MSVC: Prevent incremental linking on debug builds

Makes startup times with cdb (a bit) less painful.

Change-Id: Ib6f4d11a2e6cfc561cc2c5c5598d0751a76208cb
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

qtcreator.pri

@@ -183,6 +183,8 @@ unix {
 win32-msvc* { 
     #Don't warn about sprintf, fopen etc being 'unsafe'
     DEFINES += _CRT_SECURE_NO_WARNINGS
+    # Speed up startup time when debugging with cdb
+    QMAKE_LFLAGS_DEBUG += /INCREMENTAL:NO
 }
 
 qt:greaterThan(QT_MAJOR_VERSION, 4) {

src/libs/QtcLibrary.qbs

@@ -15,6 +15,8 @@ DynamicLibrary {
     cpp.linkerFlags: {
         if (qbs.buildVariant == "release" && (qbs.toolchain.contains("gcc") || qbs.toolchain.contains("mingw")))
             return ["-Wl,-s"]
+        else if (qbs.buildVariant == "debug" && qbs.toolchain.contains("msvc"))
+            return ["/INCREMENTAL:NO"] // Speed up startup time when debugging with cdb
     }
     cpp.installNamePrefix: "@rpath/PlugIns/"
     cpp.rpaths: qbs.targetOS.contains("osx")

src/plugins/QtcPlugin.qbs

@@ -30,6 +30,8 @@ Product {
     cpp.linkerFlags: {
         if (qbs.buildVariant == "release" && (qbs.toolchain.contains("gcc") || qbs.toolchain.contains("mingw")))
             return ["-Wl,-s"]
+        else if (qbs.buildVariant == "debug" && qbs.toolchain.contains("msvc"))
+            return ["/INCREMENTAL:NO"] // Speed up startup time when debugging with cdb
     }
     cpp.includePaths: [path]