CUDA: Use the host compiler for linking CUDA executables and shared libs.

Modules/CMakeCUDACompiler.cmake.in

@@ -1,4 +1,6 @@
 set(CMAKE_CUDA_COMPILER "@CMAKE_CUDA_COMPILER@")
+set(CMAKE_CUDA_HOST_COMPILER "@CMAKE_CUDA_HOST_COMPILER@")
+set(CMAKE_CUDA_HOST_LINK_LAUNCHER "@CMAKE_CUDA_HOST_LINK_LAUNCHER@")
 set(CMAKE_CUDA_COMPILER_ID "@CMAKE_CUDA_COMPILER_ID@")
 set(CMAKE_CUDA_COMPILER_VERSION "@CMAKE_CUDA_COMPILER_VERSION@")
 set(CMAKE_CUDA_STANDARD_COMPUTED_DEFAULT "@CMAKE_CUDA_STANDARD_COMPUTED_DEFAULT@")
@@ -8,6 +10,10 @@ set(CMAKE_CUDA_COMPILER_ENV_VAR "CUDACXX")
 set(CMAKE_CUDA_COMPILER_ID_RUN 1)
 set(CMAKE_CUDA_SOURCE_FILE_EXTENSIONS cu)
 
+set(CMAKE_CUDA_HOST_IMPLICIT_LINK_LIBRARIES "@CMAKE_CUDA_HOST_IMPLICIT_LINK_LIBRARIES@")
+set(CMAKE_CUDA_HOST_IMPLICIT_LINK_DIRECTORIES "@CMAKE_CUDA_HOST_IMPLICIT_LINK_DIRECTORIES@")
+set(CMAKE_CUDA_HOST_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "@CMAKE_CUDA_HOST_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES@")
+
 set(CMAKE_CUDA_IMPLICIT_LINK_LIBRARIES "@CMAKE_CUDA_IMPLICIT_LINK_LIBRARIES@")
 set(CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES "@CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES@")
 set(CMAKE_CUDA_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES "@CMAKE_CUDA_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES@")

Modules/CMakeCUDAInformation.cmake

@@ -60,15 +60,27 @@ include(CMakeCommonLanguageInclude)
 # CMAKE_CUDA_LINK_EXECUTABLE
 
 if(CMAKE_CUDA_HOST_COMPILER)
-  set(CMAKE_CUDA_HOST_FLAGS "-ccbin \"${CMAKE_CUDA_HOST_COMPILER}\" ")
+  set(CMAKE_CUDA_HOST_FLAGS "-ccbin=<CMAKE_CUDA_HOST_COMPILER>")
 else()
   set(CMAKE_CUDA_HOST_FLAGS "")
 endif()
 
+set(__IMPLICT_LINKS )
+foreach(dir ${CMAKE_CUDA_HOST_IMPLICIT_LINK_DIRECTORIES})
+  string(APPEND __IMPLICT_LINKS " -L\"${dir}\"")
+endforeach()
+foreach(lib ${CMAKE_CUDA_HOST_IMPLICIT_LINK_LIBRARIES})
+  if(${lib} MATCHES "/")
+    string(APPEND __IMPLICT_LINKS " \"${lib}\"")
+  else()
+    string(APPEND __IMPLICT_LINKS " -l${lib}")
+  endif()
+endforeach()
+
 # create a shared library
 if(NOT CMAKE_CUDA_CREATE_SHARED_LIBRARY)
   set(CMAKE_CUDA_CREATE_SHARED_LIBRARY
-      "<CMAKE_CUDA_COMPILER> ${CMAKE_CUDA_HOST_FLAGS} <CMAKE_SHARED_LIBRARY_CUDA_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CUDA_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
+      "<CMAKE_CUDA_HOST_LINK_LAUNCHER> <CMAKE_SHARED_LIBRARY_CUDA_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CUDA_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>${__IMPLICT_LINKS}")
 endif()
 
 # create a shared module copy the shared library rule by default
@@ -110,7 +122,7 @@ endif()
 # compile a cu file into an executable
 if(NOT CMAKE_CUDA_LINK_EXECUTABLE)
   set(CMAKE_CUDA_LINK_EXECUTABLE
-    "<CMAKE_CUDA_COMPILER> ${CMAKE_CUDA_HOST_FLAGS} <FLAGS> <CMAKE_CUDA_LINK_FLAGS> <LINK_FLAGS> <OBJECTS>  -o <TARGET> <LINK_LIBRARIES>")
+    "<CMAKE_CUDA_HOST_LINK_LAUNCHER> <CMAKE_CUDA_LINK_FLAGS> <LINK_FLAGS> <OBJECTS>  -o <TARGET> <LINK_LIBRARIES>${__IMPLICT_LINKS}")
 endif()
 
 

