build: add shell wrapper for cc

.travis.yml

@@ -6,31 +6,20 @@ rust:
   - nightly
   - stable
 
-cache:
-  directories:
-    - target
-
 os:
   - linux
 #  - osx
 
 git:
   submodules: true
 
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-      - sourceline: "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic main"
-        key_url: "https://apt.llvm.org/llvm-snapshot.gpg.key"
-    packages:
-      - lld
-
 script:
   - travis_wait cargo build --features static-link --verbose
-  - travis_wait cargo test --tests --features static-link --no-fail-fast -- --test-threads 1
+  - travis_wait cargo build --features static-link --verbose
+  - RUSTFLAGS="-C linker=${PWD}/scripts/cc" travis_wait cargo test --tests --features static-link --no-fail-fast
 
 env:
   global:
-    - LD_LIBRARY_PATH=/usr/local/lib
-    - RUSTFLAGS="-C link-arg=-fuse-ld=lld"
+    - RUST_TEST_THREADS=1
+    # use shell wrapper for cc to fix link error
+    # - RUSTFLAGS="-C link-arg=-fuse-ld=lld"

scripts/cc

@@ -0,0 +1,22 @@
+#!/bin/bash -e
+
+# This script handles circular reference link between librocks and librocks_sys,
+# by modifying the link order:
+# librocks librocks_sys => librocks librocks_sys librocks
+
+SYSTEM_CC="/usr/bin/cc"
+
+ARGS=("$@")
+
+FIXED_ARGS=()
+
+for arg in "${ARGS[@]}"; do
+    FIXED_ARGS+=($arg)
+    if [[ $arg == *librocks-*.rlib ]]; then
+        _librocks=$arg
+    elif [[ $arg == *librocks_sys-*.rlib ]]; then
+        FIXED_ARGS+=($_librocks)
+    fi
+done
+
+exec ${SYSTEM_CC} ${FIXED_ARGS[@]}