build: add mingw’s libgcc to the link command on Visual Studio.

build/msbuild/lol.rules.props

@@ -60,10 +60,11 @@
 
     <Link>
       <!-- FIXME: not for the static library! -->
-      <AdditionalDependencies Condition="'$(Platform)'=='Win32' Or '$(Platform)'=='x64'">kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;$(SdlDeps);$(FfmpegDeps);$(GdiDeps);$(XinputDeps);%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies Condition="'$(Platform)'=='Win32' Or '$(Platform)'=='x64'">kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;$(SdlDeps);$(FfmpegDeps);$(LibGccDeps);$(GdiDeps);$(XinputDeps);%(AdditionalDependencies)</AdditionalDependencies>
       <AdditionalDependencies Condition="'$(UseOpenGL)'=='true' And ('$(Platform)'=='Win32' Or '$(Platform)'=='x64')">$(GlDeps);%(AdditionalDependencies)</AdditionalDependencies>
       <AdditionalDependencies Condition="'$(UseOpenGL)'=='false' And ('$(Platform)'=='Win32' Or '$(Platform)'=='x64')">$(D3d9Deps);%(AdditionalDependencies)</AdditionalDependencies>
       <AdditionalDependencies>%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalLibraryDirectories Condition="'$(Platform)'=='Win32' Or '$(Platform)'=='x64'">$(LibGccLibs);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
       <AdditionalLibraryDirectories Condition="'$(Platform)'=='Win32' Or '$(Platform)'=='x64'">$(SdlLibs);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
       <AdditionalLibraryDirectories Condition="'$(Platform)'=='Win32' Or '$(Platform)'=='x64'">$(FfmpegLibs);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
       <AdditionalLibraryDirectories Condition="'$(Platform)'=='Win32' Or '$(Platform)'=='x64'">$(GlLibs);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>

build/msbuild/lol.vars.props

@@ -8,6 +8,12 @@
     <FlexDir>$(ExternalDir)\flex-2.5.35</FlexDir>
     <FlexIncludes>$(FlexDir)\include</FlexIncludes>
 
+    <!-- libgcc (from mingw-w64) -->
+    <LibGccDir>$(ExternalDir)\libgcc-4.9</LibGccDir>
+    <LibGccLibs Condition="'$(Platform)'=='Win32'">$(LibGccDir)\lib\i686-w64-mingw32</LibGccLibs>
+    <LibGccLibs Condition="'$(Platform)'=='x64'">$(LibGccDir)\lib\x86_64-w64-mingw32</LibGccLibs>
+    <LibGccDeps>libgcc.lib</LibGccDeps>
+
     <!-- SDL -->
     <SdlDir>$(ExternalDir)\sdl-2.0.3</SdlDir>
     <SdlImageDir>$(ExternalDir)\sdl-image-2.0.0</SdlImageDir>
@@ -101,6 +107,9 @@
     <BuildMacro Include="ExternalDir"><Value>$(ExternalDir)</Value></BuildMacro>
     <BuildMacro Include="FlexDir"><Value>$(FlexDir)</Value></BuildMacro>
     <BuildMacro Include="FlexIncludes"><Value>$(FlexIncludes)</Value></BuildMacro>
+    <BuildMacro Include="LibGccDir"><Value>$(LibGccDir)</Value></BuildMacro>
+    <BuildMacro Include="LibGccLibs"><Value>$(LibGccLibs)</Value></BuildMacro>
+    <BuildMacro Include="LibGccDeps"><Value>$(LibGccDeps)</Value></BuildMacro>
     <BuildMacro Include="SdlDir"><Value>$(SdlDir)</Value></BuildMacro>
     <BuildMacro Include="SdlImageDir"><Value>$(SdlImageDir)</Value></BuildMacro>
     <BuildMacro Include="SdlMixerDir"><Value>$(SdlMixerDir)</Value></BuildMacro>