Clang windows iostream file not found

I followed this tutorial (here) to get Clang working on windows. I choose the path to install clang in combination with msys2.

After following all instructions I wrote the simple programme:

#include <iostream>
using namespace std;

int main()
{   
cout<<"Hello, World!\n";
return 0;
}

After compiling with:
clang++ Helloworld.cpp -o Helloworld.exe -std=c++14

I get the error:

*Helloworld.cpp:2:10: fatal error: ‘iostream’ file not found,

1 error generated.*

Adding -v in the command line I get:

Errors

clang version 3.9.1 (tags/RELEASE_391/final) 
Target: x86_64-w64-windows-gnu
Thread model: posix
InstalledDir: C:\msys64\mingw64\bin     
"C:\\msys64\\mingw64\\bin\\clang++.exe" -cc1 -triple x86_64-w64-windows-gnu -emit-obj -mrelax-all -disable-free -disable-    llvm-verifier -discard-value-names -main-file-name Helloworld.cpp -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -momit-leaf-frame-pointer -v -dwarf-column-info -debugger-tuning=gdb -resource-dir "C:\\msys64\\mingw64\\bin\\..\\lib\\clang\\3.9.1" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include\\c++" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include\\c++\\x86_64-w64-mingw32" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include\\c++\\backward" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include\\c++\\" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include\\c++\\\\x86_64-w64-mingw32" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include\\c++\\\\backward" -internal-isystem "C:\\msys64\\mingw64\\include\\c++\\" -internal-isystem "C:\\msys64\\mingw64\\include\\c++\\\\x86_64-w64-mingw32" -internal-isystem "C:\\msys64\\mingw64\\include\\c++\\\\backward" -internal-isystem "include\\c++" -internal-isystem "include\\c++\\x86_64-w64-mingw32" -internal-isystem "include\\c++\\backward" -internal-isystem "C:\\msys64\\mingw64\\bin\\..\\lib\\clang\\3.9.1\\include" -internal-isystem "C:\\msys64\\mingw64\\x86_64-w64-mingw32\\include" -internal-isystem "C:\\msys64\\mingw64\\include" -std=c++14 -fdeprecated-macro -fdebug-compilation-dir "C:\\msys64\\programming" -ferror-limit 19 -fmessage-length 0 -femulated-tls -fno-use-cxa-atexit -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -o "C:\\msys64\\tmp\\Helloworld-2393e7.o" -x c++ Helloworld.cpp

clang -cc1 version 3.9.1 based upon LLVM 3.9.1 default target x86_64-w64-windows-gnu
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include\c++"
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include\c++\x86_64-w64-mingw32"
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include\c++\backward"
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include\c++\"
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include\c++\\x86_64-w64-mingw32"
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include\c++\\backward"
ignoring nonexistent directory "C:\msys64\mingw64\include\c++\"
ignoring nonexistent directory "C:\msys64\mingw64\include\c++\\x86_64-w64-mingw32"
ignoring nonexistent directory "C:\msys64\mingw64\include\c++\\backward"
ignoring nonexistent directory "include\c++"
ignoring nonexistent directory "include\c++\x86_64-w64-mingw32"
ignoring nonexistent directory "include\c++\backward"
ignoring nonexistent directory "C:\msys64\mingw64\x86_64-w64-mingw32\include"
#include "..." search starts here:
#include <...> search starts here:
 C:\msys64\mingw64\bin\..\lib\clang\3.9.1\include
 C:\msys64\mingw64\include
End of search list.
Helloworld.cpp:2:10: fatal error: 'iostream' file not found
#include <iostream>
         ^
1 error generated.

How do I get the system to find iostream? I read something about,that you have to point to the mingw headers in clang/lib/Frontend/InitHeaderSearch.cpp. I couldn’t find the file InitHeaderSearch.cpp on my computer.

Thank you for your help.

