• Imperatorn (17/17) Sep 28 2023 Today I randomly tried compiling a hello world using DMD, LDC and
• Imperatorn (2/19) Sep 28 2023 Oops, typo, I actually posted it in learn :D

Imperatorn <johan_forsberg_86 hotmail.com> writes:

Today I randomly tried compiling a hello world using DMD, LDC and 
gcc (yes, not gdc)

I compared binary sizes and something looked off. The D ones were 
much larger.

Sometimes 10x, with some optimizations still about 2x.

But, then I tried using shared default lib and the size is even 
smaller than the one produced by gcc -Os!

I just did two versions, one with betterC with extern(C) and one 
with std.stdio : printf
(I didn't try dmd since I couldn't figure out easily how to share 
lib)

[1] ldc2 -O -release -link-defaultlib-shared -betterC app.d
[2] ldc2 -O -release -link-defaultlib-shared app.d

Both are smaller than the gcc-version.

How is this possible? What are the consequences and trade-offs?

Maybe this should have been posted in Learn instead, but idk.

Thanks

Imperatorn <johan_forsberg_86 hotmail.com> writes:

On Thursday, 28 September 2023 at 08:38:42 UTC, Imperatorn wrote:
 Today I randomly tried compiling a hello world using DMD, LDC 
 and gcc (yes, not gdc)

 I compared binary sizes and something looked off. The D ones 
 were much larger.

 Sometimes 10x, with some optimizations still about 2x.

 But, then I tried using shared default lib and the size is even 
 smaller than the one produced by gcc -Os!

 I just did two versions, one with betterC with extern(C) and 
 one with std.stdio : printf
 (I didn't try dmd since I couldn't figure out easily how to 
 share lib)

 [1] ldc2 -O -release -link-defaultlib-shared -betterC app.d
 [2] ldc2 -O -release -link-defaultlib-shared app.d

 Both are smaller than the gcc-version.

 How is this possible? What are the consequences and trade-offs?

 Maybe this should have been posted in Learn instead, but idk.

 Thanks

Oops, typo, I actually posted it in learn :D