Set CMake ADDITIONAL_HEADER_DIRS on libraries with headers in /include. NFC.

In a UI such as XCode, it can group the headers for a library with that library.
This is done in the CMakeLists.txt for the library itself by setting the path(s)
as ADDITIONAL_HEADER_DIRS.

LLVM already does this for all of its libraries, so just adding this to lld to
make things easier.  Should be NFC.

llvm-svn: 257002

lld/CMakeLists.txt

@@ -1,4 +1,5 @@
 set(LLD_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+set(LLD_INCLUDE_DIR ${LLD_SOURCE_DIR}/include )
 set(LLD_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
 
 # Compute the LLD version from the LLVM version.

lld/lib/Config/CMakeLists.txt

@@ -1,5 +1,9 @@
 add_lld_library(lldConfig
   Version.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLD_INCLUDE_DIR}/lld/Config
+
   LINK_LIBS
     LLVMSupport
   )

lld/lib/Core/CMakeLists.txt

@@ -7,6 +7,10 @@ add_lld_library(lldCore
   Resolver.cpp
   SymbolTable.cpp
   Writer.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLD_INCLUDE_DIR}/lld/Core
+
   LINK_LIBS
     LLVMSupport
   )

lld/lib/Driver/CMakeLists.txt

@@ -14,6 +14,10 @@ add_lld_library(lldDriver
   Driver.cpp
   GnuLdDriver.cpp
   UniversalDriver.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLD_INCLUDE_DIR}/lld/Driver
+
   LINK_LIBS
     lldConfig
     lldMachO

lld/lib/ReaderWriter/CMakeLists.txt

@@ -10,6 +10,10 @@ add_lld_library(lldReaderWriter
   CoreLinkingContext.cpp
   FileArchive.cpp
   LinkerScript.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLD_INCLUDE_DIR}/lld/ReaderWriter
+
   LINK_LIBS
     lldCore
     lldYAML