Windows 8
Clang 3.9.1

asked Feb 21, 2017 at 20:26

HaijicoHaijico

511 silver badge3 bronze badges

Due to mistake in the build script some dependencies are missing.

Installing gcc package (mingw-w64-i686-gcc for 32 bit and mingw-w64-x86_64-gcc for 64 bit) will pull them.

answered Feb 26, 2017 at 15:57

mati865mati865

3813 silver badges10 bronze badges

Источник

The «fatal error: ‘iostream’ file not found» is a common issue faced by C++ developers when using Clang++ compiler. This error occurs when the Clang++ compiler is unable to locate the iostream header file, which is a standard library in C++ and provides input/output functionality. This error can be caused by a variety of factors, including incorrect paths in your include directories, missing or incorrect library files, or issues with your compiler installation.

Method 1: Check Include Directories

To fix the «Locating iostream in Clang++: fatal error: ‘iostream’ file not found» issue in C++, you can use the «Check Include Directories» option. This option allows you to specify the directories where the compiler should look for header files.

Here are the steps to fix the issue:

First, locate the directory where the iostream header file is located. This file is usually located in the «include» directory of your C++ compiler installation.
Open your IDE or text editor and locate the project settings. Look for the «Check Include Directories» option.
Add the directory where the iostream header file is located to the list of directories to be checked. You can do this by adding the following line to your project settings:

-I/path/to/iostream/directory

Make sure to replace «/path/to/iostream/directory» with the actual path to the directory where the iostream header file is located.

Save the changes to your project settings and recompile your code. The «Locating iostream in Clang++: fatal error: ‘iostream’ file not found» issue should now be resolved.

Here is an example of how to add the directory to the list of directories to be checked:

#include <iostream>

int main() {
    std::cout << "Hello, world!" << std::endl;
    return 0;
}

In this example, the iostream header file is included using the #include directive. The compiler looks for this file in the directories specified in the «Check Include Directories» option.

By following these steps, you should be able to fix the «Locating iostream in Clang++: fatal error: ‘iostream’ file not found» issue in C++.

Method 2: Check Library Files

To fix the «Locating iostream in Clang++: fatal error: ‘iostream’ file not found» error in C++, you can use the «Check Library Files» method. This method involves checking if the necessary library files are present and properly configured in your system.

Here are the steps to follow:

Check if the iostream header file is present in your system by running the following command in your terminal:

ls /usr/include/c++/v1/iostream

If the file is present, you should see the output:

/usr/include/c++/v1/iostream

If the file is not present, you need to install the necessary C++ libraries. You can do this by running the following command:

sudo apt-get install build-essential

This will install the necessary C++ libraries on your system.

Once the libraries are installed, you need to configure your system to use them. You can do this by adding the following lines to your C++ code:

#include <iostream>
using namespace std;

These lines will include the iostream header file and set the namespace to std.

Finally, you can compile your C++ code using the following command:

clang++ -std=c++11 -stdlib=libc++ -I /usr/include/c++/v1/ <your_file_name>.cpp -o <output_file_name>

This command will compile your C++ code and link it with the necessary libraries.

Here is an example code that uses the iostream header file:

#include <iostream>
using namespace std;

int main() {
    cout << "Hello, World!" << endl;
    return 0;
}

This code will print «Hello, World!» to the console.

That’s it! By following these steps, you should be able to fix the «Locating iostream in Clang++: fatal error: ‘iostream’ file not found» error in C++.

Method 3: Reinstall Compiler

To fix the issue of locating iostream in Clang++, you can try reinstalling the compiler. Here are the steps to do it:

First, uninstall the current version of Clang++ from your system.
Download the latest version of Clang++ from the official website.
Install the downloaded Clang++ on your system.
Once the installation is complete, open the terminal and type the following command to compile your C++ code:
```
clang++ -std=c++11 -stdlib=libc++ -I/usr/include/c++/v1/ <filename>.cpp -o <output_filename>
```
Note: Replace <filename> and <output_filename> with your actual file names.
If you still encounter the same error, try including the path to the iostream header file in your compile command:
```
clang++ -std=c++11 -stdlib=libc++ -I/usr/include/c++/v1/ -I/usr/include/ <filename>.cpp -o <output_filename>
```
Note: Replace /usr/include/ with the actual path to the iostream header file on your system.
If none of the above steps work, try reinstalling the entire Xcode package on your system.

