gen_msvs_vcxproj.sh: add --enable-werror option

translates to TreatWarningAsError (/WX)
setting this via the CL environment variable is not possible due to the
/WX- default which is used on the command line

Change-Id: I0b42a9d3ca9eba6af82c25b8e434baa2fcb00156

build/make/gen_msvs_vcxproj.sh

@@ -28,6 +28,7 @@ Options:
     --lib                       Generate a project for creating a static library
     --dll                       Generate a project for creating a dll
     --static-crt                Use the static C runtime (/MT)
+    --enable-werror             Treat warnings as errors (/WX)
     --target=isa-os-cc          Target specifier (required)
     --out=filename              Write output to a file [stdout]
     --name=project_name         Name of the project (required)
@@ -233,6 +234,8 @@ for opt in "$@"; do
         ;;
         --static-crt) use_static_runtime=true
         ;;
+        --enable-werror) werror=true
+        ;;
         --ver=*)
             vs_ver="$optval"
             case "$optval" in
@@ -492,7 +495,9 @@ generate_vcxproj() {
             tag_content PreprocessorDefinitions "WIN32;$debug;_CRT_SECURE_NO_WARNINGS;_CRT_SECURE_NO_DEPRECATE$extradefines;%(PreprocessorDefinitions)"
             tag_content RuntimeLibrary $runtime
             tag_content WarningLevel Level3
-            # DebugInformationFormat
+            if ${werror:-false}; then
+                tag_content TreatWarningAsError true
+            fi
             close_tag ClCompile
             case "$proj_kind" in
             exe)

configure

@@ -689,6 +689,7 @@ process_toolchain() {
              10|11|12)
                  VCPROJ_SFX=vcxproj
                  gen_vcproj_cmd=${source_path}/build/make/gen_msvs_vcxproj.sh
+                 enabled werror && gen_vcproj_cmd="${gen_vcproj_cmd} --enable-werror"
                  ;;
              esac
              all_targets="${all_targets} solution"