qtcreatorcdbext: Deploy LLVM only once

In the multi-architecture build we don't need to copy LLVM multiple
times. Otherwise it copies files from the same source to the same target
multiple times in parallel, which can lead to failures.

Change-Id: I7e3f478560ebbb53690cff21d85b881d047a111d
Reviewed-by: David Schulz <david.schulz@qt.io>

src/libs/qtcreatorcdbext/CMakeLists.txt

@@ -8,6 +8,10 @@ set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
+if (NOT DEFINED QTCREATORCDBEXT_INSTALL_LLVM)
+  set(QTCREATORCDBEXT_INSTALL_LLVM YES) # default
+endif()
+
 if (NOT QT_CREATOR_API_DEFINED)
   # standalone build
   include(QtCreatorIDEBranding)
@@ -25,7 +29,7 @@ if (NOT QT_CREATOR_API_DEFINED)
 
     string(REPLACE ";" "|" CMAKE_PREFIX_PATH_ALT_SEP "${CMAKE_PREFIX_PATH}")
 
-    macro (setup_library arch)
+    macro (setup_library arch install_llvm)
       ExternalProject_Add(${arch}-bld
         SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
         CMAKE_GENERATOR "${generator}"
@@ -36,6 +40,7 @@ if (NOT QT_CREATOR_API_DEFINED)
           -DPythonTargetArchDll=${PythonTarget${arch}Dll}
           -DPython3_ROOT_DIR=${Python3_ROOT_DIR}
           -DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH_ALT_SEP}
+          -DQTCREATORCDBEXT_INSTALL_LLVM=${install_llvm}
         BUILD_COMMAND
           ${CMAKE_COMMAND} --build . --config ${CMAKE_BUILD_TYPE}
         INSTALL_COMMAND
@@ -47,8 +52,10 @@ if (NOT QT_CREATOR_API_DEFINED)
     if (NOT QTCREATORCDBEXT_BUILD_ARCHS)
       set(QTCREATORCDBEXT_BUILD_ARCHS arm64 win32 x64)
     endif()
+    set(install_llvm YES)
     foreach(arch IN LISTS QTCREATORCDBEXT_BUILD_ARCHS)
-      setup_library(${arch})
+      setup_library(${arch} ${install_llvm})
+      set(install_llvm NO)
     endforeach()
 
     list(LENGTH QTCREATORCDBEXT_BUILD_ARCHS build_archs_length)
@@ -60,6 +67,7 @@ if (NOT QT_CREATOR_API_DEFINED)
       )
       install(CODE
         "if (EXISTS \"${CMAKE_BINARY_DIR}/bin\")
+          message(\"Copying ${CMAKE_BINARY_DIR}/bin to ${CMAKE_INSTALL_PREFIX}\")
           file(COPY \"${CMAKE_BINARY_DIR}/bin\" DESTINATION \"${CMAKE_INSTALL_PREFIX}\")
          endif()"
         COMPONENT qtcreatorcdbext
@@ -274,6 +282,7 @@ if (_library_enabled)
     VERBATIM
   )
 
+  if (QTCREATORCDBEXT_INSTALL_LLVM)
     # Deploy lldb.exe and its Python dependency
     find_package(Clang QUIET)
     if (LLVM_TOOLS_BINARY_DIR AND LLVM_LIBRARY_DIRS)
@@ -292,5 +301,6 @@ if (_library_enabled)
                 PATTERN _lldb.cp311-win_amd64.pyd EXCLUDE)
       endif()
     endif()
+  endif()
 
 endif()