This will install the latest version of Xcode, which includes Clang++.

That’s it! By reinstalling the compiler, you should be able to fix the issue of locating iostream in Clang++.

Источник

I was trying to use clangd in VSCode in my project. But clangd could not find the iostream file.

Error report:
‘iostream’ file not foundclang(pp_file_not_found)

clangd 11.0.0
Win 10

Clangd doesn’t provide a standard library, and expects to use one already installed on your system. This may require configuring with some flags, as if you were building with clang.

But we realize this is probably confusing/a hassle, particularly for windows users. Maybe we should bundle the headers. Can I ask:

do you also expect to build your project on the machine clangd is running on?
do you have a C++ compiler installed (e.g. MSVC, clang, gcc)

Thanks for @sam-mccall commend.

Yes, I expect my project would be builded with clangd running on
I’ve installed clang-x64 (no MSVC) and MinGW 64

I added INCLUDE into environment variable with value: «C:\mingw64\lib\gcc\x86_64-w64-mingw32\8.1.0\include\c++». That could direct VSCode where iostream file is. However another bug appears that VScode could not find other header files like «c++config.h». It seems like all subdirectories could not be searched. That’s really confusing.

Here is the c_cpp_properties.json

So how and where do I specify the flags so my clangd sees standard library? Somewhere in settings.json? Or CMakeLists.txt so cmake generates compilation_commands with stdlib location specified? I’m a confused windows user.

clangd —help says:

  --enable-config                 - Read user and project configuration from YAML files.
                                    Project config is from a .clangd file in the project directory.
                                    User config is from clangd/config.yaml in the following directories:
                                        Windows: %USERPROFILE%\AppData\Local
                                        Mac OS: ~/Library/Preferences/
                                        Others: $XDG_CONFIG_HOME, usually ~/.config
                                    Configuration is documented at https://clangd.llvm.org/config.html

So hopefully your answer is here.

Thanks for @sam-mccall commend.

Yes, I expect my project would be builded with clangd running on

I’ve installed clang-x64 (no MSVC) and MinGW 64

I added INCLUDE into environment variable with value: «C:\mingw64\lib\gcc\x86_64-w64-mingw32\8.1.0\include\c++». That could direct VSCode where iostream file is. However another bug appears that VScode could not find other header files like «c++config.h». It seems like all subdirectories could not be searched. That’s really confusing.

Here is the c_cpp_properties.json

I meet the same problem. Do you have resolved your problem?

No sorry, I didn’t really have time to figure it out as I wanted to have a working indexing asap for work. It was challenging to set it up without sudo on rhel.
I did provide correct compile_commands.json that ccls has no problems with — but clangd just bugged out every single time on it.
I think it was a bug with a clagd9 iirc.
If it’s also a pressing matter for you try out @MaskRay ccls. It’s even better than clangd especially in ssh environment.

@ZoeGM1997 and @notox

sorry for losing track here. but clangd doesn’t read any configuration specific to an editor (vscode in this case) as it needs to be working with multiple editors. so instead it reads compile flags through compile_commands.json or compile_flags.txt that can be generated by hand or by the build system.

in case of a mingw toolchain, making sure your flags have the correct target set (e.g. -target x86_64-pc-windows-gnu) usually gets the job done.

@ZoeGM1997 and @notox

sorry for losing track here. but clangd doesn’t read any configuration specific to an editor (vscode in this case) as it needs to be working with multiple editors. so instead it reads compile flags through compile_commands.json or compile_flags.txt that can be generated by hand or by the build system.

in case of a mingw toolchain, making sure your flags have the correct target set (e.g. -target x86_64-pc-windows-gnu) usually gets the job done.

