add script to select rust flags per target

.gitlab-ci.yml

@@ -32,7 +32,7 @@ compile:
     - git clone https://github.com/signalapp/libsignal-client
     - cd libsignal-client && git checkout "$libsignal_version"
     - rustup target add "${TARGET}"
-    - RUSTFLAGS='-C link-arg=-s' cargo build -p libsignal-jni --target "${TARGET}" --release --verbose
+    - RUSTFLAGS="$(./rustflags.sh)" cargo build -p libsignal-jni --target "${TARGET}" --release --verbose
     - cp -v target/${TARGET}/release/libsignal_jni.so ../libsignal_jni-${TARGET}.so
   artifacts:
     paths:

rustflags.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+flags="-C link-arg=-s"
+
+if [[ "${TARGET}" == *musl ]]; then 
+    flags="${flags} -C target-feature=-crt-static"
+fi
+
+echo "${flags}"