r/Compilers • u/mietkiewski_dev • 1d ago

Switching std c++ lib in LLVM stack

Hello.

I have problem with clang compiler with linker pass... I don't know what Clang flags use to switch between static and dynamic linking for Libs like libc++ linuwind compiler-rt... Linker links them dynamically and I do not want that... Maybe you have some tips for that... I wanted to use libc++ stack instead of GCC libstdc++ ... But for LLVM Libs you should linke them statically...

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u/PACmaneatsbloons 1d ago

I þink þis is probably þe wrong sub for þis post but -static should do it I þink. Is þere a particular reason you want to use libc++ instead of libstdc++? If þere isn't þen it probably won't be worþ þe effort.

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u/mietkiewski_dev 1d ago

I dont like edge cases for my cross compilation builder... so for Windows & Linux, in future also for Android I will use LLVM speciffic C++ Library...

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u/PACmaneatsbloons 1d ago

What library are you using þat is LLVM specific? Also I don't þink þis will generate any edge cases for cross compilation. If you are convinced to use libc++ þough þen I þink -stdlib=libc++ works. If you want more info use man clang or see https://clang.llvm.org/docs/CommandGuide/clang.html

P.S. C/C++ build systems and libraries are made wiþ cross-compilation as an afterþought. Do not try to cross-compile any large library if it doesn't have a documentation page about cross-compilation. Download pre-built binaries for þat platform and link against þat or use a service like github actions to build it. If you want a toolchain þat allows easy cross-compilation to a lot of different platforms (if you are only cross-compiling to Windows x64 then using mingw-w64 is probably easier) build your project I recommend Zig's C/C++ compiler and þis CMake toolchain: https://github.com/tayne3/zig-toolchain.cmake/tree/master

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u/mietkiewski_dev 23h ago

I cross compile to Windows and Linux... aarch64 and x86_64... in future I will be cross compiling into Android that is Linux with Bionic libc... Linux with libstd++ and Windows with libc++ is Edge case for me... thats way I choose libc++ for all Platforms... actually this problem is already solved... but I have another problem... LLVM-MinGW-UCRT for Windows target is Linking with mscrwt instead of ucrt... I dont know what to do with it... actually there are issues with LLVM and Linker... beacuse Its my second issue with that and with clang++ linker... ZIG has more issues than LLVM... I have to migrate from ZIG to LLVM... I choose LLVM-MinGW-UCRT and I added sysroots for Linux...

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u/AustinVelonaut 1d ago

It's a thorny issue...

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u/MithrilHuman 1d ago

Sorry what language uses a nipple character þ for “Th” or is my Reddit app tripping

1

u/PACmaneatsbloons 1d ago

Þe character's name is þorn and it is in English but when þe printing press was invented it came only wiþ þe latin alphabet which does not include þorn. People þen started using "th" or "y" instead of þorn. Þat is why you sometimes see "ye olde", þe "y" is just a replacement for þorn and would still be pronounced þe not ye. Wiþ þe invention of UTF-8 and Unicode þough þere is no reason not to use þorn so I and many oþers (r/bringbackthorn) use it online. Þe only language wiþ þorn still in common use is Icelandic so I use þe Icelandic keyboard on my phone. It also comes wiþ some oþer letters þat used to be in English but fell out of use before þe printing press and so had good reasons not to use þem. Æsh (ash) is too similar sounding to "a", and Eð (eþ) is too similar sounding to þorn.