-target x86_64-pc-windows-gnu is worked. Thank you for your help.

I used CMake to generate compile_commands.json. I’m new to use CMake and don’t know how to set the target in CMakeLists.txt. Do you know that?

1 similar comment

@ZoeGM1997 and @notox

sorry for losing track here. but clangd doesn’t read any configuration specific to an editor (vscode in this case) as it needs to be working with multiple editors. so instead it reads compile flags through compile_commands.json or compile_flags.txt that can be generated by hand or by the build system.

in case of a mingw toolchain, making sure your flags have the correct target set (e.g. -target x86_64-pc-windows-gnu) usually gets the job done.

-target x86_64-pc-windows-gnu is worked. Thank you for your help.

I used CMake to generate compile_commands.json. I’m new to use CMake and don’t know how to set the target in CMakeLists.txt. Do you know that?

I used CMake to generate compile_commands.json. I’m new to use CMake and don’t know how to set the target in CMakeLists.txt. Do you know that?

@notox Did you find a way to do it? I tried adding -target x86_64-pc-windows-gnu to my config file, but it does not work.

i don’t understand why would you close this issue while it still not solved after 2 years
im really disappointed.

I know it is not windows but I was able to resolve this issue on linux via:

Creating a env (environment) variable that clangd looks for called CLANGD_FLAGS and assigning it the path to my c++ 11 path and putting this into my .bashrc file. here is what that looked like:

inside .bashrc

export CLANGD_FLAGS="-I/usr/include/c++/11 --log=Verbose"

NOTE:

your path may vary obviously.. Just be sure to precede your path with the -I option.
I added the —log=verbose for testing purposes and its not needed.
you can also just link the path to a compile_commands.json file if you desire more settings or specifics
ex:

export CLANGD_FLAGS="--log=verbose --compile-commands-dir=/path/to/compile_commands.json --flag1 --flag2"

Did you find solution for this issue. I am facing this issue when I tried to cross compile my project for ARM target

Not sure if this is related (I’m no C++ expert), but in my case (on Kubuntu 22.04) the following Stackoverlflow thread was the solution to my scenario: https://stackoverflow.com/a/74894721

Not sure if this is related (I’m no C++ expert), but in my case (on Kubuntu 22.04) the following Stackoverlflow thread was the solution to my scenario: https://stackoverflow.com/a/74894721

See #1394 for more discussion of the issue affecting Ubuntu 22.04

any way to fix this on windows? (I use vscodium)

Источник

На прошлой неделе на конференции Going Native Чендлер Кэррут объявил о существовании готовых двоичных файлов для запуска clang на windows. Та же информация есть в сообщении в блоге Вот. Целевой аудиторией для этого являются пользователи Visual Studio, но я хочу запустить clang из командной строки.

Я запустил установщик и добавил LLVM bin каталог к моему пути, но когда я пытаюсь скомпилировать «Hello world», я получаю это:

C:\>clang hello.cpp
hello.cpp:1:10: fatal error: 'iostream' file not found
#include <iostream>
^
1 error generated.

Я не могу найти какую-либо информацию о том, как настроить Clang для работы в Windows, и я предполагаю, что после того, как я выясню, как указать Clang, где искать стандартные заголовки библиотеки, мне придется указать, где искать для библиотек, чтобы связаться с. Может ли кто-нибудь шаг за шагом провести меня через установку или указать мне на такое прохождение?

Решение

Это старый вопрос, и с тех пор многое изменилось. Учитывая, что это обычная проблема при использовании Clang в Windows, он заслуживает обновленного ответа.

Начиная с 2017 года, для сборки LLVM 3.9.1 для Windows требуется следующее, чтобы иметь возможность вызывать clang из твоей раковины.

У нас до сих пор нет порта libc ++ для Windows, поэтому Clang использует библиотеки VC ++, а также компоновщик VC ++.

