[PATCH] D61804: Support building shared and static libraries simultaneously

[Wink Saville via Phabricator via llvm-commits]

winksaville added a comment.

@beanz I found what I think is the reason libclang_shared.so isn't being created.

I added a bunch of debug output using `message` to add_llvm_subdirectory:

  1041	function(add_llvm_subdirectory project type name)
  1042	  message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}:+")
  1043	  set(add_llvm_external_dir "${ARGN}")
  1044	  if("${add_llvm_external_dir}" STREQUAL "")
  1045	    message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 1")
  1046	    set(add_llvm_external_dir ${name})
  1047	  endif()
  1048	  canonicalize_tool_name(${name} nameUPPER)
  1049	  set(canonical_full_name ${project}_${type}_${nameUPPER})
  1050	  get_property(already_processed GLOBAL PROPERTY ${canonical_full_name}_PROCESSED)
  1051	  if(already_processed)
  1052	    message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}:- already_processed")
  1053	    return()
  1054	  endif()
  1055	  set_property(GLOBAL PROPERTY ${canonical_full_name}_PROCESSED YES)
  1056	  message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 1.1 canonical_full_name=${canonical_full_name} nameUPPER=${nameUPPER}")
  1057	
  1058	  if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${add_llvm_external_dir}/CMakeLists.txt)
  1059	    message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 2")
  1060	    # Treat it as in-tree subproject.
  1061	    option(${canonical_full_name}_BUILD
  1062	           "Whether to build ${name} as part of ${project}" On)
  1063	    mark_as_advanced(${project}_${type}_${name}_BUILD)
  1064	    if(${canonical_full_name}_BUILD)
  1065	      add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${add_llvm_external_dir} ${add_llvm_external_dir})
  1066	    endif()
  1067	  else()
  1068	    set(LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR
  1069	      "${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}"
  1070	      CACHE PATH "Path to ${name} source directory")
  1071	    message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3 LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR=\"${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}\"")
  1072	    set(${canonical_full_name}_BUILD_DEFAULT ON)
  1073	    if(NOT LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR OR NOT EXISTS ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR})
  1074	      set(${canonical_full_name}_BUILD_DEFAULT OFF)
  1075	      message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.1 ${canonical_full_name}_BUILD_DEFAULT=${${canonical_full_name}_BUILD_DEFAULT}")
  1076	    endif()
  1077	    if("${LLVM_EXTERNAL_${nameUPPER}_BUILD}" STREQUAL "OFF")
  1078	      set(${canonical_full_name}_BUILD_DEFAULT OFF)
  1079	      message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.2 ${LLVM_EXTERNAL_${nameUPPER}_BUILD} ${canonical_full_name}_BUILD_DEFAULT=${${canonical_full_name}_BUILD_DEFAULT}")
  1080	    endif()
  1081	    option(${canonical_full_name}_BUILD
  1082	      "Whether to build ${name} as part of LLVM"
  1083	      ${${canonical_full_name}_BUILD_DEFAULT})
  1084	    message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.3 ${canonical_full_name}_BUILD=${${canonical_full_name}_BUILD}")
  1085	    if (${canonical_full_name}_BUILD)
  1086	      message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.4")
  1087	      if(EXISTS ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR})
  1088	        message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.4.1")
  1089	        add_subdirectory(${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR} ${add_llvm_external_dir})
  1090	      elseif(NOT "${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}" STREQUAL "")
  1091	        message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.4.2")
  1092	        message(WARNING "Nonexistent directory for ${name}: ${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}")
  1093	      endif()
  1094	      message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.4.99")
  1095	    endif()
  1096	    message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}: 3.99")
  1097	  endif()
  1098	  message(STATUS "add_llvm_subdirectory ${project} ${type} ${name}:-")
  1099	endfunction()

The typical output when adding a subdirectory is:

  -- add_llvm_subdirectory CLANG TOOL clang-refactor:+
  -- add_llvm_subdirectory CLANG TOOL clang-refactor: 1
  -- add_llvm_subdirectory CLANG TOOL clang-refactor: 1.1 canonical_full_name=CLANG_TOOL_CLANG_REFACTOR nameUPPER=CLANG_REFACTOR
  -- add_llvm_subdirectory CLANG TOOL clang-refactor: 2
  -- add_llvm_subdirectory CLANG TOOL clang-refactor:-

Where at line 1058 the clause `if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${add_llvm_external_dir}/CMakeLists.txt)`
is TRUE and we go through path `2`; lines 1059 - 1066.

The only time we don't go though path 2 is clang-shlib which goes though path 3,  lines 1068 - 1096.
In that case we endup with CLANG_TOOL_CLANG_SHLIB_BUILD_DEFAULT=OFF
and CLANG_TOOL_CLANG_SHLIB_BUILD=OFF so libclang_shared.so isn't built:

  -- add_llvm_subdirectory CLANG TOOL clang-shlib:+
  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 1
  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 1.1 canonical_full_name=CLANG_TOOL_CLANG_SHLIB nameUPPER=CLANG_SHLIB
  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 3 LLVM_EXTERNAL_CLANG_SHLIB_SOURCE_DIR=""
  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 3.1 CLANG_TOOL_CLANG_SHLIB_BUILD_DEFAULT=OFF
  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 3.3 CLANG_TOOL_CLANG_SHLIB_BUILD=OFF
  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 3.99
  -- add_llvm_subdirectory CLANG TOOL clang-shlib:-

Also notice that LLVM_EXTERNAL_CLANG_SHLIB_SOURCE_DIR is empty:

  -- add_llvm_subdirectory CLANG TOOL clang-shlib: 3 LLVM_EXTERNAL_CLANG_SHLIB_SOURCE_DIR=""

It looks weird that LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR is being set to
a deference of itself "${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}":

  1068	    set(LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR
  1069	      "${LLVM_EXTERNAL_${nameUPPER}_SOURCE_DIR}"
  1070	      CACHE PATH "Path to ${name} source directory")

Maybe that's idiom which causes cmake to cache something, but seems odd to me so I thought I'd point it out.

Of course I could be analyzing all of this totally wrong, so help appreciated.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D61804/new/

https://reviews.llvm.org/D61804