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[cmake] Add support for case-sensitive Windows SDKs
When the Windows SDK is hosted on a case-sensitive filesystem (e.g. when compiling on Linux and not using ciopfs), we can automatically generate a VFS overlay for headers and symlinks for libraries. Differential Revision: https://reviews.llvm.org/D41156 llvm-svn: 320657
This commit is contained in:
Shoaib Meenai
parent
0ebe73c608
commit
0d437ee4ce
@ -80,18 +80,9 @@
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#
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# IMPORTANT: In order for this to work, you will need a valid copy of the Windows
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# SDK and C++ STL headers and libraries on your host. Additionally, since the
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# Windows libraries and headers are not case-correct, you will need to have these
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# mounted in a case-insensitive mount. This requires one command to set up.
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#
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# ~/src: mkdir winsdk
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# ~/src: mkdir winsdk.icase
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# ~/src: ciopfs winsdk/ winsdk.icase
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#
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# Now copy or otherwise install your headers and libraries to the winsdk.icase folder
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# and use *that* folder as the path when configuring CMake.
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#
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# TODO: We could also provide a CMake option -DUSE_ICASE_VFS_OVERLAY=ON/OFF that would
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# make this optional. For now, we require ciopfs.
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# Windows libraries and headers are not case-correct, this toolchain file sets
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# up a VFS overlay for the SDK headers and case-correcting symlinks for the
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# libraries when running on a case-sensitive filesystem.
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# When configuring CMake with a toolchain file against a top-level CMakeLists.txt,
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@ -110,6 +101,49 @@ function(init_user_prop prop)
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endif()
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endfunction()
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function(generate_winsdk_vfs_overlay winsdk_include_dir output_path)
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set(include_dirs)
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file(GLOB_RECURSE entries LIST_DIRECTORIES true "${winsdk_include_dir}/*")
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foreach(entry ${entries})
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if(IS_DIRECTORY "${entry}")
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list(APPEND include_dirs "${entry}")
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endif()
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endforeach()
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file(WRITE "${output_path}" "version: 0\n")
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file(APPEND "${output_path}" "case-sensitive: false\n")
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file(APPEND "${output_path}" "roots:\n")
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foreach(dir ${include_dirs})
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file(GLOB headers RELATIVE "${dir}" "${dir}/*.h")
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if(NOT headers)
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continue()
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endif()
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file(APPEND "${output_path}" " - name: \"${dir}\"\n")
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file(APPEND "${output_path}" " type: directory\n")
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file(APPEND "${output_path}" " contents:\n")
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foreach(header ${headers})
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file(APPEND "${output_path}" " - name: \"${header}\"\n")
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file(APPEND "${output_path}" " type: file\n")
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file(APPEND "${output_path}" " external-contents: \"${dir}/${header}\"\n")
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endforeach()
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endforeach()
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endfunction()
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function(generate_winsdk_lib_symlinks winsdk_um_lib_dir output_dir)
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execute_process(COMMAND "${CMAKE_COMMAND}" -E make_directory "${output_dir}")
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file(GLOB libraries RELATIVE "${winsdk_um_lib_dir}" "${winsdk_um_lib_dir}/*")
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foreach(library ${libraries})
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string(TOLOWER "${library}" symlink_name)
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execute_process(COMMAND "${CMAKE_COMMAND}"
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-E create_symlink
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"${winsdk_um_lib_dir}/${library}"
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"${output_dir}/${symlink_name}")
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endforeach()
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endfunction()
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set(CMAKE_SYSTEM_NAME Windows)
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set(CMAKE_SYSTEM_VERSION 10.0)
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set(CMAKE_SYSTEM_PROCESSOR AMD64)
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@ -170,6 +204,13 @@ if(NOT EXISTS "${WINSDK_BASE}" OR
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"Windows SDK installation")
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endif()
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if(NOT EXISTS "${WINSDK_INCLUDE}/um/Windows.h")
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message(SEND_ERROR "Cannot find Windows.h")
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endif()
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if(NOT EXISTS "${WINSDK_INCLUDE}/um/WINDOWS.H")
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set(case_sensitive_filesystem TRUE)
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endif()
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set(CMAKE_C_COMPILER "${LLVM_NATIVE_TOOLCHAIN}/bin/clang-cl" CACHE FILEPATH "")
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set(CMAKE_CXX_COMPILER "${LLVM_NATIVE_TOOLCHAIN}/bin/clang-cl" CACHE FILEPATH "")
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set(CMAKE_LINKER "${LLVM_NATIVE_TOOLCHAIN}/bin/lld-link" CACHE FILEPATH "")
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@ -195,6 +236,18 @@ set(COMPILE_FLAGS
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-imsvc "${WINSDK_INCLUDE}/um"
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-imsvc "${WINSDK_INCLUDE}/winrt")
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if(case_sensitive_filesystem)
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# Ensure all sub-configures use the top-level VFS overlay instead of generating their own.
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init_user_prop(winsdk_vfs_overlay_path)
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if(NOT winsdk_vfs_overlay_path)
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set(winsdk_vfs_overlay_path "${CMAKE_BINARY_DIR}/winsdk_vfs_overlay.yaml")
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generate_winsdk_vfs_overlay("${WINSDK_BASE}/Include/${WINSDK_VER}" "${winsdk_vfs_overlay_path}")
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init_user_prop(winsdk_vfs_overlay_path)
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endif()
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list(APPEND COMPILE_FLAGS
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-Xclang -ivfsoverlay -Xclang "${winsdk_vfs_overlay_path}")
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endif()
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string(REPLACE ";" " " COMPILE_FLAGS "${COMPILE_FLAGS}")
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# We need to preserve any flags that were passed in by the user. However, we
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@ -217,6 +270,18 @@ set(LINK_FLAGS
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-libpath:"${WINSDK_LIB}/ucrt/${WINSDK_ARCH}"
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-libpath:"${WINSDK_LIB}/um/${WINSDK_ARCH}")
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if(case_sensitive_filesystem)
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# Ensure all sub-configures use the top-level symlinks dir instead of generating their own.
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init_user_prop(winsdk_lib_symlinks_dir)
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if(NOT winsdk_lib_symlinks_dir)
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set(winsdk_lib_symlinks_dir "${CMAKE_BINARY_DIR}/winsdk_lib_symlinks")
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generate_winsdk_lib_symlinks("${WINSDK_BASE}/Lib/${WINSDK_VER}/um/${WINSDK_ARCH}" "${winsdk_lib_symlinks_dir}")
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init_user_prop(winsdk_lib_symlinks_dir)
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endif()
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list(APPEND LINK_FLAGS
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-libpath:"${winsdk_lib_symlinks_dir}")
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endif()
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string(REPLACE ";" " " LINK_FLAGS "${LINK_FLAGS}")
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# See explanation for compiler flags above for the _INITIAL variables.
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