build: more Libdl.dlext

deps/build.jl

@@ -139,7 +139,7 @@ if !libmxnet_detected
   _libdir = joinpath(_prefix, "lib")
   # We have do eagerly delete the installed libmxnet.so
   # Otherwise we won't rebuild on an update.
-  run(`rm -f $_libdir/libmxnet.so`)
+  run(`rm -f $_libdir/libmxnet.$(Libdl.dlext)`)
   provides(BuildProcess,
     (@build_steps begin
       CreateDirectory(_srcdir)
@@ -183,8 +183,10 @@ if !libmxnet_detected
             `make -j$(get_cpucore())`
           end
         end
-        FileRule(joinpath(_libdir, "libmxnet.so"), @build_steps begin
-          `cp $_mxdir/lib/libmxnet.so $_libdir/`
+        FileRule(joinpath(_libdir, "libmxnet.$(Libdl.dlext)"), @build_steps begin
+          # the output file on macos is still in `.so` suffix
+          # so we rename it
+          `cp $_mxdir/lib/libmxnet.so $_libdir/libmxnet.$(Libdl.dlext)`
         end)
       end
     end), mxnet, installed_libpath=_libdir)

src/base.jl

@@ -23,7 +23,7 @@ if isempty(MXNET_LIB)
   # touch this file, so that after the user properly build libmxnet, the precompiled
   # MXNet.ji will be re-compiled to get MXNET_LIB properly.
   touch(@__FILE__)
-  error("Cannot find or load libmxnet.$(Libdl.dlext)." *
+  error("Cannot find or load libmxnet.$(Libdl.dlext). " *
         "Please see the document on how to build it.")
 else
   include_dependency(MXNET_LIB)