How can I specify additional clang options for Xcode project?

Question

I have created my custom `clang` plugin with help of this tutorial and I want to run it automatically on my Xcode iOS project. I need to run following additional commands on `clang`, ``` -Xclang -load \ -Xclang ~/static_analysis/llvm/Debug+Asserts/lib/libPluginExample.so \ -Xclang -plugin -Xclang -example-plugin \ ``` I would like to save all other commands generated by Xcode, because it is difficult to create and pass those commands for every Xcode project. That is the reason why I choose to use `clang` plugin but not `clang` tool. How can I do achieve this? Or how can I extract compiler flags generated by xcode aoutomtically, to use them in clang tool? (becouse, for correct using tool I need to specify all include directories, and all sources, and all frameworks) Update: I have added thous commands in Project Settings -> Build Phases -> Compile Sources (double click on source) , but in compile time there is error (plugin is standard example libPrintFunctionNames.dylib from clang sou…

Accepted Answer

I would specify additional Clang options in build option OTHER_CFLAGS. You can do so in

```
target/project Build Settings -> Apple LLVM 5.0 - Custom Compiler Flags -> Other C Flags
```

Or you can specify OTHER_CFLAGS for `xcodebuild`, for example,

```
xcodebuild -scheme SampleProject build OTHER_CFLAGS="-Xclang -load -Xclang /path/to/libPrintFunctionNames.dylib -Xclang -plugin -Xclang print-fns"
```

`xcodebuild` is convenient when you don't want to maintain 2 targets which differ only in OTHER_CFLAGS.

But you're right, it looks like you really need to link against the same libraries as clang itself is linked. At least I've downloaded Clang+LLVM 3.3 binaries from http://llvm.org/releases/download.html , built the plugin with downloaded libraries and it works with clang from http://llvm.org, but doesn't work with clang from Xcode - I encounter the following error:

```
error: unable to find plugin 'print-fns'
```

I've created Xcode workspace which builds Clang plugin and shows how you can try to use it with default iOS application. You can find it at https://github.com/vsapsai/ClangPluginExample

How can I specify additional clang options for Xcode project?

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