qmake/vcxproj: resurrect support for /we compiler switch

The vcxproj format supports the /we compiler switch as
TreatSpecificWarningsAsErrors tag.
Support for this switch got lost during refactoring of the
vc(x)proj generators for Qt 4.8.0.

Task-number: QTBUG-29098

Change-Id: I607e907dcb9c1bc7d261053b6d757941ec7db822
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
(cherry picked from commit a3d1d41d1d88b989fe7c460ef32b4f8606aafe0c)

3 files changed, 8 insertions, 1 deletions

diff --git a/qmake/generators/win32/msbuild_objectmodel.cpp b/qmake/generators/win32/msbuild_objectmodel.cpp
index e0b9917..eba49f9 100644
--- a/qmake/generators/win32/msbuild_objectmodel.cpp
+++ b/qmake/generators/win32/msbuild_objectmodel.cpp
@@ -1329,7 +1329,7 @@ void VCXProjectWriter::write(XmlOutput &xml, const VCCLCompilerTool &tool)
             << attrTagT(_StringPooling, tool.StringPooling)
             << attrTagS(_StructMemberAlignment, toString(tool.StructMemberAlignment))
             << attrTagT(_SuppressStartupBanner, tool.SuppressStartupBanner)
-//unused    << attrTagS(_TreatSpecificWarningsAsErrors, tool.TreatSpecificWarningsAsErrors)
+            << attrTagX(_TreatSpecificWarningsAsErrors, tool.TreatSpecificWarningsAsErrors, ";")
             << attrTagT(_TreatWarningAsError, tool.WarnAsError)
             << attrTagT(_TreatWChar_tAsBuiltInType, tool.TreatWChar_tAsBuiltInType)
             << attrTagT(_UndefineAllPreprocessorDefinitions, tool.UndefineAllPreprocessorDefinitions)
diff --git a/qmake/generators/win32/msvc_objectmodel.cpp b/qmake/generators/win32/msvc_objectmodel.cpp
index a8c936b..2472354 100644
--- a/qmake/generators/win32/msvc_objectmodel.cpp
+++ b/qmake/generators/win32/msvc_objectmodel.cpp
@@ -1113,6 +1113,12 @@ bool VCCLCompilerTool::parseOption(const char* option)
         case 'd':
             DisableSpecificWarnings += option+3;
             break;
+        case 'e':
+            if (config->CompilerVersion <= NET2008)
+                AdditionalOptions += option;
+            else
+                TreatSpecificWarningsAsErrors += option + 3;
+            break;
         default:
             AdditionalOptions += option;
         }
diff --git a/qmake/generators/win32/msvc_objectmodel.h b/qmake/generators/win32/msvc_objectmodel.h
index a5a0ba5..a941b67 100644
--- a/qmake/generators/win32/msvc_objectmodel.h
+++ b/qmake/generators/win32/msvc_objectmodel.h
@@ -558,6 +558,7 @@ public:
     QStringList             UndefinePreprocessorDefinitions;
     pchOption               UsePrecompiledHeader;
     triState                UseUnicodeForAssemblerListing;
+    QStringList             TreatSpecificWarningsAsErrors;
     triState                WarnAsError;
     warningLevelOption      WarningLevel;
     triState                WholeProgramOptimization;