C++ 编译错误：“stddef.h：没有那个文件或目录”
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Compilation error: "stddef.h: No such file or directory"
提问by Louie
Whenever I try to compile this code it always ends up with this error:
每当我尝试编译这段代码时，它总是以这个错误告终：
In file included from /usr/include/wchar.h:6:0,
from /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/cwchar:44,
from /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/bits/postypes.h:40,
from /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/iosfwd:40,
from /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/ios:38,
from /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/ostream:38,
from /usr/lib/gcc/i686-pc-cygwin/4.9.2/include/c++/iostream:39,
from test.cpp:1:
/usr/include/sys/reent.h:14:20: fatal error: stddef.h: No such file or directory
#include <stddef.h>
^
compilation terminated.
The code I was trying to compile is:
我试图编译的代码是：
#include <iostream>
using namespace std;
int main()
{
cout << "Hello World! :D";
return 0;
}
回答by ThisIzKp
The error is because your gcc-core package and gcc-g++ are not of the same version. Either downgrade one of them to solve the problem or update both the libraries. Updating both the libraries is the recommended way.
错误是因为您的 gcc-core 包和 gcc-g++ 不是同一版本。要么降级其中一个以解决问题，要么更新两个库。更新这两个库是推荐的方式。
回答by Ben
I had this error on a fresh MinGW install, it had nothing to do with the installed packages mentioned in the current accepted answer by "Prasanth Karri". In my case the issue was caused by -nostdincin my Makefile. I actually only needed that compiler flag when building for a different target platform (not when using MinGW) so I fixed the issue by removing that flag from MinGW builds.
我在新的 MinGW 安装中遇到了这个错误，它与“Prasanth Karri”当前接受的答案中提到的已安装软件包无关。在我的情况下，问题是由-nostdinc我的 Makefile引起的。我实际上只在为不同的目标平台构建时（而不是在使用 MinGW 时）需要该编译器标志，所以我通过从 MinGW 构建中删除该标志来解决这个问题。
回答by Gilrain
When I was incorporating a software library written in C into an existing demo project(used a C++ mbed library) I encountered this problem. The demo project would compile just fine, but after I replaced the existing main file by my own, this error occurred.
当我将用 C 编写的软件库合并到现有的演示项目（使用 C++ mbed 库）时，我遇到了这个问题。演示项目可以编译得很好，但是在我自己替换了现有的主文件后，出现了这个错误。
At this point I hadn't yet thought about the fact that the mbed library that I needed was written in C++. My own main file was a .c file that #includethe mbed header file. As a result I used my normal C source as if it was a C++ source. Therefore the compiler that was used to compile my main file was the C compiler.
This C compiler then encountered a #includeof a module that actually does not exist(within its scope), as it's not a C++ compiler.
在这一点上，我还没有想到我需要的 mbed 库是用 C++ 编写的。我自己的主文件是#includembed 头文件的 .c文件。结果我使用了我的普通 C 源代码，就好像它是一个 C++ 源代码一样。因此，用于编译我的主文件的编译器是C 编译器。这个 C 编译器然后遇到了#include一个实际上不存在的模块（在它的范围内），因为它不是一个 C++ 编译器。
Only after I inspected the output of the build log I realised the various source C and C++ files were compiled by more that 1 compiler(the c++ compiler). The project used used compilers arm-none-eabi-c++ and arm-none-eabi-gcc (for embedded systems) as seen below.
只有在我检查了构建日志的输出后，我才意识到各种源 C 和 C++ 文件是由超过 1 个编译器（C++ 编译器）编译的。该项目使用了编译器 arm-none-eabi-c++ 和 arm-none-eabi-gcc（用于嵌入式系统），如下所示。
Compile log:
编译日志：
Building file: ../anyfile.cpp
Invoking: MCU C++ Compiler
arm-none-eabi-c++ <A lot of arguments> "../anyfile.cpp"
Finished building: ../anyfile.cpp
Building file: ../main.c
Invoking: MCU C Compiler
arm-none-eabi-gcc <A lot of arguments> "../main.c"
In file included from <Project directory>\mbed/mbed.h:21:0,
from ../main.c:16:
<Project directory>\mbed/platform.h:25:19: fatal error: cstddef: No such file or directory
compilation terminated.
Of course in a C++ environment cstddef exists, but in a C environment cstddef doesn't exist, in stead it's just C's implementation of stddef.
当然，在 C++ 环境中cstddef 存在，但在 C 环境中 cstddef 不存在，它只是 C 对 stddef 的实现。
In other words, cstddef does not exist in the C compiler. I resolved this problem by renaming my main.c file to main.cpp and the rest of the code compiled smoothly too.
换句话说，C 编译器中不存在 cstddef。我通过将 main.c 文件重命名为 main.cpp 解决了这个问题，其余代码也顺利编译。
TLDR/Conclusion: When building a C++ project, avoid mixing C files with C++ files(sources and headers). If possible rename .c files to .cppfiles to use the C++ compiler in stead of the C compiler where required.
TLDR/结论：在构建 C++ 项目时，避免将 C 文件与 C++ 文件（源代码和头文件）混合。如果可能，将 .c 文件重命名为 .cpp文件以在需要时使用 C++ 编译器而不是 C 编译器。
回答by Yonina Ab
If you try to compile and see a message like, "fatal error: stddef.h: No such file or directory", the error is because your gcc-core and gcc-g++ packages are not of the same version. Rerun the Cygwin install and make sure that you select the highest numbered versions of gcc-core and gcc-g++.
如果您尝试编译并看到类似“致命错误：stddef.h：没有这样的文件或目录”的消息，则该错误是因为您的 gcc-core 和 gcc-g++ 软件包的版本不同。重新运行 Cygwin 安装并确保您选择 gcc-core 和 gcc-g++ 的最高编号版本。
回答by Ankit Tamboli
This problem was solved for me as I installed codeblockswith mingw compiler then I copied the mingw folder from codeblocks to C drive and added
C\mingw\binto the environment variables.
当我安装codeblocks了 mingw 编译器时，这个问题为我解决了，然后我将 mingw 文件夹从代码块复制到 C 驱动器并添加
C\mingw\bin到环境变量中。
