macOS 'wchar.h' File Not Found

Question

Under OS X 10.9.5 using XCode 6.0.1 I am running into the following issue when I try to run make from the terminal:

fatal error: 'wchar.h' file not found

This issue was not happening prior to a recent upgrade to Mavericks.

Solution 1

First ensure that the latest XCode is installed. Next, we need to install/fix/update Command Line Tools. To do so, run

xcode-select --install

Previously, XCode expected it's active developer directory to be located at

/Applications/Xcode.app/Contents/Developer/

but the latest Command Line Tools is installed to

/Library/Developer/CommandLineTools/

so we need to switch where XCode is looking. To do so, run

sudo xcode-select --switch /Library/Developer/CommandLineTools/

And that should be it. These steps solved the issue for myself and two coworkers.

Solution 2

• My error was similar to yours which said string.h not found, I solved it by running this command:

open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg

I think that the problem is that for macOS Mojave users, the headers are no longer installed under /usr/include by default.

Solution 3

Adding on ssell's post and peter70's comment, I also still had issues after installing xcode command line tools again, and switching the xcode active developer directory. I was using CMake, and so deleted the debug/release folders which had existing Makefiles referencing out-of-date locations on Mojave. So for future problem resolving, after running the commands from ssell's post:

xcode-select --install

sudo xcode-select --switch /Library/Developer/CommandLineTools/

I believe if you've installed the command line tools by installing Xcode itself, you may also need to agree to the licence with sudo xcodebuild --license. I don't think this is necessary if you used the prior xcode-select command.

Then also delete generated build scripts. If using CMake, delete the cmake-build-debug and cmake-build-release directories (your names may vary)

Solution 4

Deleting all the generated files and restarted the compilation worked for me. It was suggested in this link:

https://discourse.brew.sh/t/solved-scan-build-from-llvm-7-0-seems-broken-on-macos-mojave/3151/14

Solution 5

Deleting all the generated files, like @Alfredo Morales Pinzón. If you use cmake, so you need to delete the work dictionary which is "cmake-build-debug" and regenerated the "cmake-build-debug".

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Comments

[Euphorbium]

Does not work for me. I can see that wchar.h file is located on /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeD‌​efault.xctoolchain/u‌​sr/include/c++/v1/wc‌​har.h and it should be found. There is no such file in command line tools folder (and deeper there)

[peter70]

I had the same problem, but with string.h The solution for me was to delete "by hand" (with Finder) all output directories. The problem was that some old output files referenced out-of-date XCode paths. After I deleted all the output files, the problem was solved

[Piotr99]

@peter70 Where are the output files you're referring to located? I encountered this issue with a Qt build, and I have no idea where to start looking for those output files.

[peter70]

@Piotr99 If I remember correctly, they were the normal output files, in the output directory I specified (in Qt Projects Build Settings)

[Jan Moritz]

This works in combination with this answer stackoverflow.com/a/26185979/2652054

[ch271828n]

Works for me! (Here is my case: seems that I firstly let cmake generated those files (months ago), then update the mac version, then try to make / cmake again.)

[ch271828n]

Works for me! (Here is my case: seems that I firstly let cmake generated those files (months ago), then update the mac version, then try to make / cmake again.)

[Wenmin Wu]

No Packages folder under /Library/Developer/CommandLineTools/.only have following folders Library, SDKs and usr