Итак, прежде всего вам нужно Инструменты сборки VC ++ в вашей системе. Обратите внимание, что они уже установлены, если у вас есть IDE Visual C ++.

Вы должны указать Clang, где найти инструменты для сборки и его библиотеки.

Вариант 1 (vcvarsall.bat)

Это самый простой и стандартный вариант.

Бежать

> "%VS140COMNTOOLS%../../VC/vcvarsall.bat" amd64

Замена amd64 с вашей целевой архитектурой на Clang, которая может быть x86, amd64 или же arm, Вы можете заменить %VS140COMNTOOLS% а также, если у вас есть другая версия набора инструментов VC ++.

В качестве ярлыка вы можете запустить командную строку Visual C ++ вместо cmd+vcvarsall, так как вам нужно вызывать этот пакет для каждой командной строки, которую вы открываете.

Теперь вы можете наслаждаться Clang.

Вариант 2 (вручную)

Если вы не можете бежать vcvarsall.bat или хотите автоматизировать этот процесс, добро пожаловать, у меня была такая же потребность.

Все следующие переменные окружения устанавливаются автоматически vcvarsall.bat, так что вы можете запустить это и взять значения вашей машины оттуда. Я приведу мины в качестве примеров, и в надежде, что это то же самое в другом месте.

Установить INCLUDE переменная среды для C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE;C:\Program Files (x86)\Windows Kits\10\include\10.0.10240.0\ucrt;C:\Program Files (x86)\Windows Kits\8.1\include\shared;C:\Program Files (x86)\Windows Kits\8.1\include\um;C:\Program Files (x86)\Windows Kits\8.1\include\winrt;

Задавать LIB в C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\LIB\amd64;C:\Program Files (x86)\Windows Kits\10\lib\10.0.10240.0\ucrt\x64;C:\Program Files (x86)\Windows Kits\8.1\lib\winv6.3\um\x64;, Обратите внимание на специфические компоненты архитектуры!

Для инструментов сборки, вы можете иметь инструменты на PATH или настроить VCINSTALLDIR переменная окружения. Clang попробует оба, одобряя VCINSTALLDIR,

Задавать VCINSTALLDIR в %VS140COMNTOOLS%../../VC или добавить %VS140COMNTOOLS%../../VC/bin/amd64 на ваш PATH,

Все это очень плохо документировано, поэтому требования могут измениться в любое время, но Clang MSVC водитель пытается максимально автоматизировать это, запрашивая реестр Windows и многие другие приемы, поэтому в будущем больше ничего из этого может не понадобиться.

Другие решения

Если вы не ограничены в использовании компиляторов Microsoft. Вы можете использовать Clang с MinGW-W64. Просто установите последнюю версию бинарный файл для Windows а также MinGW-w64.

Вы можете использовать следующий код для компиляции вашего исходного файла

clang++ -target x86_64-pc-windows-gnu test.cc -o test.exe

Источник

Forum
Beginners
Using clang directly from the binary dow

Using clang directly from the binary download

I would like to try clang. My only requirement is to build a few C++ programs.

There is a binary download for clang on the clang downloads page (in the section «Pre-built Binaries»), with the text «Clang for Windows 64-bit (sig)», but the file it downloads is LLVM-3.8.0-win64.exe, (for Windows 64-bit). This seems to be the LLVM backend.

How can I use this file to build a C++ program? Can I use it directly or do I need to go through the «frontend» (clang)? There is no separate option or file named «clang» in the binary download.

Thanks
Steven

Last edited on

LLVM-3.8.0-win64.exe is the installer. Run he installer to install clang++-3.8.
Opt to add LLVM to the path, and after installation, from the command prompt type clang++ —version
and you should see something like:

clang version 3.8.0 (branches/release_38)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin

This is another option, if you already have (or intend to install) Visual Studio 2015
( Community Edition: https://www.visualstudio.com/en-us/products/visual-studio-community-vs.aspx )

From the Visual Studio menu,
choose File | New | Project | C++ | Cross Platform | Install Clang with Microsoft Codegen.
This will download and install the clang++ front-end.
Once the front-end is installed, you can cancel the creation of the Cross Platform project.

