[cmake] Make dependencies of lldb libraries private, take 2

Summary:
The dependencies of our libraries (only liblldb, really) we marked as public, which caused all
their dependencies to be repeated when linking any executables to them. This is a problem because
then all the .a files could end up being linked twice, once to liblldb and once
again to to the executable linking against liblldb (lldb, lldb-mi). As it turns out,
our build actually depends on this behavior:
- on windows, lldb does not have getopt, so it pulls it from inside liblldb, even
  though getopt is not a part of the exported interface of liblldb (maybe some of
  the bsd variants have this problem as well)
- lldb-mi uses llvm, which again is not exported by liblldb

This change does not actually fix these problems (that is going to be a hard
one), but it does make them explicit by moving this magic from add_lldb_library
to the places the executable targets are defined. That way, I can link the
additional .a files only on targets that really need it, and the other targets
can build cleanly and make sure we don't regress further. It also fixes the
LLVM_LINK_LLVM_DYLIB build on linux.

Reviewers: zturner, beanz

Subscribers: ki.stfu, lldb-commits, mgorny

Differential Revision: https://reviews.llvm.org/D25680

llvm-svn: 284466

lldb/cmake/modules/AddLLDB.cmake

@@ -4,7 +4,7 @@ function(lldb_link_common_libs name targetkind)
   endif()
 
   if(${targetkind} MATCHES "SHARED")
-    set(LINK_KEYWORD PUBLIC)
+    set(LINK_KEYWORD PRIVATE)
   endif()
 
   if(${targetkind} MATCHES "SHARED" OR ${targetkind} MATCHES "EXE")
@@ -56,19 +56,20 @@ macro(add_lldb_library name)
   if (PARAM_OBJECT)
     add_library(${name} ${libkind} ${srcs})
   else()
-    llvm_add_library(${name} ${libkind} DISABLE_LLVM_LINK_LLVM_DYLIB ${srcs})
-
-    lldb_link_common_libs(${name} "${libkind}")
-
     if (PARAM_SHARED)
       if (LLDB_LINKER_SUPPORTS_GROUPS)
-        target_link_libraries(${name} PUBLIC
-                    -Wl,--start-group ${CLANG_USED_LIBS} -Wl,--end-group)
+        llvm_add_library(${name} ${libkind} ${srcs} LINK_LIBS
+                                -Wl,--start-group ${LLDB_USED_LIBS} -Wl,--end-group
+                                -Wl,--start-group ${CLANG_USED_LIBS} -Wl,--end-group
+          )
       else()
-        target_link_libraries(${name} PUBLIC ${CLANG_USED_LIBS})
+        llvm_add_library(${name} ${libkind} ${srcs} LINK_LIBS
+                                ${LLDB_USED_LIBS} ${CLANG_USED_LIBS}
+          )
       endif()
+    else()
+      llvm_add_library(${name} ${libking} ${srcs})
     endif()
-    llvm_config(${name} ${LLVM_LINK_COMPONENTS} ${LLVM_PRIVATE_LINK_COMPONENTS})
 
     if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "liblldb")
       if (PARAM_SHARED)
@@ -101,7 +102,7 @@ endmacro(add_lldb_library)
 
 macro(add_lldb_executable name)
   cmake_parse_arguments(ARG "INCLUDE_IN_FRAMEWORK" "" "" ${ARGN})
-  add_llvm_executable(${name} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARG_UNPARSED_ARGUMENTS})
+  add_llvm_executable(${name} ${ARG_UNPARSED_ARGUMENTS})
   set_target_properties(${name} PROPERTIES
     FOLDER "lldb executables")
 

lldb/source/Plugins/SymbolFile/PDB/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(LLVM_PRIVATE_LINK_COMPONENTS
+set(LLVM_LINK_COMPONENTS
     DebugInfoPDB)
 
 add_lldb_library(lldbPluginSymbolFilePDB

lldb/tools/argdumper/CMakeLists.txt

@@ -1,8 +1,16 @@
+include(${LLDB_PROJECT_ROOT}/cmake/LLDBDependencies.cmake)
+
 add_lldb_executable(lldb-argdumper INCLUDE_IN_FRAMEWORK
   argdumper.cpp
   )
 
-target_link_libraries(lldb-argdumper liblldb)
+if (LLDB_LINKER_SUPPORTS_GROUPS)
+  target_link_libraries(lldb-argdumper -Wl,--start-group ${LLDB_USED_LIBS} -Wl,--end-group)
+else()
+  target_link_libraries(lldb-argdumper ${LLDB_USED_LIBS})
+endif()
+llvm_config(lldb-argdumper ${LLVM_LINK_COMPONENTS})
+
 
 install(TARGETS lldb-argdumper
   RUNTIME DESTINATION bin)

lldb/tools/driver/CMakeLists.txt

@@ -1,3 +1,5 @@
+include(${LLDB_PROJECT_ROOT}/cmake/LLDBDependencies.cmake)
+
 add_lldb_executable(lldb
   Driver.cpp
   Platform.cpp
@@ -18,9 +20,14 @@ if ( LLDB_CAN_USE_DEBUGSERVER )
 endif()
 
 target_link_libraries(lldb liblldb)
-# TODO: why isn't this done by add_lldb_executable?
-#target_link_libraries(lldb ${LLDB_USED_LIBS})
-#llvm_config(lldb ${LLVM_LINK_COMPONENTS})
+if ( CMAKE_SYSTEM_NAME MATCHES "Windows" )
+  # Windows does not have getopt support, so it relies on the one provided by
+  # liblldb. However, getopt is not a part of the liblldb interfact, so we have
+  # to link against the constituent libraries manually. Note that this is
+  # extremely scary as it introduces ODR violations, and it should go away as
+  # soon as possible.
+  target_link_libraries(lldb ${LLDB_USED_LIBS})
+endif()
 
 set_target_properties(lldb PROPERTIES VERSION ${LLDB_VERSION})
 

lldb/tools/lldb-mi/CMakeLists.txt

@@ -1,3 +1,5 @@
+include(${LLDB_PROJECT_ROOT}/cmake/LLDBDependencies.cmake)
+
 set(LLDB_MI_SOURCES
   MICmdArgContext.cpp
   MICmdArgSet.cpp