[HOLD] Move from GCC to Clang

[johnmlee101]

Details

Fixed Issues

Fixes GH_LINK

Tests

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Internal Testing Reminder: when changing bedrock, please compile auth against your new changes

[johnmlee101]

Okay steps so far to get to where I'm at.

on the vm in a random spot

wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh 18 all

add /usr/lib/llvm-18/lib to the ldconfig

and right now its seems to fail on the linking and I'm stuck on compilation, the linker seems to not be working well with libc++ or importing it properly and it is returning

SSocketPool.cpp:(.text+0x2c): undefined reference to `std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::basic_string(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)'

and such which is failing compilation

[tylerkaraszewski]

-gdwarf-4 is here because otherwise clang outputs newer dwarf formats (version 5) than gnu ld will understand. We should be able get rid of this if we use clang's lld linker. For now, this outputs the older format.

[johnmlee101]

This pcre problem is a real head-scratcher- pcre hasn't been maintained in awhile so pcre2 is the way to go, but we might need a wrapper to properly drop-in install it.

[tylerkaraszewski]

It's used in only a few places. We could update code to use PCRE2 pretty easily, it's probably only a few lines.

[johnmlee101]

was trying to get gh actions working but llvm.sh is failing so will check on this later

[tylerkaraszewski]

I think this has been abandoned. Should we close this PR?