Merge branch 'ninja-restat-custom-command-byproducts' into release

Source/cmLocalNinjaGenerator.cxx

@@ -400,7 +400,7 @@ cmLocalNinjaGenerator::WriteCustomCommandBuildStatement(
 
   bool symbolic = false;
   for (std::vector<std::string>::const_iterator o = outputs.begin();
-       o != outputs.end(); ++o)
+       !symbolic && o != outputs.end(); ++o)
     {
     if (cmSourceFile* sf = this->Makefile->GetSource(*o))
       {
@@ -444,7 +444,7 @@ cmLocalNinjaGenerator::WriteCustomCommandBuildStatement(
       this->ConstructComment(ccg),
       "Custom command for " + ninjaOutputs[0],
       cc->GetUsesTerminal(),
-      /*restat*/!symbolic,
+      /*restat*/!symbolic || !byproducts.empty(),
       ninjaOutputs,
       ninjaDeps,
       orderOnlyDeps);

Tests/RunCMake/BuildDepends/Custom-Symbolic-and-Byproduct.cmake

@@ -0,0 +1,28 @@
+add_custom_command(
+  OUTPUT gen-byproduct gen-byproduct-stamp
+  BYPRODUCTS byproduct
+  COMMAND ${CMAKE_COMMAND} -E touch gen-byproduct-stamp
+  COMMAND ${CMAKE_COMMAND} -E copy_if_different gen-byproduct-stamp byproduct
+  )
+set_property(SOURCE gen-byproduct PROPERTY SYMBOLIC 1)
+add_custom_target(produce DEPENDS gen-byproduct)
+
+add_custom_command(
+  OUTPUT use-byproduct
+  DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/byproduct
+  COMMAND ${CMAKE_COMMAND} -E touch use-byproduct
+  )
+add_custom_target(drive ALL DEPENDS use-byproduct)
+add_dependencies(drive produce)
+
+file(GENERATE OUTPUT check-$<LOWER_CASE:$<CONFIG>>.cmake CONTENT "
+if (check_step EQUAL 1)
+  set(check_pairs
+    \"${CMAKE_CURRENT_BINARY_DIR}/use-byproduct|${CMAKE_CURRENT_BINARY_DIR}/gen-byproduct-stamp\"
+    )
+else()
+  set(check_pairs
+    \"${CMAKE_CURRENT_BINARY_DIR}/gen-byproduct-stamp|${CMAKE_CURRENT_BINARY_DIR}/use-byproduct\"
+    )
+endif()
+")

Tests/RunCMake/BuildDepends/RunCMakeTest.cmake

@@ -39,4 +39,5 @@ if(NOT RunCMake_GENERATOR MATCHES "Visual Studio [67]|Xcode")
   unset(run_BuildDepends_skip_step_2)
 endif()
 
+run_BuildDepends(Custom-Symbolic-and-Byproduct)
 run_BuildDepends(Custom-Always)