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[CMake] Add experimental support for building compiler-rt for iOS
Summary: This is a reunification of three separate reviews D11073, D11082, D11083. Having them separate was not constructive even though the patches were smaller because it led to fragmented conversations, and this is really all about one change. This patch incorporates feedback from samsonov, and refactors the hacky darwin code out of the root CMakeLists.txt and int config-ix.cmake. Reviewers: zaks.anna, bogner, kubabrecka, chandlerc, samsonov Subscribers: jevinskie, filcab, llvm-commits Differential Revision: http://reviews.llvm.org/D11820 llvm-svn: 244948
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Chris Bieneman
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Aug 13, 2015
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| # On OS X SDKs can be installed anywhere on the base system and xcode-select can | ||
| # set the default Xcode to use. This function finds the SDKs that are present in | ||
| # the current Xcode. | ||
| function(find_darwin_sdk_dir var sdk_name) | ||
| # Let's first try the internal SDK, otherwise use the public SDK. | ||
| execute_process( | ||
| COMMAND xcodebuild -version -sdk ${sdk_name}.internal Path | ||
| OUTPUT_VARIABLE var_internal | ||
| OUTPUT_STRIP_TRAILING_WHITESPACE | ||
| ERROR_FILE /dev/null | ||
| ) | ||
| if("" STREQUAL "${var_internal}") | ||
| execute_process( | ||
| COMMAND xcodebuild -version -sdk ${sdk_name} Path | ||
| OUTPUT_VARIABLE var_internal | ||
| OUTPUT_STRIP_TRAILING_WHITESPACE | ||
| ERROR_FILE /dev/null | ||
| ) | ||
| endif() | ||
| set(${var} ${var_internal} PARENT_SCOPE) | ||
| endfunction() | ||
|
|
||
| # There isn't a clear mapping of what architectures are supported with a given | ||
| # target platform, but ld's version output does list the architectures it can | ||
| # link for. | ||
| function(darwin_get_toolchain_supported_archs output_var) | ||
| execute_process( | ||
| COMMAND ld -v | ||
| ERROR_VARIABLE LINKER_VERSION) | ||
|
|
||
| string(REGEX MATCH "configured to support archs: ([^\n]+)" | ||
| ARCHES_MATCHED "${LINKER_VERSION}") | ||
| if(ARCHES_MATCHED) | ||
| set(ARCHES "${CMAKE_MATCH_1}") | ||
| message("Matched ARCHES: ${ARCHES}") | ||
| string(REPLACE " " ";" ARCHES ${ARCHES}) | ||
| else() | ||
| # If auto-detecting fails, fall back to a default set | ||
| message(WARNING "Detecting supported architectures from 'ld -v' failed. Returning default set.") | ||
| set(ARCHES "i386;x86_64;armv7;armv7s;arm64") | ||
| endif() | ||
|
|
||
| set(${output_var} ${ARCHES} PARENT_SCOPE) | ||
| endfunction() | ||
|
|
||
| # This function takes an OS and a list of architectures and identifies the | ||
| # subset of the architectures list that the installed toolchain can target. | ||
| function(darwin_test_archs os valid_archs) | ||
| set(archs ${ARGN}) | ||
| message(STATUS "Finding valid architectures for ${os}...") | ||
| set(SIMPLE_CPP ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/src.cpp) | ||
| file(WRITE ${SIMPLE_CPP} "#include <iostream>\nint main() { return 0; }\n") | ||
|
|
||
| set(os_linker_flags) | ||
| foreach(flag ${DARWIN_${os}_LINKFLAGS}) | ||
| set(os_linker_flags "${os_linker_flags} ${flag}") | ||
| endforeach() | ||
|
|
||
| # The simple program will build for x86_64h on the simulator because it is | ||
| # compatible with x86_64 libraries (mostly), but since x86_64h isn't actually | ||
| # a valid or useful architecture for the iOS simulator we should drop it. | ||
| if(${os} STREQUAL "iossim") | ||
| list(REMOVE_ITEM archs "x86_64h") | ||
| endif() | ||
|
|
||
| set(working_archs) | ||
| foreach(arch ${archs}) | ||
|
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||
| set(arch_linker_flags "-arch ${arch} ${os_linker_flags}") | ||
| try_compile(CAN_TARGET_${os}_${arch} ${CMAKE_BINARY_DIR} ${SIMPLE_CPP} | ||
| COMPILE_DEFINITIONS "-v -arch ${arch}" ${DARWIN_${os}_CFLAGS} | ||
| CMAKE_FLAGS "-DCMAKE_EXE_LINKER_FLAGS=${arch_linker_flags}" | ||
| OUTPUT_VARIABLE TEST_OUTPUT) | ||
| if(${CAN_TARGET_${os}_${arch}}) | ||
| list(APPEND working_archs ${arch}) | ||
| endif() | ||
| endforeach() | ||
| set(${valid_archs} ${working_archs} PARENT_SCOPE) | ||
| endfunction() |
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