static compilation issue with openssl

[sam0x17]

A blocker for me right now is the fact that crystal programs that require "openssl" do not seem to statically compile on any of the community-managed static compilation docker images. I have set up a repo that reproduces this by running the "./build_static" bash script in the root of the project. Perhaps there are some additional dev packages that need to be included on alpine? Would highly appreciate it if someone weighs in on this. Currently this is pushing me to develop my program in rust instead, since it's openssl library compiles perfectly without any dependencies on linux + osx + windows.

repo: https://github.com/sam0x17/crystal_static_compilation
static compilation docker image: https://hub.docker.com/r/durosoft/crystal-alpine/

crystal program:

require "openssl"
puts "hey"

static compilation result:

crystal_static_compilation$ ./build_static
compiling...
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `zlib_stateful_expand_block':/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:239: undefined reference to `inflate'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `zlib_stateful_compress_block':
/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:210: undefined reference to `deflate'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `bio_zlib_free':/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:504: undefined reference to `inflateEnd'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:509: undefined reference to `deflateEnd'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `zlib_stateful_finish':
/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:187: undefined reference to `inflateEnd'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:188: undefined reference to `deflateEnd'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `zlib_stateful_init':/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:157: undefined reference to `inflateInit_'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:168: undefined reference to `deflateInit_'/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `bio_zlib_flush':/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:675: undefined reference to `deflate'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:680: undefined reference to `zError'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `bio_zlib_write':
/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:596: undefined reference to `deflateInit_'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:630: undefined reference to `deflate'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:633: undefined reference to `zError'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /usr/lib/libcrypto.a(c_zlib.o): in function `bio_zlib_read':
/home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:535: undefined reference to `inflateInit_'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:546: undefined reference to `inflate'
/usr/lib/gcc/x86_64-alpine-linux-musl/6.4.0/../../../../x86_64-alpine-linux-musl/bin/ld: /home/buildozer/aports/main/openssl1.0/src/openssl-1.0.2p/crypto/comp/c_zlib.c:549: undefined reference to `zError'
collect2: error: ld returned 1 exit status
Error: execution of command failed with code: 1: `cc "${@}" -o '/app/crystal_static_compilation'  -rdynamic -static  `command -v pkg-config > /dev/null && pkg-config --libs --silence-errors libssl || printf %s '-lssl -lcrypto'` `command -v pkg-config > /dev/null && pkg-config --libs --silence-errors libcrypto || printf %s ' -lcrypto'` /usr/lib/libpcre.a /usr/lib/libgc.a /usr/lib/libpthread.a /usr/lib/crystal/core/ext/libcrystal.a /usr/lib/libevent.a /usr/lib/librt.a -L/usr/lib -L/usr/local/lib`
done.

update: using this link flag fixes it by forcing libcrypto to be included before libz: --link-flags "-lcrypto -lz"

[sam0x17]

Why, you ask, do I need static compilation? This is for a cross platform desktop app, in anticipation of upcoming windows support.

[sam0x17]

for the lazy: this is the Dockerfile:

FROM alpine:edge
RUN apk add --update --no-cache --force-overwrite \
    openssl openssl-dev crystal shards g++ gc-dev \
    libc-dev libevent-dev libxml2-dev llvm llvm-dev \
    llvm-libs llvm-static make pcre-dev readline-dev \
    yaml-dev zlib-dev

[sam0x17]

disregard -- I forgot we already figured this out (#6288 (comment)). For some reason this issue persists unless you add the build flags: --link-flags "-lcrypto -lz" as libcrypto needs to appear before libz. Would love it if someone could make the fix in crystal so this manual override isn't required. I'll leave the issue open until this gets fixed in crystal.

TLDR:
short term fix: add this flag: --link-flags "-lcrypto -lz"

[RX14]

Duplicate of #6288