The documentation for the DIA SDK claims that the header file is located at include\dia2.h. However, the following program fails to compile:
#include <include\dia2.h>
int main() {}
The full error diagnostic is
error C1083: Cannot open include file: 'include\dia2.h': No such file or directory
What's the issue and how do I solve it?
The DIA SDK isn't part of the platform SDK. Its artifacts aren't immediately available and must be explicitly introduced into the build system, like any old library.
For MSBuild-based systems, like Visual Studios, you'll want to navigate to "VC++ Directories" and add $(VSInstallDir)DIA SDK\include to "Include Directories", or add
<IncludePath>$(VSInstallDir)DIA SDK\include;$(IncludePath)</IncludePath>
to the respective items in the .vcxproj file. This has to be done for "All Configurations" and "All Platforms".
When building from the command line, use the /I <dir> compiler option. From a Visual Studio Command Prompt, the following will successfully build an object file:
cl /I "%VSINSTALLDIR%DIA SDK\include" main.cpp
Doing the above and changing the code to
#include "dia2.h"
int main() {}
successfully compiles. This is following what the Dia2dump sample does. The sample is installed into %VSINSTALLDIR%DIA SDK\Samples\DIA2Dump.