samples, concurrent: Download dependencies before building

samples/concurrent/build.gradle

@@ -14,7 +14,6 @@ konanArtifacts {
 }
 
 task compileCpp(type: Exec) {
-    dependsOn 'genMessageChannelInteropStubs'
     workingDir project.getProjectDir()
     commandLine './buildCpp.sh'
 }

samples/concurrent/build.sh

@@ -24,7 +24,7 @@ $DIR/buildCpp.sh
 cinterop -def $DIR/src/main/c_interop/MessageChannel.def -copt "-I$DIR/src/main/cpp" -target $TARGET \
 	 -o $DIR/build/c_interop/MessageChannel || exit 1
 
-konanc $DIR/src/main/kotlin/Concurrent.kt -library $DIR/build/c_interop/MessageChannel \
+konanc $DIR/src/main/kotlin/Concurrent.kt -target $TARGET -library $DIR/build/c_interop/MessageChannel \
        -nativelibrary $DIR/build/clang/MessageChannel.bc -o $DIR/build/bin/Concurrent || exit 1
 
 echo "Artifact path is $DIR/build/bin/Concurrent.kexe"

samples/concurrent/buildCpp.sh

@@ -12,6 +12,9 @@ case "$OSTYPE" in
 esac
 fi
 
+# Ensure that C compiler for the target is available.
+konanc --check_dependencies -target $TARGET || exit 1
+
 CLANG_linux=$DEPS/clang-llvm-3.9.0-linux-x86-64/bin/clang++
 CLANG_macbook=$DEPS/clang-llvm-3.9.0-darwin-macos/bin/clang++