问题
Can anybody explain me that very strange fenomenon ?
In my VS2005 Managed C++ project file (VCPROJ) is defined:
<Configuration
Name="Debug|Win32"
....
PreprocessorDefinitions="WIN32;_DEBUG"
....
</Configuration>
<Configuration
Name="Release|Win32"
....
PreprocessorDefinitions="WIN32;NDEBUG"
....
</Configuration>
Whereever I used the symbol _Debug it works perfect. For example:
#ifdef _DEBUG
#include "noexist.h"
#endif
produces an error
C1083: Cannot open include file: 'noexist.h': No such file or directory
when compiled as Debug while it compiles without error as Release.
OK.
Now comes that strange thing: The symbol _DEBUG is completely ignored in the file Resources.rc. Although Visual Studio itself inserts these lines:
VS_VERSION_INFO VERSIONINFO
FILEVERSION 1,0,0,1
PRODUCTVERSION 1,0,0,1
FILEFLAGSMASK 0x17L
#ifdef _DEBUG
FILEFLAGS 0x1L
#else
FILEFLAGS 0x0L
#endif
FILEOS 0x4L
FILETYPE 0x2L
FILESUBTYPE 0x0L
etc...
the flag _DEBUG (and also NDEBUG) do not exist in Resources.rc.
If I insert the same lines
#ifdef _DEBUG
#include "noexist.h"
#endif
into Resources.rc it does neither produce an error compiled as Debug nor as Release!
The same applies to
#ifdef NDEBUG
#include "noexist.h"
#endif
which compiles without error as Release and as Debug!
How is that possible ? How can a global compiler symbol be present in one file but not in another file ?
Is this a Visual Studio bug ?
(In pure C++ projects this works fine, this problem is only in my Managed C++ project)
Is there a workaround ?
来源：https://stackoverflow.com/questions/16850863/vs-ignores-symbol-debug-in-resources-rc-visual-studio-bug