FindPython: fix reason failure propagation

Modules/FindPython/Support.cmake

@@ -481,7 +481,7 @@ function (_PYTHON_VALIDATE_INTERPRETER)
 
   if (_PVI_CHECK_EXISTS AND NOT EXISTS "${_${_PYTHON_PREFIX}_EXECUTABLE}")
     # interpreter does not exist anymore
-    set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot find the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+    set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot find the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
     return()
   endif()
@@ -500,7 +500,7 @@ function (_PYTHON_VALIDATE_INTERPRETER)
     endif()
     if (NOT abi IN_LIST _${_PYTHON_PREFIX}_ABIFLAGS)
       # incompatible ABI
-      set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong ABI for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+      set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong ABI for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
       set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
       return()
     endif()
@@ -518,12 +518,12 @@ function (_PYTHON_VALIDATE_INTERPRETER)
                      OUTPUT_STRIP_TRAILING_WHITESPACE)
     if (result)
       # interpreter is not usable
-      set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot use the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+      set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot use the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
       set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
     else()
       if (_PVI_EXACT AND NOT version VERSION_EQUAL expected_version)
         # interpreter has wrong version
-        set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong version for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+        set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong version for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
         set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
       else()
         # check that version is OK
@@ -531,7 +531,7 @@ function (_PYTHON_VALIDATE_INTERPRETER)
         string(REGEX REPLACE "^([0-9]+)\\.?.*$" "\\1" expected_major_version "${expected_version}")
         if (NOT major_version VERSION_EQUAL expected_major_version
             OR NOT version VERSION_GREATER_EQUAL expected_version)
-          set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong version for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+          set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong version for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
           set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
         endif()
       endif()
@@ -552,9 +552,9 @@ function (_PYTHON_VALIDATE_INTERPRETER)
       if (result OR NOT version EQUAL _${_PYTHON_PREFIX}_REQUIRED_VERSION_MAJOR)
         # interpreter not usable or has wrong major version
         if (result)
-          set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot use the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+          set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot use the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
         else()
-          set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong major version for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+          set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong major version for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
         endif()
         set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
         return()
@@ -574,9 +574,9 @@ function (_PYTHON_VALIDATE_INTERPRETER)
     if (result OR NOT size EQUAL CMAKE_SIZEOF_VOID_P)
       # interpreter not usable or has wrong architecture
       if (result)
-        set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot use the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+        set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Cannot use the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
       else()
-        set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong architecture for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"")
+        set (_${_PYTHON_PREFIX}_Interpreter_REASON_FAILURE "Wrong architecture for the interpreter \"${_${_PYTHON_PREFIX}_EXECUTABLE}\"" PARENT_SCOPE)
       endif()
       set_property (CACHE _${_PYTHON_PREFIX}_EXECUTABLE PROPERTY VALUE "${_PYTHON_PREFIX}_EXECUTABLE-NOTFOUND")
       return()
@@ -602,7 +602,7 @@ function (_PYTHON_VALIDATE_COMPILER)
 
   if (_PVC_CHECK_EXISTS AND NOT EXISTS "${_${_PYTHON_PREFIX}_COMPILER}")
     # Compiler does not exist anymore
-    set (_${_PYTHON_PREFIX}_Compiler_REASON_FAILURE "Cannot find the compiler \"${_${_PYTHON_PREFIX}_COMPILER}\"")
+    set (_${_PYTHON_PREFIX}_Compiler_REASON_FAILURE "Cannot find the compiler \"${_${_PYTHON_PREFIX}_COMPILER}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_COMPILER PROPERTY VALUE "${_PYTHON_PREFIX}_COMPILER-NOTFOUND")
     return()
   endif()
@@ -628,12 +628,12 @@ function (_PYTHON_VALIDATE_COMPILER)
   file (REMOVE_RECURSE "${working_dir}")
   if (result)
     # compiler is not usable
-    set (_${_PYTHON_PREFIX}_Compiler_REASON_FAILURE "Cannot use the compiler \"${_${_PYTHON_PREFIX}_COMPILER}\"")
+    set (_${_PYTHON_PREFIX}_Compiler_REASON_FAILURE "Cannot use the compiler \"${_${_PYTHON_PREFIX}_COMPILER}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_COMPILER PROPERTY VALUE "${_PYTHON_PREFIX}_COMPILER-NOTFOUND")
   elseif ((_PVC_EXACT AND NOT version VERSION_EQUAL expected_version)
           OR NOT version VERSION_GREATER_EQUAL expected_version)
     # Compiler has wrong version
-    set (_${_PYTHON_PREFIX}_Compiler_REASON_FAILURE "Wrong version for the compiler \"${_${_PYTHON_PREFIX}_COMPILER}\"")
+    set (_${_PYTHON_PREFIX}_Compiler_REASON_FAILURE "Wrong version for the compiler \"${_${_PYTHON_PREFIX}_COMPILER}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_COMPILER PROPERTY VALUE "${_PYTHON_PREFIX}_COMPILER-NOTFOUND")
   endif()
 endfunction()
@@ -653,7 +653,7 @@ function (_PYTHON_VALIDATE_LIBRARY)
 
