C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\Microsoft.CppCommon.targets(151,5): warning MSB8015: Forcing a rebuild of all source files due to the contents of ".........\Debug\custombuild.command.1.tlog" being invalid.
Don't despair. I tried googling it and came up with a total of 3 (THREE) results in the whole web, two being in Korean. Yikes.
In any case, the solution was rather simple - check line ending inside the project file. If for some reason (due to being committed to SCM incorrectly, or something of similar nature) it has improper line endings, VS2010 will think that you have bad symbols inside build commands and make the build result invalid.
In my case, I had CR-CR-LF line endings - which, after being changed to CR-LF - solved the issue.
