Study: build times for D programs

[Joseph Rushton Wakeling]

On 26/07/12 15:42, Andrei Alexandrescu wrote:
>> If you can advise some flag combinations (for D and C++) you'd like to
>> see tested, I'll happily do them.
>
> The classic to ones are: (a) no flags at all, (b) -O -release -inline, (c) -O
> -release -inline -noboundscheck.

Here's a little table of DMD to GDC comparisons for the Dregs codebase:

                               ----------DMD----------    ----------GDC----------
compiler flags                compile time    runtime    compile time    runtime
-O -release -inline               0.43s           52s        1.51s           25s
-O -release                       0.35s           47s        1.50s           25s
-O -noboundscheck                 0.35s           56s        1.66s           25s
-O -inline                        0.47s        1m  5s        1.94s           45s
-O                                0.36s        1m  5s        1.98s           45s
-release -inline                  0.31s        1m  3s        0.63s        1m  3s
-release                          0.29s        1m  3s        0.63s        1m  3s
-inline                           0.32s        1m 24s        0.70s        1m 26s
-noboundscheck                    0.29s        1m 10s        0.666s       1m  9s
[none]                            0.29s        1m 24s        0.72s        1m 26s
-debug                            0.30s        1m 24s        0.70s        1m 26s
-unittest                         0.42s        1m 25s        0.75s        1m 26s
-debug -unittest                  0.42s        1m 25s        0.78s        1m 26s