   if (_PVL_CHECK_EXISTS AND NOT EXISTS "${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}")
     # library does not exist anymore
-    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Cannot find the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"")
+    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Cannot find the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_LIBRARY_RELEASE PROPERTY VALUE "${_PYTHON_PREFIX}_LIBRARY_RELEASE-NOTFOUND")
     if (WIN32)
       set_property (CACHE _${_PYTHON_PREFIX}_LIBRARY_DEBUG PROPERTY VALUE "${_PYTHON_PREFIX}_LIBRARY_DEBUG-NOTFOUND")
@@ -667,19 +667,19 @@ function (_PYTHON_VALIDATE_LIBRARY)
 
   if (DEFINED _${_PYTHON_PREFIX}_FIND_ABI AND NOT lib_ABI IN_LIST _${_PYTHON_PREFIX}_ABIFLAGS)
     # incompatible ABI
-    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong ABI for the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"")
+    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong ABI for the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_LIBRARY_RELEASE PROPERTY VALUE "${_PYTHON_PREFIX}_LIBRARY_RELEASE-NOTFOUND")
   else()
     if (expected_version)
       if ((_PVL_EXACT AND NOT lib_VERSION VERSION_EQUAL expected_version) OR (lib_VERSION VERSION_LESS expected_version))
         # library has wrong version
-        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong version for the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"")
+        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong version for the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"" PARENT_SCOPE)
         set_property (CACHE _${_PYTHON_PREFIX}_LIBRARY_RELEASE PROPERTY VALUE "${_PYTHON_PREFIX}_LIBRARY_RELEASE-NOTFOUND")
       endif()
     else()
       if (NOT lib_VERSION_MAJOR VERSION_EQUAL _${_PYTHON_PREFIX}_REQUIRED_VERSION_MAJOR)
         # library has wrong major version
-        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong major version for the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"")
+        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong major version for the library \"${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}\"" PARENT_SCOPE)
         set_property (CACHE _${_PYTHON_PREFIX}_LIBRARY_RELEASE PROPERTY VALUE "${_PYTHON_PREFIX}_LIBRARY_RELEASE-NOTFOUND")
       endif()
     endif()
@@ -710,7 +710,7 @@ function (_PYTHON_VALIDATE_INCLUDE_DIR)
 
   if (_PVID_CHECK_EXISTS AND NOT EXISTS "${_${_PYTHON_PREFIX}_INCLUDE_DIR}")
     # include file does not exist anymore
-    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Cannot find the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"")
+    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Cannot find the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_INCLUDE_DIR PROPERTY VALUE "${_PYTHON_PREFIX}_INCLUDE_DIR-NOTFOUND")
     return()
   endif()
@@ -720,19 +720,19 @@ function (_PYTHON_VALIDATE_INCLUDE_DIR)
 
   if (DEFINED _${_PYTHON_PREFIX}_FIND_ABI AND NOT inc_ABI IN_LIST _${_PYTHON_PREFIX}_ABIFLAGS)
     # incompatible ABI
-    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong ABI for the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"")
+    set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong ABI for the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"" PARENT_SCOPE)
     set_property (CACHE _${_PYTHON_PREFIX}_INCLUDE_DIR PROPERTY VALUE "${_PYTHON_PREFIX}_INCLUDE_DIR-NOTFOUND")
   else()
     if (expected_version)
       if ((_PVID_EXACT AND NOT inc_VERSION VERSION_EQUAL expected_version) OR (inc_VERSION VERSION_LESS expected_version))
         # include dir has wrong version
-        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong version for the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"")
+        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong version for the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"" PARENT_SCOPE)
         set_property (CACHE _${_PYTHON_PREFIX}_INCLUDE_DIR PROPERTY VALUE "${_PYTHON_PREFIX}_INCLUDE_DIR-NOTFOUND")
       endif()
     else()
       if (NOT inc_VERSION_MAJOR VERSION_EQUAL _${_PYTHON_PREFIX}_REQUIRED_VERSION_MAJOR)
         # include dir has wrong major version
-        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong major version for the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"")
+        set (_${_PYTHON_PREFIX}_Development_REASON_FAILURE "Wrong major version for the directory \"${_${_PYTHON_PREFIX}_INCLUDE_DIR}\"" PARENT_SCOPE)
         set_property (CACHE _${_PYTHON_PREFIX}_INCLUDE_DIR PROPERTY VALUE "${_PYTHON_PREFIX}_INCLUDE_DIR-NOTFOUND")
       endif()
     endif()
@@ -2390,9 +2390,11 @@ endif()
 
 unset (_${_PYTHON_PREFIX}_REASON_FAILURE)
 foreach (_${_PYTHON_PREFIX}_COMPONENT IN ITEMS Interpreter Compiler Development NumPy)
-  if (_${_PYTHON_PREFIX}_${_${_PYTHON_PREFIX}_COMPONENT}_REASON_FAILURE)
+  if (NOT ${_PYTHON_PREFIX}_${_${_PYTHON_PREFIX}_COMPONENT}_FOUND
+      AND _${_PYTHON_PREFIX}_${_${_PYTHON_PREFIX}_COMPONENT}_REASON_FAILURE)
     string (APPEND _${_PYTHON_PREFIX}_REASON_FAILURE "\n        ${_${_PYTHON_PREFIX}_COMPONENT}: ${_${_PYTHON_PREFIX}_${_${_PYTHON_PREFIX}_COMPONENT}_REASON_FAILURE}")
   endif()
+  unset (_${_PYTHON_PREFIX}_${_${_PYTHON_PREFIX}_COMPONENT}_REASON_FAILURE)
 endforeach()
 
 include (${CMAKE_CURRENT_LIST_DIR}/../FindPackageHandleStandardArgs.cmake)