Merge branch 'ninja-object-library' into object-library

* ninja-object-library: (37 commits)
  Ninja: Honor $<TARGET_OBJECTS:...> source expressions
  Build object library targets in Ninja
  Pre-compute object file names before Ninja generation
  Simplify cmNinjaTargetGenerator using cmGeneratorTarget
  Ninja: Avoid using 'this' in member initializers
  Ninja: Fix for PDB files with spaces in the path.
  Ninja: Constify use of cmCustomCommand
  Ninja: add /DEF: flag to linker call
  Ninja: Add a cache option CMAKE_ENABLE_NINJA to enable the ninja generator.
  Ninja: Add friend struct so it can access the private ConvertToNinjaPath.
  Ninja: add .def file support
  Ninja: ensure the output dir exists at compile time
  Ninja: Remove an unnecessary variable
  Ninja: Use cmSystemTools::ExpandListArgument to split compile/link commands
  Ninja: Add a missed license header
  Ninja: CMake: Adapt Ninja generator for per-target include dirs
  Ninja: windows msvc: create for each target a .pdb file
  Ninja: Import library support for Windows
  Ninja: mark the Windows specific hacks with a comment only
  Ninja: disable unfinished Windows ninja support
  ...

4 files changed, 45 insertions, 4 deletions

diff --git a/Modules/CMakeNinjaFindMake.cmake b/Modules/CMakeNinjaFindMake.cmake
new file mode 100644
index 0000000..f15c3e0
--- /dev/null
+++ b/Modules/CMakeNinjaFindMake.cmake
@@ -0,0 +1,17 @@
+
+#=============================================================================
+# Copyright 2011 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+FIND_PROGRAM(CMAKE_MAKE_PROGRAM ninja
+  DOC "Program used to build from build.ninja files.")
+MARK_AS_ADVANCED(CMAKE_MAKE_PROGRAM)
diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index 8d6f5df..bdcaf9d 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -24,6 +24,15 @@ macro(__compiler_gnu lang)
   set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
   set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
 
+  # Older versions of gcc (< 4.5) contain a bug causing them to report a missing
+  # header file as a warning if depfiles are enabled, causing check_header_file
+  # tests to always succeed.  Work around this by disabling dependency tracking
+  # in try_compile mode.
+  GET_PROPERTY(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
+  if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
+    set(CMAKE_DEPFILE_FLAGS_${lang} "-MMD -MF <DEPFILE>")
+  endif()
+
   # Initial configuration flags.
   set(CMAKE_${lang}_FLAGS_INIT "")
   set(CMAKE_${lang}_FLAGS_DEBUG_INIT "-g")
diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake
index fb55d3b..b6fe190 100644
--- a/Modules/ExternalProject.cmake
+++ b/Modules/ExternalProject.cmake
@@ -833,6 +833,12 @@ function(ExternalProject_Add_StepTargets name)
   foreach(step ${steps})
     add_custom_target(${name}-${step}
       DEPENDS ${stamp_dir}${cfgdir}/${name}-${step})
+
+    # Depend on other external projects (target-level).
+    get_property(deps TARGET ${name} PROPERTY _EP_DEPENDS)
+    foreach(arg IN LISTS deps)
+      add_dependencies(${name}-${step} ${arg})
+    endforeach()
   endforeach()
 endfunction(ExternalProject_Add_StepTargets)
 
@@ -1451,9 +1457,18 @@ function(ExternalProject_Add name)
   # depends on the 'done' mark so that it rebuilds when this project
   # rebuilds.  It is important that 'done' is not the output of any
   # custom command so that CMake does not propagate build rules to
-  # other external project targets.
+  # other external project targets, which may cause problems during
+  # parallel builds.  However, the Ninja generator needs to see the entire
+  # dependency graph, and can cope with custom commands belonging to
+  # multiple targets, so we add the 'done' mark as an output for Ninja only.
+  set(complete_outputs ${cmf_dir}${cfgdir}/${name}-complete)
+  if(${CMAKE_GENERATOR} MATCHES "Ninja")
+    set(complete_outputs
+        ${complete_outputs} ${stamp_dir}${cfgdir}/${name}-done)
+  endif()
+
   add_custom_command(
-    OUTPUT ${cmf_dir}${cfgdir}/${name}-complete
+    OUTPUT ${complete_outputs}
     COMMENT "Completed '${name}'"
     COMMAND ${CMAKE_COMMAND} -E make_directory ${cmf_dir}${cfgdir}
     COMMAND ${CMAKE_COMMAND} -E touch ${cmf_dir}${cfgdir}/${name}-complete
diff --git a/Modules/Platform/Windows-cl.cmake b/Modules/Platform/Windows-cl.cmake
index ccccbc9..be6abb6 100644
--- a/Modules/Platform/Windows-cl.cmake
+++ b/Modules/Platform/Windows-cl.cmake
@@ -37,7 +37,7 @@ SET(CMAKE_COMPILE_RESOURCE "rc <FLAGS> /fo<OBJECT> <SOURCE>")
 # that is automatically copied into try_compile directories
 # by the global generator.
 SET(MSVC_IDE 1)
-IF(CMAKE_GENERATOR MATCHES "Makefiles")
+IF(CMAKE_GENERATOR MATCHES "Makefiles" OR CMAKE_GENERATOR MATCHES "Ninja")
   SET(MSVC_IDE 0)
   IF(NOT CMAKE_VC_COMPILER_TESTS_RUN)
     SET(CMAKE_VC_COMPILER_TESTS 1)
@@ -125,7 +125,7 @@ IF(CMAKE_GENERATOR MATCHES "Makefiles")
     ENDIF(CMAKE_COMPILER_RETURN)
     MAKE_DIRECTORY("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp3")
   ENDIF(NOT CMAKE_VC_COMPILER_TESTS_RUN)
-ENDIF(CMAKE_GENERATOR MATCHES "Makefiles")
+ENDIF(CMAKE_GENERATOR MATCHES "Makefiles" OR CMAKE_GENERATOR MATCHES "Ninja")
 
 IF(MSVC_C_ARCHITECTURE_ID MATCHES 64)
   SET(CMAKE_CL_64 1)