Hi, I have a lot of boost files in a precompiled header, and compiling that precompiled header using boost 1.34.1 caused no errors. However, now that I've upgraded to 1.35, I'm getting the following error during PCH generation in MSVC9: 2>c:\it\tfs\crusades\sdks\boost\boost\filesystem\operations.hpp(827) : error C3859: virtual memory range for PCH exceeded; please recompile with a command line option of '-Zm112' or greater 2>c:\it\tfs\crusades\sdks\boost\boost\filesystem\operations.hpp(827) : fatal error C1076: compiler limit : internal heap limit reached; use /Zm to specify a higher limit The recommended fix in the error text resolves the problem, but I'm wondering why this is a problem in the first place. As I stated before, the earlier versions of boost never did this. Is this a bug?