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Implement features required by Xcode (#2257)
* Mark `-index-store-path` as Hard Xcode sets it by default, but it can be disabled with `COMPILER_INDEX_STORE_ENABLE=NO` Xcode build setting. * Mark serialize-diagnostics and deps as artifacts Xcode requires these files to be present after compiling, so they need to be stored and restored for the build to complete. * Update tests for the dep changes * Add test for `-index-store-path` * Add documentation for Xcode use * Xcode integration test * Add comment about wrapper script use
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| # Using `sccache` with Xcode | ||
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| It is possible to use `sccache` with Xcode with some setup. | ||
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| ### 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. | ||
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| You can do this in another terminal windows by calling | ||
| ```sh | ||
| SCCACHE_LOG=info SCCACHE_START_SERVER=1 SCCACHE_NO_DAEMON=1 sccache | ||
| ``` | ||
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| 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> | ||
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| <key>StandardOutPath</key> | ||
| <string>/tmp/sccache.log</string> | ||
| <key>StandardErrorPath</key> | ||
| <string>/tmp/sccache.log</string> | ||
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| </dict> | ||
| </plist> | ||
| ``` | ||
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| ### Setting it up for `xcodebuild` | ||
| When you override the `CC` variable for `xcodebuild`, it seems to always escape the spaces, so its not enough to just set it, but we need a wrapper script, something like | ||
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| ```sh | ||
| echo "#\!/bin/sh\nsccache $(xcrun -f cc) \$@" > wrapper.sh | ||
| chmod +x wrapper.sh | ||
| ``` | ||
| (YMMV if you need to select another sdk or toolchain for the xcrun) | ||
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| Then you can invoke `xcodebuild` like so | ||
| ```sh | ||
| xcodebuild CC="$(pwd)/wrapper.sh" | ||
| CLANG_ENABLE_MODULES=NO | ||
| COMPILER_INDEX_STORE_ENABLE=NO | ||
| ``` | ||
| Where the additional arguments are for disabling some features that `sccache` can't cache currently. | ||
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| These build settings can also be put in a xcconfig file, like `sccache.xcconfig` | ||
| ``` | ||
| CC=$(SRCROOT)/wrapper.sh | ||
| CLANG_ENABLE_MODULES=NO | ||
| COMPILER_INDEX_STORE_ENABLE=NO | ||
| ``` | ||
| Which can then be invoked with | ||
| ```sh | ||
| xcodebuild -xcconfig sccache.xcconfig | ||
| ``` | ||
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| ### Setting it up for `cmake` Xcode generator | ||
| While `cmake` has the convenient `CMAKE_<LANG>_COMPILER_LAUNCHER` for prepending tools like `sccache`, it is not supported for the Xcode generator. | ||
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| It can be then integrated with having a template file for the wrapper script, `launcher.sh.in`: | ||
| ```sh | ||
| #!/bin/sh | ||
| exec "${CCACHE_EXE}" "${LAUNCHER_COMPILER}" "$@" | ||
| ``` | ||
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| And then configuring it 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}") | ||
| endif() | ||
| endif() | ||
| # .. your project stuff .. | ||
| # This bit needs to be after the first `project()` call, to have valid `CMAKE_C_COMPILER` variable. | ||
| # Alternatively in a file included with CMAKE_PROJECT_INCLUDE | ||
| if(DEFINED CCACHE) | ||
| if(CMAKE_GENERATOR STREQUAL "Xcode") | ||
| set(LAUNCHER_COMPILER ${CMAKE_C_COMPILER}) | ||
| configure_file(${CMAKE_CURRENT_LIST_DIR}/launcher.sh.in launcher-cc.sh) | ||
| execute_process(COMMAND chmod a+rx | ||
| "${CMAKE_CURRENT_BINARY_DIR}/launcher-cc.sh") | ||
| set(CMAKE_XCODE_ATTRIBUTE_CC "${CMAKE_CURRENT_BINARY_DIR}/launcher-cc.sh") | ||
| set(CMAKE_XCODE_ATTRIBUTE_CLANG_ENABLE_MODULES "NO") | ||
| set(CMAKE_XCODE_ATTRIBUTE_COMPILER_INDEX_STORE_ENABLE "NO") | ||
| endif() | ||
| endif() | ||
| ``` | ||
| Then configuring with `-DCCACHE=sccache` should work on all generators. | ||
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