C++ brew install library not found during compile (OSX)

[spacecat921]

Hi!

Running on a macbook air 15" 2023 trying to run a simple text manipulation program. I added cryptopp through homebrew but the library isn't found when i compile my code.

Xcode is up-to date, discovered if that's not there, then nothing works. I don't use Xcode because the keyboard short cuts are different than what i'm used to. I'm used to coding in sublime for my job so that's what i'm using.

I can see that the library is installed in my cellar, but it can't be found.

Currently not using cmake because i'm not sure how to use it. I manage the very small number of files used for this project in a perl script.

I ran into a similar issue when i tried to use pybind/python.h to use that for decoding text. I added the Cellar manually to my PATH but that didn't change the results.

Please help!

[ZhongRuoyu]

You probably need to add -I"$(brew --prefix cryptopp)/include" as a CXXFLAG (i.e., when compiling) and -L"$(brew --prefix cryptopp)/lib" as an LDFLAG (i.e., when linking). Compilers won't check these locations unless you tell them to.

[spacecat921]

Thanks! I tried that and it didn't change. (Added to command line, also ran the brew command and copied the result in place of the command just in case formatting was being wierd)

-print-search-dirs only reports Xcode directories being searched. This, i think is the root of the problem.

[ZhongRuoyu]

This minimal example works for me:

$ cat test.cc                                            
#include <cryptopp/integer.h>

int main() {
  CryptoPP::Integer x = 0;
  return static_cast<int>(x.ConvertToLong());
}
$ c++ -c test.cc -o test.o -I"$(brew --prefix cryptopp)/include"   
$ c++ test.o -o test -L"$(brew --prefix cryptopp)/lib" -lcryptopp
$ ./test

Can you share what commands you are using to compile your code? What specific errors have you encountered?

[spacecat921]

I switched to my linux box and this works perfectly! I don't know what's up with my macbook.

[gromgit]

To move forward, answering the questions that were posed:-

Can you share what commands you are using to compile your code? What specific errors have you encountered?

and showing what happens when you compile the minimal example that @ZhongRuoyu shared are probably required.