cgraph: MSBuild: define GVDLL to ensure correct storage-class attributes

An upcoming commit will change the storage-class attributes to be
controlled by the GVDLL symbol in cdt.h.

Without this change, errors like this would occur:

refstr.obj : error LNK2001: unresolved external symbol _Dttree [C:\GitLab-Runner\builds\magjac\graphviz\lib\cgraph\cgraph.vcxproj]

Towards https://gitlab.com/graphviz/graphviz/-/issues/2173.

diff --git a/lib/cgraph/cgraph.vcxproj b/lib/cgraph/cgraph.vcxproj
index 19daa1257ec9549ce5a714b598f079a7adb0f38b..052a3bba77d554021c945075fa10031ab97ca4ef 100644 (file)
--- a/lib/cgraph/cgraph.vcxproj
+++ b/lib/cgraph/cgraph.vcxproj
@@ -52,7 +52,7 @@
     <ClCompile>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>$(ProjectDir);$(SolutionDir)windows\include;$(SolutionDir)lib;$(SolutionDir)lib\cdt</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>EXPORT_CGRAPH;EXPORT_AGXBUF;EXPORT_CGHDR;YY_NO_UNISTD_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>GVDLL;EXPORT_CGRAPH;EXPORT_AGXBUF;EXPORT_CGHDR;YY_NO_UNISTD_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <PrecompiledHeader />
@@ -76,7 +76,7 @@ win_flex -oscan.c scan.l</Command>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <AdditionalIncludeDirectories>$(ProjectDir);$(SolutionDir)windows\include;$(SolutionDir)lib;$(SolutionDir)lib\cdt</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>EXPORT_CGRAPH;EXPORT_AGXBUF;EXPORT_CGHDR;YY_NO_UNISTD_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>GVDLL;EXPORT_CGRAPH;EXPORT_AGXBUF;EXPORT_CGHDR;YY_NO_UNISTD_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PrecompiledHeader />
       <WarningLevel>Level4</WarningLevel>
       <EnablePREfast>true</EnablePREfast>