Modules/CMakeDetermineCUDACompiler.cmake

@@ -2,6 +2,7 @@
 # file Copyright.txt or https://cmake.org/licensing for details.
 
 include(${CMAKE_ROOT}/Modules/CMakeDetermineCompiler.cmake)
+include(${CMAKE_ROOT}/Modules//CMakeParseImplicitLinkInfo.cmake)
 
 if( NOT ( ("${CMAKE_GENERATOR}" MATCHES "Make") OR
           ("${CMAKE_GENERATOR}" MATCHES "Ninja") ) )
@@ -43,12 +44,9 @@ if(NOT CMAKE_CUDA_COMPILER_ID_RUN)
   set(CMAKE_CXX_COMPILER_ID_TOOL_MATCH_REGEX "\nLd[^\n]*(\n[ \t]+[^\n]*)*\n[ \t]+([^ \t\r\n]+)[^\r\n]*-o[^\r\n]*CompilerIdCUDA/(\\./)?(CompilerIdCUDA.xctest/)?CompilerIdCUDA[ \t\n\\\"]")
   set(CMAKE_CXX_COMPILER_ID_TOOL_MATCH_INDEX 2)
 
+  set(CMAKE_CUDA_COMPILER_ID_FLAGS_ALWAYS "-v")
   if(CMAKE_CUDA_HOST_COMPILER)
-      # Each entry in this list is a set of extra flags to try
-      # adding to the compile line to see if it helps produce
-      # a valid identification file. In our case this would just
-      # be the explicit host compiler
-      set(CMAKE_CUDA_COMPILER_ID_TEST_FLAGS_FIRST "-ccbin=${CMAKE_CUDA_HOST_COMPILER}")
+      list(APPEND CMAKE_CUDA_COMPILER_ID_FLAGS_ALWAYS "-ccbin=${CMAKE_CUDA_HOST_COMPILER}")
   endif()
 
   include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
@@ -57,6 +55,40 @@ endif()
 
 include(CMakeFindBinUtils)
 
+#if this compiler vendor is matches NVIDIA we can determine
+#what the host compiler is. This only needs to be done if the CMAKE_CUDA_HOST_COMPILER
+#has NOT been explicitly set
+#
+#Find the line from compiler ID that contains a.out ( or last line )
+#We also need to find the implicit link lines. Which can be done by replacing
+#the compiler with cuda-fake-ld  and pass too CMAKE_PARSE_IMPLICIT_LINK_INFO
+if(CMAKE_CUDA_COMPILER_ID STREQUAL NVIDIA)
+  #grab the last line of the output which holds the link line
+  string(REPLACE "#\$ " ";" nvcc_output "${CMAKE_CUDA_COMPILER_PRODUCED_OUTPUT}")
+  list(GET nvcc_output -1 nvcc_output)
+
+  #extract the compiler that is being used for linking
+  string(REPLACE " " ";" nvcc_output_to_find_launcher "${nvcc_output}")
+  list(GET nvcc_output_to_find_launcher 0 CMAKE_CUDA_HOST_LINK_LAUNCHER)
+  #we need to remove the quotes that nvcc adds around the directory section
+  #of the path
+  string(REPLACE "\"" "" CMAKE_CUDA_HOST_LINK_LAUNCHER "${CMAKE_CUDA_HOST_LINK_LAUNCHER}")
+
+  #prefix the line with cuda-fake-ld so that implicit link info believes it is
+  #a link line
+  set(nvcc_output "cuda-fake-ld ${nvcc_output}")
+  CMAKE_PARSE_IMPLICIT_LINK_INFO("${nvcc_output}"
+                                 CMAKE_CUDA_HOST_IMPLICIT_LINK_LIBRARIES
+                                 CMAKE_CUDA_HOST_IMPLICIT_LINK_DIRECTORIES
+                                 CMAKE_CUDA_HOST_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES
+                                 log
+                                 "${CMAKE_CUDA_IMPLICIT_OBJECT_REGEX}")
+
+  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
+          "Parsed CUDA nvcc implicit link information from above output:\n${log}\n\n")
+
+endif()
+
 # configure all variables set in this file
 configure_file(${CMAKE_ROOT}/Modules/CMakeCUDACompiler.cmake.in
   ${CMAKE_PLATFORM_INFO_DIR}/CMakeCUDACompiler.cmake