Now, create a normal Windows C++ Project: File | New | Project | C++ | Win32 Console Application
After the project is created, to use the clang++ front-end, from the menu, choose Project | Properties
In the property pages Dialog, choose Configuration Properties | General (left pane)
and Platform Toolset | Clang 3.8 with Microsoft Codegen (right pane, choose from list)

Thanks for this input. It has worked successfully.

However, I have written a makefile to build a «Hello World» program. The build starts, but clang gives a fatal error at the line:

The error is:


'iostream' file not found

I have searched in the clang install directory’s subdirectories. There are several .h files, but iostream is not there.

Thanks

I find that none of the expected h files are to be found. eg: <vector>, <map>, etc.

I am on Windows.

I am accessing the make system through MSYS, which I had earlier downloaded along with minGW.

minGW and g++ work fine, but I am unable (so far) to get clang to work.

The standard LLVM builds for clang++ on Windows (for instance LLVM-3.8.0-win64.exe) requires that he Microsoft implementation of the standard library and headers (at least Visual Studio 2013 Express IIRC) is installed. It does not look for, and will not use either MinGW/MSYS or the GNU libraries.

And then use a command line like:

clang-cl -Xclang -fms-compatibility-version=19 -Xclang -std=c++14 -Xclang -Wall  -Xclang -Wextra -Xclang pedantic-errors myfile.cpp

clang-cl

— compiler driver that establishes Microsoft compatibility

-Xclang

— the following option is to be passed verbatim to the clang++ compiler

-fms-compatibility-version=19

— the version of Microsoft C++ that clang++ should target.
Here, =19 is an example — the Microsoft C++ version 19 (the one shipped with Visual Studio 2015, and has C++14 support)

Is it possible to have a «non-standard» LLVM build in which LLVM can be installed with its _own_ standard library and headers?

Thanks.

> Is it possible to have a «non-standard» LLVM build in which LLVM can be installed
> with its _own_ standard library and headers?

Currently, this is possible only on the BSD family of operating systems.

On linux, there is an implementation of clang++/libc++, but it has a few dependencies on the GNU libsupc++

On Windows, there is no current implementation of LLVM libc++.

I have downloaded the following package from MS and installed it successfully: vc_redist.x64. However, the same problem occurs when building a program using clang. I thought this download was the MS C++ standard library.

Perhaps the entire MS VC++ download needs to be done and that’s a big download running into GB.

Thanks.

> Perhaps the entire MS VC++ download needs to be done

Yes. vc_redist.x64 contains only the compiled library binaries; it does not have headers and build tools.

> big download running into GB

For a much smaller download size, and easy installation, Cygwin http://cygwin.com/
and its clang package https://cygwin.com/cgi-bin2/package-grep.cgi?grep=clang-3.7&arch=x86_64
(You don’t need the src package, unless you want to build clang from source. Version is 3.7, not 3.8)

Last edited on

Thanks for this tip.

I have now done the following:
1) I have installed cygwin on my PC.
2) Since the package you identified was for clang 3.7.1, I uninstalled clang 3.8 from my PC and installed the clang 3.7.1 binary instead.

Clicking on the link provided by you: https://cygwin.com/cgi-bin2/package-grep.cgi?grep=clang-3.7&arch=x86_64 takes me to the cygwin page where I can see the package details, but not _install_ the package. Do I need to go to the clang website for the installation? I checked this out, but it appears I need to download the clang source and build it.

Alternatively perhaps I’m missing something here.

Thanks.

Alternatively perhaps I’m missing something here.

If you visit https://cygwin.com/install.html which is one of the links listed on the top left of the page linked to by JLBorges, you’ll learn how to install cygwin and its various packages.

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