Am 20.12.2011, 16:00 Uhr, schrieb Denis Shelomovskij
<verylonglogin....@gmail.com>:
The second dmd issue (that was discovered because of 99.00% of zeros) is
that _it doesn't use bss section_.
Lets look at the C++ program built using Microsoft's cl:
---
char arr[1024 * 1024 * 10];
void main() { }
---
It resultis in ~10KiB executable, because `arr` is initialized with zero
bytes and put in bss section. If one of its elements is set to non-zero:
---
char arr[1024 * 1024 * 10] = { 1 };
void main() { }
---
The array can't be in .bss any more and resulting executable size will
be increased by adding ~10MiB. The following D program results in ~10MiB
executable:
---
ubyte[1024 * 1024 * 10] arr;
void main() { }
---
So, if there really is a reason not to use .bss, it should be clearly
explained.
If described issues aren't much more significant than "static this()",
show me where am I wrong, please.
+1. I didn't know about .bss, but static arrays of zeroes (global, struct,
class) increasing the executable size looked like a problem wanting a
solution. I hope it is easy to solve for dmd and is just an unimportant
issue, so was never implemented.
