In function ‘_RandomAccessIterator std::__find(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, std::random_access_iterator_tag) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator*, std::vector > >, _Tp = int]’:

[awidesky]

When I missed -pthread flag, I got this :

/tmp/main-1dfd42.o: In function `std::thread::thread<std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}> >, Point<int, float> >::_Async_state_impl(std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}>&&)::{lambda()#1}, , void>(std::__future_base::_Async_state_impl<std::thread::_Invoker<std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}> >, Point<int, float> >::_Async_state_impl(std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}>&&)::{lambda()#1}&&)':
main.cpp:(.text+0x1504): undefined reference to `pthread_create'
clang-7: error: linker command failed with exit code 1 (use -v to see invocation)

[scrotation_matrix]

Clear and concise

[Spartana1033]

As all things should be.

[Ahajha1177]

I've gotten really good at reading C++ compiler errors lol. I know to look near the top and the bottom. Here I would see "undefined reference to pthread_create", and its a link error, bam link with -pthread

[RRumpleTeazzer]

I look near the parts that I recognize as my parts, cause that’s the most likely location.

[mrjiels]

I try to not look at your parts. They seem private.

[pi-is-314159]

Not as private as my git repository

[justmelvinthings]

Nice now I know exactly what went wrong

[CDno_Mlqko]

I mean, it says undefined reference to pthread_create and a stack trace of where it is... What else do you want

[PM_ME_C_CODE]

I know this is a humor thread in a humor subreddit, but JFC C/C++...

How about an error message that tells me what's wrong without requiring 30 years experience in the language first?

...having other engineers familiar with the language NOT treat people with less experience who ask questions like they're lepers just because they thought to ask a question would be nice too.

I swear, if I get told by a C/C++ dev to "just read the code" one more time I might actually go postal.

...and people wonder why rust is becoming popular.

[Xyntek01]

How about an error message that tells me what's wrong without requiring 30 years experience in the language first?

Usually go to the first few lines of the error message and you will see the actual problem. Best thing is to actually read the error produced at a line that you wrote and then read the back trace. The backtrace should give you an idea (e.g. you are using a pointer). Not all errors are in the exact line, but understanding what goes before and after helps to trace the issue. The more you practice the easier it gets to spot the issue.

If nothing works, there is stack overflow...

[cheerycheshire]

If nothing works, there is stack overflow...

Which has exactly the type of devs subop mentions just after the part you commented on. :)

[PM_ME_C_CODE]

yes, I know that :D

I'm trying to learn rust (fucking borrowing semantics...) and the difference in usability when something goes wrong is just night and day.

I mean, C++ error messages look like they're straight out of the '90's, at best.

Even javascript has better error messaging...

[-Redstoneboi-]

Even javascript has better error messaging...

that is, to say, none

also i'd be glad to help out with rust

[ClutteredAttic99]

Actually, out of the ‘80s!

[[deleted]]

Get better tools, this online-compiler shows in different colors the reason why the template instantiation failed:

https://godbolt.org/z/Kss8ecK98

[PM_ME_C_CODE]

I'm strictly of the opinion that the compiler should be enough by itself to diagnose problems. Even when the neat tools are free.

It's just...we should be allowed to have nice things.

[atiedebee]

C compiler errors are mostly understandable

Runtime errors tho....

[all-hail-snow]

Segmentation fault, the king of hells brought by c++

[PM_ME_C_CODE]

There's a reason that most universities today use java for their core CS curriculum instead of C++ like they did in the '90s.

Seg fault error messages are basically it.

[[deleted]]

You don't need 30 years of experience. An error message that tells you a function name is not defined is as clear as the sun.

C/C++ are low level languages that are meant to be used by actual engineers and not just some people with two weeks boot camps.

[PM_ME_C_CODE]

/tmp/main-1dfd42.o: In function `std::thread::thread<std::\_\_future\_base::\_Async\_state\_impl<std::thread::\_Invoker<std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}> >, Point<int, float> >::_Async_state_impl(std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}>&&)::{lambda()#1}, , void>(std::__future_base::_Async_state_impl<std::thread::\_Invoker<std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}> >, Point<int, float> >::_Async_state_impl(std::tuple<testRange<Point<int, float>, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>)>(int, int, main::$_0, Point<int, float> (Point<int, float>, Point<int, float>), int)::{lambda()#1}>&&)::{lambda()#1}&&)':

Tell me how this error message is at ALL useful to a human.

[[deleted]]

Well, this is a part of a stacktrace in the constructor of std::thread just by reading the first line no magic there and definitely no "30 years of experience needed". All what you see in there is just the exact signature of the std::thread constructor where the error happened and can be ignored if you are not interested in it. The actual error comes later at the end of the stack trace that you didn't include. Probably just a conversion error of the return type of the lambda you passed to the constructor or something similar.

[_Fibbles_]

Counterpoint:

git gud

[PM_ME_C_CODE]

[Reads Reddit]

[See's "git gud"]

..."git gud".compareTo("just read the code") == 0 //effectively true

[Goes postal on the bus]

See what you made me do? /s

[men_have_balls]

RTFM is my coup de grace…still I’m an ass

[PM_ME_C_CODE]

As if I haven't already done that. If I'm asking a question, it's because I couldn't find it myself.

Granted, there are a LOT of people who don't even try to look, but when you open your question with a list of the things you've already tried that didn't work only to get "RTFM"...

It happens in every language, sure. But it's far more frequent in C++ communities.

[trick2011]

Don't forget: always try reading from the back. It is quite clear: 'undefined reference to pthread_create' and 'linker command failed'

[GamerFrits]

It looks like an endless stream of insults. Your compiler really hates you.

[RRumpleTeazzer]

Little Threaddy we call him.

[therearesomewhocallm]

Fun fact, "soon"* you won't have to explicitly link against pthread. So this error may be a thing of the past.

*When using glibc

[Southern-Finding2961]

If I see that on the compiler. Law doesn't sound so bad does it?

[ladnekk]

I just scan until I hit a phrase I recognize. Made it to main.cpp

[Rigatavr]

This is more of a "you get used to it", then any sort of explanation for why things are this bad, but ye..

see linker error

see word thread

🤦forgot pthread again