Il mismatch between 'P1' version '20080116' and 'P2' version '20070207'

Question

I am building MFC application which uses other c++ library.I am using vs 2008 and compiled all the library project in vs 2008.

It is compiling well in debug mode but failed to run in Debug Unicode mode,Release,Release Unicode mode.

I found in the net that VS 2008SP1 is required to be installed but how come it is compiling in debug mode.

Please suggest how to overcome this problem.

Answer 1

If compiling a solution with multiple projects you should compile all projects with the same compiler (version) to be sure it works.

I once got the same error message like you. If I remember correctly the problem occured because link time code generation was used. My solution was to rebuild all, another solution might have been disabling link time code generation.

Answer 2

In Microsoft terminology, P1 is the parser (front-end), and P2 is the code generator (back-end). With link-time code generation (LTGC) enabled, the result of P1 is stored in a file and P2 is performed later at link time.

If you downgraded your compiler, you should do a full rebuild, otherwise the link step will try to use the incompatible P1 output, which will trigger that error.

If you upgraded the compiler, Visual Studio automatically does a full rebuild, so this should never happen (if it does anyway, just perform a full rebuild).