////////////////////////////// // Version 1.10 // Jan 23rd, 2000 // Version 1.00 // May 20th, 1999 // Todd C. Wilson, Fresh Ground Software // (todd@nopcode.com) // This header file will kick in settings for Visual C++ 5 and 6 that will (usually) // result in smaller exe's. // The "trick" is to tell the compiler to not pad out the function calls; this is done // by not using the /O1 or /O2 option - if you do, you implicitly use /Gy, which pads // out each and every function call. In one single 500k dll, I managed to cut out 120k // by this alone! // The other two "tricks" are telling the Linker to merge all data-type segments together // in the exe file. The relocation, read-only (constants) data, and code section (.text) // sections can almost always be merged. Each section merged can save 4k in exe space, // since each section is padded out to 4k chunks. This is very noticable with smaller // exes, since you could have only 700 bytes of data, 300 bytes of code, 94 bytes of // strings - padded out, this could be 12k of runtime, for 1094 bytes of stuff! // Note that if you're using MFC static or some other 3rd party libs, you may get poor // results with merging the readonly (.rdata) section - the exe may grow larger. // To use this feature, define _MERGE_DATA_ in your project or before this header is used. // With Visual C++ 5, the program uses a file alignement of 512 bytes, which results // in a small exe. Under VC6, the program instead uses 4k, which is the same as the // section size. The reason (from what I understand) is that 4k is the chunk size of // the virtual memory manager, and that WinAlign (an end-user tuning tool for Win98) // will re-align the programs on this boundary. The problem with this is that all of // Microsoft's system exes and dlls are not tuned like this, and using 4k causes serious // exe bloat. Very noticable for smaller programs. // The "trick" for this is to use the undocumented FILEALIGN linker parm to change the // padding from 4k to 1/2k, which results in a much smaller exe - anywhere from 20%-75% // depending on the size. #ifdef NDEBUG #pragma message( "Using AggressiveOptimise" ) // /Og (global optimizations), /Os (favor small code), /Oy (no frame pointers) #pragma optimize("gsy",on) #pragma comment(linker,"/RELEASE") // Note that merging the .rdata section will result in LARGER exe's if you using // MFC (esp. static link). If this is desirable, define _MERGE_RDATA_ in your project. #ifdef _MERGE_RDATA_ #pragma comment(linker,"/merge:.rdata=.data") #endif // _MERGE_RDATA_ #pragma comment(linker,"/merge:.text=.data") //#pragma comment(linker,"/merge:.reloc=.data") #if _MSC_VER >= 1000 // Only supported/needed with VC6; VC5 already does 0x200 for release builds. // Totally undocumented! And if you set it lower than 512 bytes, the program crashes. // Either leave at 0x200 or 0x1000 #pragma comment(linker,"/FILEALIGN:0x200") #endif // _MSC_VER >= 1000 #endif // NDEBUG