`zstd` v0.11.2 with feature "thin" failed on armv7/aarch64 musl and glibc due to missing symbols

[NobodyXu]

Checklist

• I've looked through the issues and pull requests for similar reports

Describe your issue

Enabling feature "thin" on zstd v0.11.2 caused the armv7/aarch64 build for musl and glibc to fail due to missing symbols.

cargo-bins/cargo-binstall#480

What target(s) are you cross-compiling for?

aarch64-unknown-linux-gnu, aarch64-unknown-linux-musl, armv7-unknown-linux-gnueabihf, armv7-unknown-linux-musleabihf

Which operating system is the host (e.g computer cross is on) running?

• macOS
• Windows
• Linux / BSD
• other OS (specify in description)

What architecture is the host?

• x86_64 / AMD64
• arm32
• arm64 (including Mac M1)

What container engine is cross using?

• docker
• podman
• other container engine (specify in description)

cross version

cross 0.2.4

Example

No response

Additional information / notes

No response

[Emilgardis]

The only thing this changes is (I think)
https://github.com/gyscos/zstd-rs/blob/94f79b0a7b2c4ffc4b8732bd180e662f453f72ef/zstd-safe/zstd-sys/build.rs#L138-L145

[Emilgardis]

Need to try this on a real machine

[NobodyXu]

Might be related to this https://github.com/gyscos/zstd-rs/pull/172/files

After I added fallback to -flto=thin (-flto) and fallback to -Oz (-Os and -O2), CI for x86-64-unknown-linux-gnu suddenly failed.

[Alexhuszagh]

@NobodyXu Can you post the missing symbols?

[NobodyXu]

The error looks something like this:

  = note: /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libbinstall_zip-3ec920b13b440940.rlib(binstall_zip-3ec920b13b440940.binstall_zip.2d8b1d46-cgu.14.rcgu.o): in function `zstd_safe::DCtx::decompress_stream':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:907: undefined reference to `ZSTD_decompressStream'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::is_error':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:66: undefined reference to `ZSTD_isError'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::get_error_name':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:665: undefined reference to `ZSTD_getErrorName'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::DCtx::try_create':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:707: undefined reference to `ZSTD_createDCtx'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::DCtx::init':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:784: undefined reference to `ZSTD_initDStream'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::DCtx::reset':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:822: undefined reference to `ZSTD_DCtx_reset'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::DCtx::load_dictionary':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:832: undefined reference to `ZSTD_DCtx_loadDictionary'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `zstd_safe::DCtx::in_size':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:920: undefined reference to `ZSTD_DStreamInSize'
          /usr/local/bin/../lib/gcc/arm-linux-musleabihf/9.2.0/../../../../arm-linux-musleabihf/bin/ld: /target/armv7-unknown-linux-musleabihf/debug/deps/libzstd_safe-9534da256530e36e.rlib(zstd_safe-9534da256530e36e.zstd_safe.5be749e1-cgu.9.rcgu.o): in function `<zstd_safe::DCtx as core::ops::drop::Drop>::drop':
          /cargo/registry/src/index.crates.io-e139d0d48fed7772/zstd-safe-5.0.2+zstd.1.5.2/src/lib.rs:993: undefined reference to `ZSTD_freeDCtx'
          collect2: error: ld returned 1 exit status

It's missing ZSTD_* symbols, which should be provided by zstd-sys but somehow enabling feature "thin" cause them to be missing.