使用引号而不是<>包含，这使得编译器首先在源文件的目录中搜索：
#include "folder/file.h"
Alternatively explicitly add the current directory to your include paths
或者，将当前目录显式添加到包含路径中
g++ c -I. main.cc
回答by How Chen
Regarding you question, I think first you need tell the compiler, where is you head file, since you write your code as:
关于您的问题，我认为首先您需要告诉编译器，您的头文件在哪里，因为您将代码编写为：
#include <folder/file.h>
I assumed that you store your file.h in $you/include/path/folder, therefore, you need pass -I ${your/include/path/}to compiler like:
我假设您将 file.h 存储在 中$you/include/path/folder，因此，您需要传递-I ${your/include/path/}给编译器，例如：
gcc -I${your/include/path/} ...
be aware, you specified in your code the include as <dir/file.h>, I think this kinds of define show following idea:
请注意，您在代码中指定了 include as <dir/file.h>，我认为这种定义显示了以下想法：
$main_include_path
|
+----folder1
|
+----folder2
|
.
.
.----folderN
Then, you can ONLY write makefileto specified the include path to it father
然后，您只能写入makefile指定其父的包含路径
