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# Using `sccache` with Xcode
It is possible to use `sccache` with Xcode with some setup.
### Running the daemon
Before building, you need to run the daemon outside of Xcode. This needs to be done because if `sccache` invocation happens to implicitly start the server daemon, the Xcode build will hang on the `sccache` invocation, waiting for the process to idle timeout.
You can do this in another terminal windows by calling
```sh
SCCACHE_LOG=info SCCACHE_START_SERVER=1 SCCACHE_NO_DAEMON=1 sccache
```
Or by setting it up in a `launchd` configuration, perhaps as `~/Library/LaunchAgents/sccache.plist` (note the paths in the plist):
```xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>sccache.server</string>
<key>ProgramArguments</key>
<array>
<string>/path/to/sccache</string>
</array>
<key>EnvironmentVariables</key>
<dict>
<key>SCCACHE_START_SERVER</key>
<string>1</string>
<key>SCCACHE_NO_DAEMON</key>
<string>1</string>
<key>SCCACHE_IDLE_TIMEOUT</key>
<string>0</string>
<key>SCCACHE_LOG</key>
<string>info</string>
</dict>
<key>StandardOutPath</key>
<string>/tmp/sccache.log</string>
<key>StandardErrorPath</key>
<string>/tmp/sccache.log</string>
</dict>
</plist>
```
### Setting it up for `xcodebuild`
Xcode seems to support barely documented `C_COMPILER_LAUNCHER` attribute, for
having a custom launcher program.
Then you can invoke `xcodebuild` like so
```sh
xcodebuild C_COMPILER_LAUNCHER=sccache
CLANG_ENABLE_MODULES=NO
COMPILER_INDEX_STORE_ENABLE=NO
CLANG_USE_RESPONSE_FILE=NO
```
Where the additional arguments are for disabling some features that `sccache` can't cache currently.
These build settings can also be put in a xcconfig file, like `sccache.xcconfig`
```
C_COMPILER_LAUNCHER=sccache
CLANG_ENABLE_MODULES=NO
COMPILER_INDEX_STORE_ENABLE=NO
CLANG_USE_RESPONSE_FILE=NO
```
Which can then be invoked with
```sh
xcodebuild -xcconfig sccache.xcconfig
```
### Setting it up for `cmake` Xcode generator
While `cmake` has the convenient `CMAKE_<LANG>_COMPILER_LAUNCHER` for prepending tools like `sccache`, it is not supported for the Xcode generator.
But you can configuring it directly with something like
```cmake
# This bit before the first `project()`, as the COMPILER_LAUNCHER variables are read in then
if(DEFINED CCACHE)
find_program(CCACHE_EXE ${CCACHE} REQUIRED)
if(NOT CMAKE_GENERATOR STREQUAL "Xcode")
# Support for other generators should work with these
set(CMAKE_C_COMPILER_LAUNCHER "${CCACHE_EXE}")
set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_EXE}")
else()
# And this should work for Xcode generator
set(CMAKE_XCODE_ATTRIBUTE_C_COMPILER_LAUNCHER ${CCACHE_EXE})
set(CMAKE_XCODE_ATTRIBUTE_CLANG_ENABLE_MODULES "NO")
set(CMAKE_XCODE_ATTRIBUTE_COMPILER_INDEX_STORE_ENABLE "NO")
set(CMAKE_XCODE_ATTRIBUTE_CLANG_USE_RESPONSE_FILE "NO")
endif()
endif()
```
Then configuring with `-DCCACHE=sccache` should work on all generators.
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