Modules/CMakeDetermineCompilerId.cmake

@@ -101,6 +101,8 @@ function(CMAKE_DETERMINE_COMPILER_ID lang flagvar src)
   set(CMAKE_${lang}_SIMULATE_ID "${CMAKE_${lang}_SIMULATE_ID}" PARENT_SCOPE)
   set(CMAKE_${lang}_SIMULATE_VERSION "${CMAKE_${lang}_SIMULATE_VERSION}" PARENT_SCOPE)
   set(CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT "${CMAKE_${lang}_STANDARD_COMPUTED_DEFAULT}" PARENT_SCOPE)
+  set(CMAKE_${lang}_COMPILER_PRODUCED_OUTPUT "${COMPILER_${lang}_PRODUCED_OUTPUT}" PARENT_SCOPE)
+  set(CMAKE_${lang}_COMPILER_PRODUCED_FILES "${COMPILER_${lang}_PRODUCED_FILES}" PARENT_SCOPE)
 endfunction()
 
 include(CMakeCompilerIdDetection)
@@ -135,7 +137,7 @@ function(CMAKE_DETERMINE_COMPILER_ID_BUILD lang testflags src)
   set(COMPILER_DESCRIPTION
     "Compiler: ${CMAKE_${lang}_COMPILER} ${CMAKE_${lang}_COMPILER_ID_ARG1}
 Build flags: ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
-Id flags: ${testflags}
+Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
 ")
 
   # Compile the compiler identification source.
@@ -322,6 +324,7 @@ Id flags: ${testflags}
               ${CMAKE_${lang}_COMPILER_ID_ARG1}
               ${CMAKE_${lang}_COMPILER_ID_FLAGS_LIST}
               ${testflags}
+              ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
               "${src}"
       WORKING_DIRECTORY ${CMAKE_${lang}_COMPILER_ID_DIR}
       OUTPUT_VARIABLE CMAKE_${lang}_COMPILER_ID_OUTPUT
@@ -400,6 +403,7 @@ ${CMAKE_${lang}_COMPILER_ID_OUTPUT}
   # Return the files produced by the compilation.
   set(COMPILER_${lang}_PRODUCED_FILES "${COMPILER_${lang}_PRODUCED_FILES}" PARENT_SCOPE)
   set(COMPILER_${lang}_PRODUCED_OUTPUT "${COMPILER_${lang}_PRODUCED_OUTPUT}" PARENT_SCOPE)
+
 endfunction()
 
 #-----------------------------------------------------------------------------

Modules/Compiler/NVIDIA-CUDA.cmake

@@ -1,9 +1,11 @@
-set(CMAKE_CUDA_VERBOSE_FLAG "-v -Xcompiler=-v")
+set(CMAKE_CUDA_VERBOSE_FLAG "-v")
 
 
 set(CMAKE_CUDA_COMPILE_OPTIONS_PIE -Xcompiler=-fPIE)
 set(CMAKE_CUDA_COMPILE_OPTIONS_PIC -Xcompiler=-fPIC)
-set(CMAKE_SHARED_LIBRARY_CUDA_FLAGS -Xcompiler=-fPIC)
+#CMAKE_SHARED_LIBRARY_CUDA_FLAGS is sent to the host linker so we don' need
+#to forward it through nvcc
+set(CMAKE_SHARED_LIBRARY_CUDA_FLAGS -fPIC)
 set(CMAKE_SHARED_LIBRARY_CREATE_CUDA_FLAGS -shared)
 set(CMAKE_INCLUDE_SYSTEM_FLAG_CUDA -isystem=)
 set(CMAKE_CUDA_COMPILE_OPTIONS_VISIBILITY -Xcompiler=-fvisibility=)

Source/cmCoreTryCompile.cxx

@@ -44,8 +44,6 @@ static std::string const kCMAKE_TRY_COMPILE_OSX_ARCHITECTURES =
   "CMAKE_TRY_COMPILE_OSX_ARCHITECTURES";
 static std::string const kCMAKE_TRY_COMPILE_PLATFORM_VARIABLES =
   "CMAKE_TRY_COMPILE_PLATFORM_VARIABLES";
-static std::string const kCMAKE_CUDA_HOST_COMPILER =
-  "CMAKE_CUDA_HOST_COMPILER";
 
 int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv,
                                      bool isTryRun)
@@ -455,7 +453,6 @@ int cmCoreTryCompile::TryCompileCode(std::vector<std::string> const& argv,
       vars.insert(kCMAKE_OSX_SYSROOT);
       vars.insert(kCMAKE_POSITION_INDEPENDENT_CODE);
       vars.insert(kCMAKE_SYSROOT);
-      vars.insert(kCMAKE_CUDA_HOST_COMPILER);
 
       if (const char* varListStr = this->Makefile->GetDefinition(
             kCMAKE_TRY_COMPILE_PLATFORM_VARIABLES)) {

Source/cmLocalGenerator.cxx

@@ -63,6 +63,8 @@ static const char* ruleReplaceVars[] = {
   "CMAKE_CURRENT_BINARY_DIR",
   "CMAKE_RANLIB",
   "CMAKE_LINKER",
+  "CMAKE_CUDA_HOST_COMPILER",
+  "CMAKE_CUDA_HOST_LINK_LAUNCHER",
   "CMAKE_CL_SHOWINCLUDES_PREFIX"
 };