mosra/magnum

Lightweight and modular C++11/C++14 graphics middleware for games and dataviz

Vladimír Vondruš

@mosra

at this point i would just throw all binaries away and start over

DaeMon87

@DaeMon87

Ill give that a shot much thanx for the help

Vladimír Vondruš

@mosra

you're welcome, DLL hell is the worst

Tracy Ma

@linuxaged

sometimes Magnum C++ Docs online searching page loads quite slowly, i'm in China mainland.

Vladimír Vondruš

@mosra

the search data are huge, i need to figure out some better caching

Tracy Ma

@linuxaged

i guessed this may be a network problem, many websites are not accessable here 😔

Vladimír Vondruš

@mosra

i'm hosting this on a local cloud provider in central Europe, which should hopefully be not affected by any political or whatever whims like the US-centric ones are

and also hopefully small enough to be a target of some censorship effort

Vladimír Vondruš

@mosra

anybody using std::string_view?

Vladimír Vondruš

@mosra

asking so i know if i should provide conversion of it to corrade's StringView or if that can wait for later

Tracy Ma

@linuxaged

Corrade container is prefered in our magnum project, lightweight and cross-platform consistent

Janos95

@Janos95

i am using string view, but if corrade provides one I would just switch :)

none of the libraries i am using, uses std string views, so that's pretty easy.

Vladimír Vondruš

@mosra

An appointed successor can manage your public repositories after presenting a death certificate then waiting for 7 days or presenting an obituary then waiting for 21 days.

does github know something i don't?! :scream:

Janos95

@Janos95

haha thats pretty morbid

Konstantinos Chatzilygeroudis

@costashatz

Hahahha

Jonathan Hale

@Squareys

does github know something i don't?! :scream:

I think all bigger open source projects are getting this :P

Janos95

@Janos95

just noticed this :

"echo "#include <algorithm>" | gcc-head -std=c++11 -P -E -x c++ - | wc -l" returns 11765

while

"echo "#include <algorithm>" | gcc-head -std=c++20 -P -E -x c++ - | wc -l" returns a whopping 45222

compiling an empty file including the algorithm header takes 0.15 sec (with c++11) vs 0.9 sec (with c++20)

Vladimír Vondruš

@mosra

hah, i thought you'd compare that to gcc 9

Janos95

@Janos95

I chased the includes and it turns out that <algorithm> transitively includes <ranges> which is 30 loc and contains lots of template stuff

Vladimír Vondruš

@mosra

because this happened for gcc 10, so i expected improvements: https://twitter.com/wakomeup/status/1196097492456214529

#include <ranges> is a fireable offense, then

Janos95

@Janos95

yes I can live without <ranges> in largish projects, but abondoning std::sort etc is not really an options :/

Vladimír Vondruš

@mosra

damn, right

i was just about to ask what exactly do you need from there

isn't it in some utility / internal header on gcc? so i could do another Utility/StlMath.h "deshittifier" but for <algorithm>

personally even the 0.15 sec was too much for me and so <algorithm> is included almost nowhere in magnum

another option: don't use c++20 :D

Janos95

@Janos95

yes I think one can include

#include <bits/stl_algobase.h>
#include <bits/stl_algo.h>

not sure about other platforms

another option: don't use c++20 :D

but I already changed all my enable_if's to requires clauses :laughing:

Janos95

@Janos95

personally even the 0.15 sec was too much for me and so <algorithm> is included almost nowhere in magnum

should I compare compile times?

Vladimír Vondruš

@mosra

of magnum? :D

Vladimír Vondruš

@mosra

you might need to force the -std in CMAKE_CXX_FLAGS, otherwise it'll use 11

Janos95

@Janos95

with DCMAKE_CXX_STANDARD=11 it is 17.43 seconds and with DCMAKE_CXX_STANDARD=20 it is 22.13 seconds. Very unscientific, average of two parallel debug compiles, but variance was quit low, about 0.5 seconds maybe.

but interestingly it is about 1.5 slower than my system gcc, maybe I messed up compiling gcc, so everything with a grain of salt.

you might need to force the -std in CMAKE_CXX_FLAGS, otherwise it'll use 11

ah ok, I'll check one moment.

Vladimír Vondruš

@mosra

wow, 17 seconds, that's better than i remember

Janos95

@Janos95

yeah it was parallel with 14 cores

Vladimír Vondruš

@mosra

ahah okay

people with fast machines

was it with all tests?

or just the libs

libs alone i remember were around 20 seconds last time i checked, on a 8-core machine

Janos95

@Janos95

ah no, no tests. Good point.

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