================
@@ -0,0 +1,97 @@
+# check if we have the right linker flags to enable Arm64X
+include(CheckLinkerFlag)
+check_linker_flag(CXX "LINKER:/linkreprofullpathrsp:test_rsp"
LIBOMP_HAVE_LINKREPROFULLPATHRSP_FLAG)
+if(NOT LIBOMP_HAVE_LINKREPROFULLPATHRSP_FLAG)
+ message(FATAL_ERROR "Arm64X builds are enabled but the linker does not
support the required flag. "
+ "Either update Visual Studio if using link.exe or add lld to
LLVM_ENABLE_PROJECTS to use a newer lld.")
+endif()
+
+# directory where the link.rsp file generated during arm64 build will be stored
+set(arm64ReproDir "${LLVM_BINARY_DIR}/runtimes/repros-arm64ec")
+
+# Don't install the runtime if we are doing an arm64ec build for arm64x.
+# The hybrid arm64x runtime will get installed by the host (default) runtime
build
+if (LIBOMP_ARCH STREQUAL "arm64ec")
+ set(CMAKE_SKIP_INSTALL_RULES On)
+endif()
+
+# This function reads in the content of the rsp file outputted from the
arm64ec build for a target,
+# then passes the arm64ec libs and objs to the linker using /machine:arm64x to
combine them with the
+# arm64 counterparts and create an arm64x binary.
+function(set_arm64ec_dll_dependencies target)
+ set(REPRO_FILE "${arm64ReproDir}/${target}.rsp")
+ file(STRINGS "${REPRO_FILE}" ARM64_OBJS REGEX obj\"$)
+ file(STRINGS "${REPRO_FILE}" ARM64_LIBS REGEX lib\"$)
+ string(REPLACE "\"" ";" ARM64_OBJS "${ARM64_OBJS}")
+ string(REPLACE "\"" ";" ARM64_LIBS "${ARM64_LIBS}")
+
+ get_target_property(libs "${target}" LINK_FLAGS)
+ set(non_def "")
+
+ # Separate out the /def flag from the other link flags, so we can replcae it
with /defArm64Native.
+ foreach(lib ${libs})
+ if(lib MATCHES ".*\.def")
+ string(REPLACE "/DEF:" "" def ${lib})
+ else()
+ list(APPEND non_def "${lib}")
+ endif()
+ endforeach()
+ # Remove the /def link flag
+ set_target_properties("${target}" PROPERTIES LINK_FLAGS "${non_def}")
+
+ target_sources("${target}" PRIVATE ${ARM64_OBJS})
+ target_link_options("${target}" PRIVATE /machine:arm64x
"/def:${arm64ReproDir}/${target}.def" "/defArm64Native:${def}")
+endfunction()
+
+# Replace the /def flag with /defArm64Native and add the arm64ec /def file.
+function(set_arm64ec_lib_dependencies target)
+ get_target_property(opts ${target} STATIC_LIBRARY_OPTIONS)
+ string(REPLACE "/DEF:" "/defArm64Native:" opts "${opts}")
+ set_target_properties(${target} PROPERTIES STATIC_LIBRARY_OPTIONS
"/machine:arm64x;${opts};/def:${arm64ReproDir}/${target}.def")
+endfunction()
+
+# Copy the def file for arm64ec to the repros directory so we can use it in
the arm64x builds and add the linkreprofullpathrsp flag.
+function(handle_arm64ec_target target)
+ get_target_property(type "${target}" TYPE)
+ if(type STREQUAL "SHARED_LIBRARY")
+ get_target_property(libs "${target}" LINK_FLAGS)
+ elseif(type STREQUAL "STATIC_LIBRARY")
+ get_target_property(libs "${target}" STATIC_LIBRARY_OPTIONS)
+ endif()
+ list(FILTER libs INCLUDE REGEX ".*\.def")
+ string(REPLACE "/DEF:" "" def "${libs}")
+
+ add_custom_target("${target}.def"
+ BYPRODUCTS "${arm64ReproDir}/${target}.def"
+ COMMAND ${CMAKE_COMMAND} -E copy
+ "${def}"
+ "${arm64ReproDir}/${target}.def"
+ DEPENDS "${def}")
+ add_dependencies(${target} "${target}.def")
+ # tell the linker to produce this special rsp file that has absolute paths
to its inputs
+ if(type STREQUAL "SHARED_LIBRARY")
+ target_link_options(${target} PRIVATE
"/LINKREPROFULLPATHRSP:${arm64ReproDir}/${target}.rsp")
+ endif()
+endfunction()
+
+# Handle the targets we have requested arm64x builds for.
+function(handle_arm64x)
+ # During the arm64ec build, create rsp files that containes the absolute
path to the inputs passed to the linker (objs, libs).
+ if("${LIBOMP_ARCH}" STREQUAL "arm64ec")
+ file(MAKE_DIRECTORY ${arm64ReproDir})
+ foreach (target ${ARM64X_TARGETS})
+ handle_arm64ec_target("${target}")
+ endforeach()
+
+ # During the ARM64 build, modify the link step appropriately to produce an
arm64x binary
+ elseif("${LIBOMP_ARCH}" STREQUAL "aarch64")
----------------
Meinersbur wrote:
```suggestion
elseif(LIBOMP_ARCH STREQUAL "aarch64")
```
https://github.com/llvm/llvm-project/pull/176157
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