Add LTO and gold plugin to the CMake build. Linux-only, support for

other systems pending.

PR9456.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127466 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 58 insertions, 0 deletions

diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index 2f37911d251..72364618b36 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -46,6 +46,14 @@ add_subdirectory(llvm-stub)
 add_subdirectory(edis)
 add_subdirectory(llvmc)
 
+if( LLVM_ENABLE_PIC )
+  # TODO: support other systems:
+  if( CMAKE_SYSTEM_NAME STREQUAL "Linux" )
+    add_subdirectory(lto)
+    add_subdirectory(gold)
+  endif()
+endif()
+
 if( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/clang/CMakeLists.txt )
   add_subdirectory( ${CMAKE_CURRENT_SOURCE_DIR}/clang )
 endif( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/clang/CMakeLists.txt )
diff --git a/tools/gold/CMakeLists.txt b/tools/gold/CMakeLists.txt
new file mode 100644
index 00000000000..ca3ce457d70
--- /dev/null
+++ b/tools/gold/CMakeLists.txt
@@ -0,0 +1,37 @@
+set(LLVM_BINUTILS_INCDIR "/usr/include" CACHE PATH
+  "PATH to binutils/include containing plugin-api.h for gold plugin.")
+
+if( NOT EXISTS "${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 ${srcexp}
+    VERBATIM
+    COMMENT "Creating export file for gold plugin")
+  add_custom_target(gold_exports DEPENDS exportsfile)
+  set_property(DIRECTORY APPEND
+    PROPERTY ADDITIONAL_MAKE_CLEAN_FILES exportsfile)
+
+  target_link_libraries(LLVMgold LTO -Wl,--version-script,exportsfile)
+  add_dependencies(LLVMgold gold_exports)
+endif()
diff --git a/tools/lto/CMakeLists.txt b/tools/lto/CMakeLists.txt
new file mode 100644
index 00000000000..a316ef788e6
--- /dev/null
+++ b/tools/lto/CMakeLists.txt
@@ -0,0 +1,13 @@
+set(LLVM_LINK_COMPONENTS ipo scalaropts linker bitreader bitwriter)
+
+add_definitions( -DLLVM_VERSION_INFO=\"${PACKAGE_VERSION}\" )
+
+# TODO: build a static library too.
+set(BUILD_SHARED_LIBS ON)
+
+add_llvm_library(LTO
+  LTOCodeGenerator.cpp
+  lto.cpp
+  LTOModule.cpp
+  )
+