Merge pull request aldanor#29 from magnusuMET/bugfix/external_linkage

Use extern crate to force linkage

Author: magnusuMET

hdf5-src/src/lib.rs

@@ -1 +1,4 @@
 //! Dummy crate for building HDF5 C library from source.
+
+#[cfg(feature = "zlib")]
+extern crate libz_sys;

hdf5-sys/Cargo.toml

@@ -27,7 +27,7 @@ default = []
 mpio = ["dep:mpi-sys"]
 hl = ["hdf5-src?/hl"]
 threadsafe = ["hdf5-src?/threadsafe"]
-zlib = ["libz-sys", "hdf5-src?/zlib"]
+zlib = ["dep:libz-sys", "hdf5-src?/zlib"]
 static = ["dep:hdf5-src"]
 deprecated = ["hdf5-src?/deprecated"]
 

hdf5-sys/build.rs

@@ -734,9 +734,6 @@ fn get_build_and_emit() {
     if feature_enabled("ZLIB") {
         let zlib_lib = env::var("DEP_HDF5SRC_ZLIB").unwrap();
         println!("cargo::metadata=zlib={}", &zlib_lib);
-        let zlib_lib_header = env::var("DEP_HDF5SRC_ZLIB").unwrap();
-        println!("cargo::metadata=zlib={}", &zlib_lib_header);
-        println!("cargo::rustc-link-lib=static={}", &zlib_lib);
     }
 
     if feature_enabled("HL") {

hdf5-sys/src/lib.rs

@@ -8,6 +8,13 @@
 #![allow(clippy::module_name_repetitions)]
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
+#[cfg(feature = "static")]
+extern crate hdf5_src;
+#[cfg(feature = "zlib")]
+extern crate libz_sys;
+#[cfg(feature = "mpio")]
+extern crate mpi_sys;
+
 macro_rules! extern_static {
     ($dest:ident, $src:ident) => {
         extern "C" {