Can't compile with target=x86_64-unknown-linux-musl

[jarod]

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:        16.04
Codename:       xenial

$ sudo apt install libssl-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libssl-dev is already the newest version (1.0.2g-1ubuntu4.1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

Build failed, waiting for other jobs to finish...
error: failed to run custom build command for `openssl-sys-extras v0.7.14`
Process didn't exit successfully: `/home/jarod/workspace/rust/aws-api-tools/target/release/build/openssl-sys-extras-5c7e4d8925825f00/build-script-build` (exit code: 101)
--- stdout
TARGET = Some("x86_64-unknown-linux-musl")
OPT_LEVEL = Some("3")
PROFILE = Some("release")
TARGET = Some("x86_64-unknown-linux-musl")
debug=false opt-level=3
HOST = Some("x86_64-unknown-linux-gnu")
TARGET = Some("x86_64-unknown-linux-musl")
TARGET = Some("x86_64-unknown-linux-musl")
HOST = Some("x86_64-unknown-linux-gnu")
CC_x86_64-unknown-linux-musl = None
CC_x86_64_unknown_linux_musl = None
TARGET_CC = None
CC = None
HOST = Some("x86_64-unknown-linux-gnu")
TARGET = Some("x86_64-unknown-linux-musl")
HOST = Some("x86_64-unknown-linux-gnu")
CFLAGS_x86_64-unknown-linux-musl = None
CFLAGS_x86_64_unknown_linux_musl = None
TARGET_CFLAGS = None
CFLAGS = None
running: "musl-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-m64" "-fPIC" "-static" "-o" "/home/jarod/workspace/rust/aws-api-tools/target/x86_64-unknown-linux-musl/release/build/openssl-sys-extras-5c7e4d8925825f00/out/src/openssl_shim.o" "-c" "src/openssl_shim.c"
ExitStatus(ExitStatus(256))


command did not execute successfully, got: exit code: 1



--- stderr
src/openssl_shim.c:1:26: fatal error: openssl/hmac.h: No such file or directory
compilation terminated.
thread '<main>' panicked at 'explicit panic', /home/jarod/.cargo/registry/src/github.1485827954.workers.dev-1ecc6299db9ec823/gcc-0.3.32/src/lib.rs:848
note: Run with `RUST_BACKTRACE=1` for a backtrace.

[sfackler]

What is the output when you run this command?

"musl-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-m64" "-fPIC" "-static" "-o" "/home/jarod/workspace/rust/aws-api-tools/target/x86_64-unknown-linux-musl/release/build/openssl-sys-extras-5c7e4d8925825f00/out/src/openssl_shim.o" "-c" "src/openssl_shim.c"

[jarod]

rust-openssl/openssl-sys-extras$ "musl-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-m64" "-fPIC" "-static" "-o" "/home/jarod/workspace/rust/aws-api-tools/target/x86_64-unknown-linux-musl/release/build/openssl-sys-extras-5c7e4d8925825f00/out/src/openssl_shim.o" "-c" "src/openssl_shim.c"
src/openssl_shim.c:1:26: fatal error: openssl/hmac.h: No such file or directory
compilation terminated.

[jarod]

After some digging. I think openssl-sys-extra won't compile with the libssl-dev from apt repository anyway. There is some compiler(?) specified stuff locate in /usr/include/x86_64-linux-gnu/openssl/. I think I need to compile openssl with musl first.

[aidanhs]

Some other crates I'm familiar with:

• libz-sys compiles zlib itself if it detects the musl target (or some other conditions). Requires make and a C compiler. Takes about 3s to compile (if enabled).
• ssh2-sys compiles libssh2 unconditionally. Requires cmake, make, a C compiler and system openssl libraries/headers. Takes about 5s to compile.

If openssl-sys supported compiling openssl itself (via detecting musl or an environment variable like VENDORED_OPENSSL) it would require the end user to have perl, make and a C compiler and would take about 45s to compile a default configuration of openssl. There is precedent for this (per the other crates) - what do you think?

[sfackler]

I would be uncomfortable being on the hook for rushing out new releases of openssl-sys whenever OpenSSL fixes some critical security vulnerability.