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set(LLVM_BINUTILS_INCDIR "" CACHE PATH
"PATH to binutils/include containing plugin-api.h for gold plugin.")
if( NOT LLVM_BINUTILS_INCDIR )
# Nothing to say.
elseif( NOT EXISTS "${LLVM_BINUTILS_INCDIR}/plugin-api.h" )
message(STATUS "plugin-api.h not found. gold plugin excluded from the build.")
else()
include_directories( ${LLVM_BINUTILS_INCDIR} )
# Because off_t is used in the public API, the largefile parts are required for
# ABI compatibility.
add_definitions( -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 )
set(LLVM_LINK_COMPONENTS support)
add_llvm_loadable_module(LLVMgold
gold-plugin.cpp
)
# Makefile.rules contains a special cases for OpenBSD, Darwin and
# Windows. We restrict ourselves to Linux for the time being.
set(srcexp ${CMAKE_CURRENT_SOURCE_DIR}/gold.exports)
add_custom_command(OUTPUT exportsfile
COMMAND echo "{" > exportsfile
COMMAND grep -q "\\<" ${srcexp} && echo " global:" >> exportsfile || :
COMMAND sed -e "s/$/;/" -e "s/^/ /" < ${srcexp} >> exportsfile
COMMAND echo " local: *;" >> exportsfile
COMMAND echo "};" >> exportsfile
DEPENDS ${srcexp}
VERBATIM
COMMENT "Creating export file for gold plugin")
add_custom_target(gold_exports DEPENDS exportsfile)
set_property(DIRECTORY APPEND
PROPERTY ADDITIONAL_MAKE_CLEAN_FILES exportsfile)
# Force re-linking when the exports file changes. Actually, it
# forces recompilation of gold-plugin.cpp. The LINK_DEPENDS target
# property only works for makefile-based generators.
set_property(SOURCE gold-plugin.cpp APPEND PROPERTY
OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/exportsfile)
target_link_libraries(LLVMgold LTO
-Wl,--version-script,${CMAKE_CURRENT_BINARY_DIR}/exportsfile)
add_dependencies(LLVMgold gold_exports)
endif()
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