Daniël Mantione wrote:
Op Sat, 29 May 2004, schreef Matthias Hryniszak:
In addition comparing the sources of VCL and FCL they
don't differ that much and the source isn't that much bigger so by this kind
of differences the problem must lie with compiler/linker.
It *is* the source. The compiler is perfectly capapable of removing unused
code ust as well as the Delphi compiler. So, if you're pointing at the
compiler I assume you either have smartlinking disabled or that there is
debug information in the executable.
However, not much time has been spent to make sysutils, classes etc.
smaller. This effort has been done on the system unit in the past, which
can explain the difference.
But then again, while I don't use the FCL very much, if have not yet seen
examples of unacceptable sizes yet.
There are too many variables here to conclude decisively what is causing
it to be much bigger.
Some things that will affect executable size include:
1) Over zealous use of inlining (I dont see a command option to control
how much inlining is done)
2) Pascal variables not making efficient use of registers. This causes
more load/store instructions to be generated than is needed (also
produces less optimal code!)
3) Delphi includes a fair amount of assembler in its rtl.
You should also compare FPC smartlinking with the equivalent in the Gnu
linker (dead code elimantion?) to see if there really is a difference.
jamie.
Daniël
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