Undefined reference to roundeven functions

[mbsmith]

I did a little poking around and didn't find the source of this issue. It seems like it should be using the gcc builtins for this, but instead are looking to musl which doesn't implement those at the moment. I did at least verify that this gcc version has those builtins via __has_builtin.

Compiler: GCC 14.2.0
Libc: Musl 1.2.5
test command: meson test --no-rebuild --print-errorlogs -C output

ninja: job failed: gcc  -o test/arm/neon/rndn-native-c test/arm/neon/rndn-native-c.p/rndn.c.o -Wl,--as-needed -Wl,--no-undefined -pie -Wl,--as-needed,-O1,--sort-common -Wl,-z,pack-relative-relocs -Os -fstack-clash-protection -Wformat -Werror=format-security -fno-plt -lm
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndnq_f64':
rndn.c:(.text+0x619): undefined reference to `roundeven'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndn_f32':
rndn.c:(.text+0x6cb): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndnh_f16':
rndn.c:(.text+0x7d6): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndn_f64':
rndn.c:(.text+0x940): undefined reference to `roundeven'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndnq_f32':
rndn.c:(.text+0x9db): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndnq_f16':
rndn.c:(.text+0xafc): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-native-c.p/rndn.c.o: in function `test_simde_vrndn_f16':
rndn.c:(.text+0xc36): undefined reference to `roundevenf'
collect2: error: ld returned 1 exit status
ninja: job failed: gcc  -o test/arm/neon/rndn-emul-c test/arm/neon/rndn-emul-c.p/rndn.c.o -Wl,--as-needed -Wl,--no-undefined -pie -Wl,--as-needed,-O1,--sort-common -Wl,-z,pack-relative-relocs -Os -fstack-clash-protection -Wformat -Werror=format-security -fno-plt -lm
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndnq_f64':
rndn.c:(.text+0x619): undefined reference to `roundeven'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndn_f32':
rndn.c:(.text+0x6cb): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndnh_f16':
rndn.c:(.text+0x7d6): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndn_f64':
rndn.c:(.text+0x940): undefined reference to `roundeven'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndnq_f32':
rndn.c:(.text+0x9db): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndnq_f16':
rndn.c:(.text+0xafc): undefined reference to `roundevenf'
/usr/lib/gcc/x86_64-alpine-linux-musl/14.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: test/arm/neon/rndn-emul-c.p/rndn.c.o: in function `test_simde_vrndn_f16':
rndn.c:(.text+0xc36): undefined reference to `roundevenf'
collect2: error: ld returned 1 exit status
ninja: subcommands failed

[mr-c]

Yes, this sounds correct. emscripten uses musl and ran into this as well:

simde/simde/simde-math.h

Line 1269 in bd05320

((!defined(HEDLEY_EMSCRIPTEN_VERSION) || HEDLEY_EMSCRIPTEN_VERSION_CHECK(3, 1, 43)) && HEDLEY_HAS_BUILTIN(__builtin_roundeven)) || \

One could add a SIMDE_MUSL (or similar) to also skip the use of __builtin_roundeven for other musl users, unless there is a way for a header-only library to detect the use of musl at compile time

[mr-c]

ah, maybe there is a way to detect musl!

https://stackoverflow.com/a/78062291/1585509