[AIX] Update rpath for BUILD_SHARED_LIBS

BUILD_SHARED_LIBS build llvm component as shared library,
which can reduce the size a lot.

Normally, the binary use ORIGIN../lib to load component libraries,
unfortunatly, ORIGIN is not supported by AIX ld.

We hardcoded the build lib and install lib path in rpath for now
to enable BUILD_SHARED_LIBS build.

Understand that this is not perfect solution,
we can update this when we find better solution.

Reviewed By: hubert.reinterpretcast

Differential Revision: https://reviews.llvm.org/D98901

diff --git a/llvm/cmake/modules/AddLLVM.cmake b/llvm/cmake/modules/AddLLVM.cmake
index da1b78b..2f055c7 100644 (file)
--- a/llvm/cmake/modules/AddLLVM.cmake
+++ b/llvm/cmake/modules/AddLLVM.cmake
@@ -2105,6 +2105,12 @@ function(llvm_setup_rpath name)
   if (APPLE)
     set(_install_name_dir INSTALL_NAME_DIR "@rpath")
     set(_install_rpath "@loader_path/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
+  elseif(${CMAKE_SYSTEM_NAME} MATCHES "AIX" AND BUILD_SHARED_LIBS)
+    # $ORIGIN is not interpreted at link time by aix ld.
+    # Since BUILD_SHARED_LIBS is only recommended for use by developers,
+    # hardcode the rpath to build/install lib dir first in this mode.
+    # FIXME: update this when there is better solution.
+    set(_install_rpath "${LLVM_LIBRARY_OUTPUT_INTDIR}" "${CMAKE_INSTALL_PREFIX}/lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
   elseif(UNIX)
     set(_install_rpath "\$ORIGIN/../lib${LLVM_LIBDIR_SUFFIX}" ${extra_libdir})
     if(${CMAKE_SYSTEM_NAME} MATCHES "(FreeBSD|DragonFly)")

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index c250a77..0c575b6 100644 (file)
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -212,6 +212,11 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "AIX")
     append("-bcdtors:mbr"
            CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
   endif()
+  if(BUILD_SHARED_LIBS)
+    # See rpath handling in AddLLVM.cmake
+    # FIXME: Remove this warning if this rpath is no longer hardcoded.
+    message(WARNING "Build and install environment path info may be exposed; binaries will also be unrelocatable.")
+  endif()
 endif()
 
 # Pass -Wl,-z,defs. This makes sure all symbols are defined. Otherwise a DSO