1# Check if the compiler-rt library file path exists. 2# If found, cache the path in: 3# COMPILER_RT_LIBRARY-<name>-<target> 4# If err_flag is true OR path not found, emit a message and set: 5# COMPILER_RT_LIBRARY-<name>-<target> to NOTFOUND 6function(cache_compiler_rt_library err_flag name target library_file) 7 if(err_flag OR NOT EXISTS "${library_file}") 8 message(WARNING "Failed to find compiler-rt ${name} library for ${target}") 9 set(COMPILER_RT_LIBRARY_${name}_${target} "NOTFOUND" CACHE INTERNAL 10 "compiler-rt ${name} library for ${target}") 11 else() 12 message(STATUS "Found compiler-rt ${name} library: ${library_file}") 13 set(COMPILER_RT_LIBRARY_${name}_${target} "${library_file}" CACHE INTERNAL 14 "compiler-rt ${name} library for ${target}") 15 endif() 16endfunction() 17 18function(get_component_name name variable) 19 if(APPLE) 20 if(NOT name MATCHES "builtins.*") 21 set(component_name "${name}_") 22 endif() 23 if (CMAKE_OSX_SYSROOT MATCHES ".+MacOSX.+") 24 set(component_name "${component_name}osx") 25 26 elseif (CMAKE_OSX_SYSROOT MATCHES ".+iPhoneOS.+") 27 set(component_name "${component_name}ios") 28 elseif (CMAKE_OSX_SYSROOT MATCHES ".+iPhoneSimulator.+") 29 set(component_name "${component_name}iossim") 30 31 elseif (CMAKE_OSX_SYSROOT MATCHES ".+AppleTVOS.+") 32 set(component_name "${component_name}tvos") 33 elseif (CMAKE_OSX_SYSROOT MATCHES ".+AppleTVSimulator.+") 34 set(component_name "${component_name}tvossim") 35 36 elseif (CMAKE_OSX_SYSROOT MATCHES ".+WatchOS.+") 37 set(component_name "${component_name}watchos") 38 elseif (CMAKE_OSX_SYSROOT MATCHES ".+WatchSimulator.+") 39 set(component_name "${component_name}watchossim") 40 else() 41 message(WARNING "Unknown Apple SDK ${CMAKE_OSX_SYSROOT}, we don't know which compiler-rt library suffix to use.") 42 endif() 43 else() 44 set(component_name "${name}") 45 endif() 46 set(${variable} "${component_name}" PARENT_SCOPE) 47endfunction() 48 49# Find the path to compiler-rt library `name` (e.g. "builtins") for the 50# specified `TARGET` (e.g. "x86_64-linux-gnu") and return it in `variable`. 51# This calls cache_compiler_rt_library that caches the path to speed up 52# repeated invocations with the same `name` and `target`. 53function(find_compiler_rt_library name variable) 54 cmake_parse_arguments(ARG "SHARED" "TARGET;FLAGS" "" ${ARGN}) 55 # While we can use compiler-rt runtimes with other compilers, we need to 56 # query the compiler for runtime location and thus we require Clang. 57 if(NOT CMAKE_CXX_COMPILER_ID MATCHES Clang) 58 set(${variable} "NOTFOUND" PARENT_SCOPE) 59 return() 60 endif() 61 set(target "${ARG_TARGET}") 62 if(NOT target AND CMAKE_CXX_COMPILER_TARGET) 63 set(target "${CMAKE_CXX_COMPILER_TARGET}") 64 endif() 65 if(NOT DEFINED COMPILER_RT_LIBRARY_builtins_${target}) 66 # If the cache variable is not defined, invoke Clang and then 67 # set it with cache_compiler_rt_library. 68 set(clang_command ${CMAKE_CXX_COMPILER} "${ARG_FLAGS}") 69 if(target) 70 list(APPEND clang_command "--target=${target}") 71 endif() 72 get_property(cxx_flags CACHE CMAKE_CXX_FLAGS PROPERTY VALUE) 73 string(REPLACE " " ";" cxx_flags "${cxx_flags}") 74 list(APPEND clang_command ${cxx_flags}) 75 set(cmd_prefix "") 76 if(MSVC AND ${CMAKE_CXX_COMPILER_ID} MATCHES "Clang") 77 set(cmd_prefix "/clang:") 78 endif() 79 execute_process( 80 COMMAND ${clang_command} "${cmd_prefix}--rtlib=compiler-rt" "${cmd_prefix}-print-libgcc-file-name" 81 RESULT_VARIABLE had_error 82 OUTPUT_VARIABLE library_file 83 ) 84 string(STRIP "${library_file}" library_file) 85 file(TO_CMAKE_PATH "${library_file}" library_file) 86 get_filename_component(dirname ${library_file} DIRECTORY) 87 if(APPLE) 88 execute_process( 89 COMMAND ${clang_command} "--print-resource-dir" 90 RESULT_VARIABLE had_error 91 OUTPUT_VARIABLE resource_dir 92 ) 93 string(STRIP "${resource_dir}" resource_dir) 94 set(dirname "${resource_dir}/lib/darwin") 95 endif() 96 get_filename_component(basename ${library_file} NAME) 97 if(basename MATCHES ".*clang_rt\.([a-z0-9_\-]+)\.(a|lib)") 98 set(from_name ${CMAKE_MATCH_1}) 99 get_component_name(${CMAKE_MATCH_1} to_name) 100 string(REPLACE "${from_name}" "${to_name}" basename "${basename}") 101 set(library_file "${dirname}/${basename}") 102 cache_compiler_rt_library(${had_error} builtins "${target}" "${library_file}") 103 endif() 104 endif() 105 if(NOT COMPILER_RT_LIBRARY_builtins_${target}) 106 set(${variable} "NOTFOUND" PARENT_SCOPE) 107 return() 108 endif() 109 if(NOT DEFINED COMPILER_RT_LIBRARY_${name}_${target}) 110 # Clang gives only the builtins library path. Other library paths are 111 # obtained by substituting "builtins" with ${name} in the builtins 112 # path and then checking if the resultant path exists. The result of 113 # this check is also cached by cache_compiler_rt_library. 114 set(library_file "${COMPILER_RT_LIBRARY_builtins_${target}}") 115 get_component_name("builtins" from_name) 116 get_component_name(${name} to_name) 117 get_filename_component(basename ${library_file} NAME) 118 string(REPLACE "${from_name}" "${to_name}" basename "${basename}") 119 if (ARG_SHARED) 120 string(REGEX REPLACE "\.(a|lib)$" ".so" basename "${basename}") 121 endif() 122 get_filename_component(dirname ${library_file} DIRECTORY) 123 set(library_file "${dirname}/${basename}") 124 cache_compiler_rt_library(FALSE "${name}" "${target}" "${library_file}") 125 endif() 126 set(${variable} "${COMPILER_RT_LIBRARY_${name}_${target}}" PARENT_SCOPE) 127endfunction() 128