From 273758f6c7918fb9e1683c4281ccf679352e45ea Mon Sep 17 00:00:00 2001
From: Daniel Arndt <arndtd@ornl.gov>
Date: Thu, 20 Apr 2023 16:28:37 -0400
Subject: [PATCH] CMake: Test link inteface again

---
 CMakeLists.txt                                |  4 +-
 .../macro_define_interface_target.cmake       |  4 ++
 cmake/setup_finalize.cmake                    | 64 +++++++++++++++++--
 3 files changed, 64 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d63ad2b955..183c858f9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -111,8 +111,6 @@ foreach(_file ${_check_files})
   verbose_include(${_file})
 endforeach()
 
-verbose_include(${CMAKE_SOURCE_DIR}/cmake/setup_finalize.cmake)
-
 #
 # Feature configuration:
 #
@@ -122,6 +120,8 @@ foreach(_file ${_configure_files})
   verbose_include(${_file})
 endforeach()
 
+verbose_include(${CMAKE_SOURCE_DIR}/cmake/setup_finalize.cmake)
+
 verbose_include(${CMAKE_SOURCE_DIR}/cmake/setup_cpack.cmake)
 verbose_include(${CMAKE_SOURCE_DIR}/cmake/setup_custom_targets.cmake)
 
diff --git a/cmake/macros/macro_define_interface_target.cmake b/cmake/macros/macro_define_interface_target.cmake
index d4b908f667..9569c79447 100644
--- a/cmake/macros/macro_define_interface_target.cmake
+++ b/cmake/macros/macro_define_interface_target.cmake
@@ -144,10 +144,14 @@ function(define_interface_target _feature)
       # Future FIXME: change to block(PARENT_SCOPE)/endblock() (CMake 3.25)
       list(APPEND DEAL_II_TARGETS_${_build} "${_interface_target}")
       set(DEAL_II_TARGETS_${_build} ${DEAL_II_TARGETS_${_build}} PARENT_SCOPE)
+      list(APPEND DEAL_II_LIBRARIES_${_build} "${_libraries}")
+      set(DEAL_II_LIBRARIES_${build} ${DEAL_II_LIBRARIES_${build}} PARENT_SCOPE)
     else()
       # Future FIXME: change to block(PARENT_SCOPE)/endblock() (CMake 3.25)
       list(APPEND DEAL_II_TARGETS "${_interface_target}")
       set(DEAL_II_TARGETS ${DEAL_II_TARGETS} PARENT_SCOPE)
+      list(APPEND DEAL_II_LIBRARIES "${_libraries}")
+      set(DEAL_II_LIBRARIES ${DEAL_II_LIBRARIES} PARENT_SCOPE)
     endif()
 
   endforeach()
diff --git a/cmake/setup_finalize.cmake b/cmake/setup_finalize.cmake
index 6ab2f2890f..20600b3952 100644
--- a/cmake/setup_finalize.cmake
+++ b/cmake/setup_finalize.cmake
@@ -55,12 +55,64 @@ endforeach()
 #
 
 foreach(build ${DEAL_II_BUILD_TYPES})
-  check_compiler_setup(
-    "${DEAL_II_CXX_FLAGS} ${DEAL_II_CXX_FLAGS_${build}}"
-    "${DEAL_II_LINKER_FLAGS} ${DEAL_II_LINKER_FLAGS_${build}}"
-    DEAL_II_HAVE_USABLE_FLAGS_${build}
-    ${DEAL_II_LIBRARIES} ${DEAL_II_LIBRARIES_${build}}
-    )
+  macro(_check_linker_flags)
+    check_compiler_setup(
+      "${DEAL_II_CXX_FLAGS} ${DEAL_II_CXX_FLAGS_${build}}"
+      "${DEAL_II_LINKER_FLAGS} ${DEAL_II_LINKER_FLAGS_${build}}"
+      DEAL_II_HAVE_USABLE_FLAGS_${build}
+      ${DEAL_II_LIBRARIES} ${DEAL_II_LIBRARIES_${build}}
+      )
+  endmacro()
+
+  macro(_drop_linker_flag _linker_flag _replacement_flag _variable)
+    message(STATUS
+      "Unable to compile a simple test program. "
+      "Trying to drop \"${_linker_flag}\" from the linker flags."
+      )
+    foreach(_flags
+        DEAL_II_LINKER_FLAGS DEAL_II_LINKER_FLAGS_${build}
+        BASE_LINKER_FLAGS BASE_LINKER_FLAGS_${build}
+        )
+      string(REPLACE "${_linker_flag}" "${_replacement_flag}"
+        ${_flags} "${${_flags}}"
+        )
+    endforeach()
+    set(${_variable} FALSE CACHE INTERNAL "" FORCE)
+    set(${_variable} FALSE)
+  endmacro()
+
+  _check_linker_flags()
+
+  if(NOT DEAL_II_HAVE_USABLE_FLAGS_${build} AND DEAL_II_COMPILER_HAS_FUSE_LD_LLD)
+    set(_replacement "")
+    if(DEAL_II_COMPILER_HAS_FUSE_LD_GOLD)
+      set(_replacement "-fuse-ld=gold")
+    endif()
+    _drop_linker_flag(
+      "-fuse-ld=lld" ${_replacement}
+      DEAL_II_COMPILER_HAS_FUSE_LD_LLD
+      )
+    _check_linker_flags()
+  endif()
+
+  if(NOT DEAL_II_HAVE_USABLE_FLAGS_${build} AND DEAL_II_COMPILER_HAS_FUSE_LD_GOLD)
+    _drop_linker_flag(
+      "-fuse-ld=gold" ""
+      DEAL_II_COMPILER_HAS_FUSE_LD_GOLD
+      )
+    _check_linker_flags()
+  endif()
+
+  if(NOT DEAL_II_HAVE_USABLE_FLAGS_${build})
+    message(FATAL_ERROR "
+  Configuration error: Cannot compile a test program with the final set of
+  compiler and linker flags:
+    CXX flags (${build}): ${DEAL_II_CXX_FLAGS} ${DEAL_II_CXX_FLAGS_${build}}
+    LD flags  (${build}): ${DEAL_II_LINKER_FLAGS} ${DEAL_II_LINKER_FLAGS_${build}}
+    LIBRARIES (${build}): ${DEAL_II_LIBRARIES};${DEAL_II_LIBRARIES_${build}}
+  \n\n"
+      )
+  endif()
 endforeach()
 
 #
-- 
2.39.5