Add option to enable -MP compile option for MSVC

The option is on when building Qt, but off by default for other
projects, due to potential incompatible compile options in other
projects. (/E, /EP, /Gm, /Yc, /showIncludes, #import preprocessor
directive)

Reviewed-by: bhughes
Reviewed-by: ossi

4 files changed, 19 insertions, 1 deletions

diff --git a/mkspecs/features/win32/msvc_mp.prf b/mkspecs/features/win32/msvc_mp.prf
new file mode 100644
index 0000000..d6dea14
--- /dev/null
+++ b/mkspecs/features/win32/msvc_mp.prf
@@ -0,0 +1,2 @@
+QMAKE_CFLAGS += $$QMAKE_CFLAGS_MP
+QMAKE_CXXFLAGS += $$QMAKE_CXXFLAGS_MP
diff --git a/mkspecs/win32-msvc2008/qmake.conf b/mkspecs/win32-msvc2008/qmake.conf
index 9805e90..9a69aaa 100644
--- a/mkspecs/win32-msvc2008/qmake.conf
+++ b/mkspecs/win32-msvc2008/qmake.conf
@@ -23,6 +23,7 @@ QMAKE_CFLAGS_RELEASE    = -O2 -MD
 QMAKE_CFLAGS_DEBUG      = -Zi -MDd
 QMAKE_CFLAGS_YACC       =
 QMAKE_CFLAGS_LTCG       = -GL
+QMAKE_CFLAGS_MP         = -MP
 
 QMAKE_CXX               = $$QMAKE_CC
 QMAKE_CXXFLAGS          = $$QMAKE_CFLAGS
@@ -32,6 +33,7 @@ QMAKE_CXXFLAGS_RELEASE  = $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG    = $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_YACC     = $$QMAKE_CFLAGS_YACC
 QMAKE_CXXFLAGS_LTCG     = $$QMAKE_CFLAGS_LTCG
+QMAKE_CXXFLAGS_MP       = $$QMAKE_CFLAGS_MP
 QMAKE_CXXFLAGS_STL_ON   = -EHsc
 QMAKE_CXXFLAGS_STL_OFF  =
 QMAKE_CXXFLAGS_RTTI_ON  = -GR
diff --git a/mkspecs/win32-msvc2010/qmake.conf b/mkspecs/win32-msvc2010/qmake.conf
index 28d4d3c..8331c14 100644
--- a/mkspecs/win32-msvc2010/qmake.conf
+++ b/mkspecs/win32-msvc2010/qmake.conf
@@ -23,6 +23,7 @@ QMAKE_CFLAGS_RELEASE    = -O2 -MD
 QMAKE_CFLAGS_DEBUG      = -Zi -MDd
 QMAKE_CFLAGS_YACC       =
 QMAKE_CFLAGS_LTCG       = -GL
+QMAKE_CFLAGS_MP         = -MP
 
 QMAKE_CXX               = $$QMAKE_CC
 QMAKE_CXXFLAGS          = $$QMAKE_CFLAGS
@@ -32,6 +33,7 @@ QMAKE_CXXFLAGS_RELEASE  = $$QMAKE_CFLAGS_RELEASE
 QMAKE_CXXFLAGS_DEBUG    = $$QMAKE_CFLAGS_DEBUG
 QMAKE_CXXFLAGS_YACC     = $$QMAKE_CFLAGS_YACC
 QMAKE_CXXFLAGS_LTCG     = $$QMAKE_CFLAGS_LTCG
+QMAKE_CXXFLAGS_MP       = $$QMAKE_CFLAGS_MP
 QMAKE_CXXFLAGS_STL_ON   = -EHsc
 QMAKE_CXXFLAGS_STL_OFF  =
 QMAKE_CXXFLAGS_RTTI_ON  = -GR
diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index 09da581..89d3ef0 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -381,6 +381,7 @@ Configure::Configure(int& argc, char** argv)
     dictionary[ "INCREDIBUILD_XGE" ] = "auto";
     dictionary[ "LTCG" ]            = "no";
     dictionary[ "NATIVE_GESTURES" ] = "yes";
+    dictionary[ "MSVC_MP" ] = "no";
 }
 
 Configure::~Configure()
@@ -534,6 +535,13 @@ void Configure::parseCmdLine()
         else if (configCmdLine.at(i) == "-no-ltcg") {
             dictionary[ "LTCG" ] = "no";
         }
+        else if (configCmdLine.at(i) == "-mp") {
+            dictionary[ "MSVC_MP" ] = "yes";
+        }
+        else if (configCmdLine.at(i) == "-no-mp") {
+            dictionary[ "MSVC_MP" ] = "no";
+        }
+
 #endif
 
         else if (configCmdLine.at(i) == "-platform") {
@@ -1848,6 +1856,8 @@ bool Configure::displayHelp()
         desc("STYLE_S60" , "yes", "",                   "  s60\n", ' ');
         desc("NATIVE_GESTURES", "no", "-no-native-gestures", "Do not use native gestures on Windows 7.");
         desc("NATIVE_GESTURES", "yes", "-native-gestures", "Use native gestures on Windows 7.");
+        desc("MSVC_MP", "no", "-no-mp",                 "Do not use multiple processors for compiling with MSVC");
+        desc("MSVC_MP", "yes", "-mp",                   "Use multiple processors for compiling with MSVC (-MP)");
 
 /*      We do not support -qconfig on Windows yet
 
@@ -2822,7 +2832,7 @@ void Configure::generateCachefile()
         for (QStringList::Iterator var = qmakeVars.begin(); var != qmakeVars.end(); ++var) {
             cacheStream << (*var) << endl;
         }
-        cacheStream << "CONFIG         += " << qmakeConfig.join(" ") << " incremental create_prl link_prl depend_includepath QTDIR_build" << endl;
+        cacheStream << "CONFIG         += " << qmakeConfig.join(" ") << " incremental msvc_mp create_prl link_prl depend_includepath QTDIR_build" << endl;
 
         QStringList buildParts;
         buildParts << "libs" << "tools" << "examples" << "demos" << "docs" << "translations";
@@ -2885,6 +2895,8 @@ void Configure::generateCachefile()
 
         if (dictionary[ "LTCG" ] == "yes")
             configStream << " ltcg";
+        if (dictionary[ "MSVC_MP" ] == "yes")
+            configStream << " msvc_mp";
         if (dictionary[ "STL" ] == "yes")
             configStream << " stl";
         if (dictionary[ "EXCEPTIONS" ] == "yes")