Create INTERPROCEDURAL_OPTIMIZATION build feature

This commit creates target and directory properties to enable the Intel
interprocedural optimization support on Linux.  Enabling it adds the
compiler option '-ipo' and uses 'xiar' to create archives.

See issue #9615.

Modules/Platform/Linux-Intel-C.cmake

@@ -1,6 +1,8 @@
 INCLUDE(Platform/Linux-Intel)
 IF(XIAR)
-  SET(CMAKE_C_CREATE_STATIC_LIBRARY
+  # INTERPROCEDURAL_OPTIMIZATION
+  SET(CMAKE_C_COMPILE_OPTIONS_IPO -ipo)
+  SET(CMAKE_C_CREATE_STATIC_LIBRARY_IPO
     "${XIAR} cr <TARGET> <LINK_FLAGS> <OBJECTS> "
     "${XIAR} -s <TARGET> ")
 ENDIF(XIAR)

Modules/Platform/Linux-Intel-CXX.cmake

@@ -1,6 +1,8 @@
 INCLUDE(Platform/Linux-Intel)
 IF(XIAR)
-  SET(CMAKE_CXX_CREATE_STATIC_LIBRARY
+  # INTERPROCEDURAL_OPTIMIZATION
+  SET(CMAKE_CXX_COMPILE_OPTIONS_IPO -ipo)
+  SET(CMAKE_CXX_CREATE_STATIC_LIBRARY_IPO
     "${XIAR} cr <TARGET> <LINK_FLAGS> <OBJECTS> "
     "${XIAR} -s <TARGET> ")
 ENDIF(XIAR)

Modules/Platform/Linux-Intel-Fortran.cmake

@@ -1,6 +1,8 @@
 INCLUDE(Platform/Linux-Intel)
 IF(XIAR)
-  SET(CMAKE_Fortran_CREATE_STATIC_LIBRARY
+  # INTERPROCEDURAL_OPTIMIZATION
+  SET(CMAKE_Fortran_COMPILE_OPTIONS_IPO -ipo)
+  SET(CMAKE_Fortran_CREATE_STATIC_LIBRARY_IPO
     "${XIAR} cr <TARGET> <LINK_FLAGS> <OBJECTS> "
     "${XIAR} -s <TARGET> ")
 ENDIF(XIAR)

Source/cmMakefile.cxx

@@ -3554,6 +3554,19 @@ void cmMakefile::DefineProperties(cmake *cm)
      "during dependency scanning to match include files that should "
      "be followed.  See the include_regular_expression command.", false);
 
+  cm->DefineProperty
+    ("INTERPROCEDURAL_OPTIMIZATION", cmProperty::DIRECTORY,
+     "Enable interprocedural optimization for targets in a directory.",
+     "If set to true, enables interprocedural optimizations "
+     "if they are known to be supported by the compiler.");
+
+  cm->DefineProperty
+    ("INTERPROCEDURAL_OPTIMIZATION_<CONFIG>", cmProperty::DIRECTORY,
+     "Per-configuration interprocedural optimization for a directory.",
+     "This is a per-configuration version of INTERPROCEDURAL_OPTIMIZATION.  "
+     "If set, this property overrides the generic property "
+     "for the named configuration.");
+
   cm->DefineProperty
     ("VARIABLES", cmProperty::DIRECTORY,
      "List of variables defined in the current directory.",

Source/cmMakefileLibraryTargetGenerator.cxx

@@ -113,6 +113,12 @@ void cmMakefileLibraryTargetGenerator::WriteStaticLibraryRules()
     }
   linkRuleVar += "_CREATE_STATIC_LIBRARY";
 
+  if(this->GetFeatureAsBool("INTERPROCEDURAL_OPTIMIZATION") &&
+     this->Makefile->GetDefinition((linkRuleVar+"_IPO").c_str()))
+    {
+    linkRuleVar += "_IPO";
+    }
+
   std::string extraFlags;
   this->LocalGenerator->AppendFlags
     (extraFlags,this->Target->GetProperty("STATIC_LIBRARY_FLAGS"));

Source/cmMakefileTargetGenerator.cxx

@@ -1780,4 +1780,9 @@ void cmMakefileTargetGenerator::AddFeatureFlags(
 {
   // Add language-specific flags.
   this->LocalGenerator->AddLanguageFlags(flags, lang, this->ConfigName);
+
+  if(this->GetFeatureAsBool("INTERPROCEDURAL_OPTIMIZATION"))
+    {
+    this->LocalGenerator->AppendFeatureOptions(flags, lang, "IPO");
+    }
 }

Source/cmTarget.cxx

@@ -420,6 +420,19 @@ void cmTarget::DefineProperties(cmake *cm)
      "CMAKE_INSTALL_RPATH_USE_LINK_PATH if it is set when a target is "
      "created.");
 
+  cm->DefineProperty
+    ("INTERPROCEDURAL_OPTIMIZATION", cmProperty::TARGET,
+     "Enable interprocedural optimization for a target.",
+     "If set to true, enables interprocedural optimizations "
+     "if they are known to be supported by the compiler.");
+
+  cm->DefineProperty
+    ("INTERPROCEDURAL_OPTIMIZATION_<CONFIG>", cmProperty::TARGET,
+     "Per-configuration interprocedural optimization for a target.",
+     "This is a per-configuration version of INTERPROCEDURAL_OPTIMIZATION.  "
+     "If set, this property overrides the generic property "
+     "for the named configuration.");
+
   cm->DefineProperty
     ("LABELS", cmProperty::TARGET,
      "Specify a list of text labels associated with a target.",