1set(LLVM_LINK_COMPONENTS support)
2
3set(BUILDVARIABLES_SRCPATH ${CMAKE_CURRENT_SOURCE_DIR}/BuildVariables.inc.in)
4set(BUILDVARIABLES_OBJPATH ${CMAKE_CURRENT_BINARY_DIR}/BuildVariables.inc)
5
6# Add the llvm-config tool.
7add_llvm_tool(llvm-config
8  llvm-config.cpp
9  )
10
11# Compute the substitution values for various items.
12get_property(SUPPORT_SYSTEM_LIBS TARGET LLVMSupport PROPERTY LLVM_SYSTEM_LIBS)
13get_property(WINDOWSMANIFEST_SYSTEM_LIBS TARGET LLVMWindowsManifest PROPERTY LLVM_SYSTEM_LIBS)
14foreach(l ${SUPPORT_SYSTEM_LIBS} ${WINDOWSMANIFEST_SYSTEM_LIBS})
15  if(MSVC)
16    set(SYSTEM_LIBS ${SYSTEM_LIBS} "${l}.lib")
17  else()
18    if (l MATCHES "^-")
19      # If it's an option, pass it without changes.
20      set(SYSTEM_LIBS ${SYSTEM_LIBS} "${l}")
21    else()
22      # Otherwise assume it's a library name we need to link with.
23      if(IS_ABSOLUTE ${l})
24        set(SYSTEM_LIBS ${SYSTEM_LIBS} "${l}")
25      else()
26        set(SYSTEM_LIBS ${SYSTEM_LIBS} "-l${l}")
27      endif()
28    endif()
29  endif()
30endforeach()
31string(REPLACE ";" " " SYSTEM_LIBS "${SYSTEM_LIBS}")
32
33# Fetch target specific compile options, e.g. RTTI option
34get_property(COMPILE_FLAGS TARGET llvm-config PROPERTY COMPILE_FLAGS)
35
36# NOTE: We don't want to start extracting any random C/CXX flags that the
37# user may add that could affect the ABI.  We only want to extract flags
38# that have been added by the LLVM build system.
39string(REGEX MATCH "-stdlib=[^ ]+" LLVM_CXX_STDLIB_FLAG ${CMAKE_CXX_FLAGS})
40string(REGEX MATCH "-std=[^ ]+" LLVM_C_STD_FLAG ${CMAKE_C_FLAGS})
41
42# Use configure_file to create BuildVariables.inc.
43set(LLVM_SRC_ROOT ${LLVM_MAIN_SRC_DIR})
44set(LLVM_OBJ_ROOT ${LLVM_BINARY_DIR})
45set(LLVM_CPPFLAGS "${LLVM_DEFINITIONS}")
46set(LLVM_CFLAGS "${LLVM_C_STD_FLAG} ${LLVM_DEFINITIONS}")
47# The language standard potentially affects the ABI/API of LLVM, so we want
48# to make sure it is reported by llvm-config.
49set(LLVM_CXXFLAGS "${CMAKE_CXX${CMAKE_CXX_STANDARD}_STANDARD_COMPILE_OPTION} ${LLVM_CXX_STDLIB_FLAG} ${COMPILE_FLAGS} ${LLVM_DEFINITIONS}")
50set(LLVM_BUILD_SYSTEM cmake)
51set(LLVM_HAS_RTTI ${LLVM_CONFIG_HAS_RTTI})
52set(LLVM_DYLIB_VERSION "${LLVM_VERSION_MAJOR}${LLVM_VERSION_SUFFIX}")
53
54# Use the C++ link flags, since they should be a superset of C link flags.
55set(LLVM_LDFLAGS "${CMAKE_CXX_LINK_FLAGS}")
56set(LLVM_BUILDMODE ${CMAKE_BUILD_TYPE})
57set(LLVM_SYSTEM_LIBS ${SYSTEM_LIBS})
58string(REPLACE ";" " " LLVM_TARGETS_BUILT "${LLVM_TARGETS_TO_BUILD}")
59llvm_canonicalize_cmake_booleans(
60  LLVM_BUILD_LLVM_DYLIB
61  LLVM_LINK_LLVM_DYLIB
62  LLVM_HAS_RTTI
63  BUILD_SHARED_LIBS)
64llvm_expand_pseudo_components(LLVM_DYLIB_COMPONENTS_expanded "${LLVM_DYLIB_COMPONENTS}")
65configure_file(${BUILDVARIABLES_SRCPATH} ${BUILDVARIABLES_OBJPATH} @ONLY)
66
67# Set build-time environment(s).
68add_definitions(-DCMAKE_CFG_INTDIR="${CMAKE_CFG_INTDIR}")
69
70if(LLVM_ENABLE_MODULES)
71  target_compile_options(llvm-config PUBLIC
72    "-fmodules-ignore-macro=CMAKE_CFG_INTDIR"
73    )
74endif()
75
76# Add the dependency on the generation step.
77add_file_dependencies(${CMAKE_CURRENT_SOURCE_DIR}/llvm-config.cpp ${BUILDVARIABLES_OBJPATH})
78
79if(CMAKE_CROSSCOMPILING AND NOT LLVM_CONFIG_PATH)
80  build_native_tool(llvm-config LLVM_CONFIG_PATH)
81  set(LLVM_CONFIG_PATH "${LLVM_CONFIG_PATH}" CACHE STRING "")
82
83  add_custom_target(NativeLLVMConfig DEPENDS ${LLVM_CONFIG_PATH})
84  add_dependencies(llvm-config NativeLLVMConfig)
85endif()
86