Use absolute path to exportsfile in gold plugin CMake build.

[oota-llvm.git] / tools / gold / CMakeLists.txt

diff --git a/tools/gold/CMakeLists.txt b/tools/gold/CMakeLists.txt
index ca3ce457d701662d6edcce0335d737389b119f45..2cc132ff78e4019d126c448b261b1ccbeb30d7ec 100644 (file)
--- a/tools/gold/CMakeLists.txt
+++ b/tools/gold/CMakeLists.txt
@@ -1,7 +1,9 @@
-set(LLVM_BINUTILS_INCDIR "/usr/include" CACHE PATH
+set(LLVM_BINUTILS_INCDIR "" CACHE PATH
   "PATH to binutils/include containing plugin-api.h for gold plugin.")
 
-if( NOT EXISTS "${LLVM_BINUTILS_INCDIR}/plugin-api.h" )
+if( NOT LLVM_BINUTILS_INCDIR )
+  # Nothing to say.
+elseif( NOT EXISTS "${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} )
@@ -22,7 +24,7 @@ else()
   add_custom_command(OUTPUT exportsfile
     COMMAND echo "{" > exportsfile
     COMMAND grep -q "\\<" ${srcexp} && echo "  global:" >> exportsfile || :
-    COMMAND sed -e "s/\$\$/;/" -e "s/^/    /" < ${srcexp} >> exportsfile
+    COMMAND sed -e "s/$/;/" -e "s/^/    /" < ${srcexp} >> exportsfile
     COMMAND echo "  local: *;" >> exportsfile
     COMMAND echo "};" >> exportsfile
     DEPENDS ${srcexp}
@@ -32,6 +34,13 @@ else()
   set_property(DIRECTORY APPEND
     PROPERTY ADDITIONAL_MAKE_CLEAN_FILES exportsfile)
 
-  target_link_libraries(LLVMgold LTO -Wl,--version-script,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()