Build failure on Alpine Linux

[catarial]

Version

24.05

Plugin type

Native / JACK, AU, CLAP, LV2, VST2, VST3

OS

Alpine Linux 3.20 x86_64

DAW / Host (if applicable)

No response

Description

I removed calls to backtrace and backtrace_symbols so that it would compile since musl does not include execinfo.h. I assume this won't break functionality since those functions are just for debugging.

Then in the linking stage it fails to find roundevenf and some fts functions.

make -C Cardinal
make[2]: Entering directory '/mnt/data/src/Cardinal/src/Cardinal'
Creating CLAP plugin for Cardinal
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ../../plugins/plugins.a(LFO.cpp.o): in function `LFO::process(rack::engine::Module::ProcessArgs const&)':
LFO.cpp:(.text._ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE[_ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE]+0x3ce): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: LFO.cpp:(.text._ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE[_ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE]+0x3f2): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: LFO.cpp:(.text._ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE[_ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE]+0x423): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: LFO.cpp:(.text._ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE[_ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE]+0x455): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: LFO.cpp:(.text._ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE[_ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE]+0x540): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ../../plugins/plugins.a(LFO.cpp.o):LFO.cpp:(.text._ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE[_ZN3LFO7processERKN4rack6engine6Module11ProcessArgsE]+0x564): more undefined references to `roundevenf' follow
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ../../carla/build/modules/Release/ysfx.a(ysfx_utils_fts.cpp.o): in function `ysfx::visit_directories(char const*, bool (*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, void*), void*) [clone .cold]':
ysfx_utils_fts.cpp:(.text.unlikely._ZN4ysfx17visit_directoriesEPKcPFbRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPvESA_+0xc): undefined reference to `fts_close'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ../../carla/build/modules/Release/ysfx.a(ysfx_utils_fts.cpp.o): in function `ysfx::visit_directories(char const*, bool (*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, void*), void*)':
ysfx_utils_fts.cpp:(.text._ZN4ysfx17visit_directoriesEPKcPFbRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPvESA_+0x46): undefined reference to `fts_open'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ysfx_utils_fts.cpp:(.text._ZN4ysfx17visit_directoriesEPKcPFbRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPvESA_+0x8b): undefined reference to `fts_read'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ysfx_utils_fts.cpp:(.text._ZN4ysfx17visit_directoriesEPKcPFbRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPvESA_+0xa7): undefined reference to `fts_close'
/usr/lib/gcc/x86_64-alpine-linux-musl/13.2.1/../../../../x86_64-alpine-linux-musl/bin/ld: ysfx_utils_fts.cpp:(.text._ZN4ysfx17visit_directoriesEPKcPFbRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEPvESA_+0x148): undefined reference to `fts_close'
collect2: error: ld returned 1 exit status
make[2]: *** [../../dpf/Makefile.plugins.mk:754: ../../bin/Cardinal.clap/Cardinal.clap] Error 1
make[2]: Leaving directory '/mnt/data/src/Cardinal/src/Cardinal'
make[1]: *** [Makefile:128: all] Error 2
make[1]: Leaving directory '/mnt/data/src/Cardinal/src'
make: *** [Makefile:137: cardinal] Error 2

[dromer]

I see a patch for this kind of limitation in WebKit: https://github.com/WebKit/WebKit/pull/34972/files
(for roundevenf at least)

[falkTX]

The original VCV Rack and modules do not support musl, so we are always going to have troubles with this.

Best course of action here is to first add some CI job that tests build under alpine, so we can catch any errors.
Then we start fixing things until the build succeeds.