4 files changed, 31 insertions, 15 deletions
diff --git a/Modules/CMakeDetermineCompilerId.cmake b/Modules/CMakeDetermineCompilerId.cmake
index b38de8a..fa283fe 100644
--- a/Modules/CMakeDetermineCompilerId.cmake
+++ b/Modules/CMakeDetermineCompilerId.cmake
@@ -539,7 +539,8 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
     else()
       set(id_toolset "")
     endif()
-    if("${lang}" STREQUAL "Swift")
+    set(id_lang_version "")
+    if("x${lang}" STREQUAL "xSwift")
       if(CMAKE_Swift_LANGUAGE_VERSION)
         set(id_lang_version "SWIFT_VERSION = ${CMAKE_Swift_LANGUAGE_VERSION};")
       elseif(XCODE_VERSION VERSION_GREATER_EQUAL 10.2)
@@ -549,8 +550,14 @@ Id flags: ${testflags} ${CMAKE_${lang}_COMPILER_ID_FLAGS_ALWAYS}
       else()
         set(id_lang_version "SWIFT_VERSION = 2.3;")
       endif()
-    else()
-      set(id_lang_version "")
+    elseif("x${lang}" STREQUAL "xC" OR "x${lang}" STREQUAL "xOBJC")
+      if(CMAKE_${lang}_COMPILER_ID_FLAGS MATCHES "(^| )(-std=[^ ]+)( |$)")
+        set(id_lang_version "OTHER_CFLAGS = \"${CMAKE_MATCH_2}\";")
+      endif()
+    elseif("x${lang}" STREQUAL "xCXX" OR "x${lang}" STREQUAL "xOBJCXX")
+      if(CMAKE_${lang}_COMPILER_ID_FLAGS MATCHES "(^| )(-std=[^ ]+)( |$)")
+        set(id_lang_version "OTHER_CPLUSPLUSFLAGS = \"${CMAKE_MATCH_2}\";")
+      endif()
     endif()
     if(CMAKE_OSX_DEPLOYMENT_TARGET)
       set(id_deployment_target
diff --git a/Modules/Compiler/NVHPC-C.cmake b/Modules/Compiler/NVHPC-C.cmake
index e37aad5..9295abd 100644
--- a/Modules/Compiler/NVHPC-C.cmake
+++ b/Modules/Compiler/NVHPC-C.cmake
@@ -9,4 +9,15 @@ if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 20.11)
   set(CMAKE_C17_EXTENSION_COMPILE_OPTION -std=gnu17)
 endif()
 
+if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 21.07)
+  set(CMAKE_DEPFILE_FLAGS_C "-MD -MT <DEP_TARGET> -MF <DEP_FILE>")
+  set(CMAKE_C_DEPFILE_FORMAT gcc)
+  set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
+else()
+  # Before NVHPC 21.07 the `-MD` flag implicitly
+  # implies `-E` and therefore compilation and dependency generation
+  # can't occur in the same invocation
+  set(CMAKE_C_DEPENDS_EXTRA_COMMANDS "<CMAKE_C_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -x c -M <SOURCE> -MT <OBJECT> -MD<DEP_FILE>")
+endif()
+
 __compiler_nvhpc(C)
diff --git a/Modules/Compiler/NVHPC-CXX.cmake b/Modules/Compiler/NVHPC-CXX.cmake
index 534e822..59ba7bf 100644
--- a/Modules/Compiler/NVHPC-CXX.cmake
+++ b/Modules/Compiler/NVHPC-CXX.cmake
@@ -9,4 +9,14 @@ if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 20.11)
   set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION -std=gnu++20)
 endif()
 
+if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 21.07)
+  set(CMAKE_DEPFILE_FLAGS_CXX "-MD -MT <DEP_TARGET> -MF <DEP_FILE>")
+  set(CMAKE_CXX_DEPFILE_FORMAT gcc)
+  set(CMAKE_CXX_DEPENDS_USE_COMPILER TRUE)
+else()
+  # Before NVHPC 21.07 the `-MD` flag implicitly
+  # implies `-E` and therefore compilation and dependency generation
+  # can't occur in the same invocation
+  set(CMAKE_CXX_DEPENDS_EXTRA_COMMANDS "<CMAKE_CXX_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -x c++ -M <SOURCE> -MT <OBJECT> -MD<DEP_FILE>")
+endif()
 __compiler_nvhpc(CXX)
diff --git a/Modules/Compiler/NVHPC.cmake b/Modules/Compiler/NVHPC.cmake
index a85df71..7048670 100644
--- a/Modules/Compiler/NVHPC.cmake
+++ b/Modules/Compiler/NVHPC.cmake
@@ -12,16 +12,4 @@ include(Compiler/PGI)
 
 macro(__compiler_nvhpc lang)
   # Logic specific to NVHPC.
-
-  if(CMAKE_${lang}_COMPILER_VERSION VERSION_GREATER_EQUAL 21.07)
-    set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <DEP_TARGET> -MF <DEP_FILE>")
-    set(CMAKE_${lang}_DEPFILE_FORMAT gcc)
-    set(CMAKE_${lang}_DEPENDS_USE_COMPILER TRUE)
-  else()
-    # Before NVHPC 21.07 the `-MD` flag implicitly
-    # implies `-E` and therefore compilation and dependency generation
-    # can't occur in the same invocation
-    set(CMAKE_${lang}_DEPENDS_EXTRA_COMMANDS "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> ${CMAKE_${lang}_COMPILE_OPTIONS_EXPLICIT_LANGUAGE} -M <SOURCE> -MT <OBJECT> -MD<DEP_FILE>")
-  endif()
-
 endmacro()