Use try..finally in compiler.targets.Target.link.

artiq/compiler/targets/__init__.py

@@ -8,7 +8,7 @@ llvm.initialize_all_asmprinters()
 class Target:
     """
     A description of the target environment where the binaries
-    generaed by the ARTIQ compiler will be deployed.
+    generated by the ARTIQ compiler will be deployed.
 
     :var triple: (string)
         LLVM target triple, e.g. ``"or1k"``
@@ -36,6 +36,7 @@ class Target:
             f.flush()
             return f
 
+        try:
             output_file = make_tempfile()
             cmdline = [self.triple + "-ld", "-shared", "--eh-frame-hdr", "-init", init_fn] + \
                       [make_tempfile(obj).name for obj in objects] + \
@@ -45,13 +46,11 @@ class Target:
             if linker.returncode != 0:
                 raise Exception("Linker invocation failed: " + stderr.decode('utf-8'))
 
-        output = output_file.read()
-
+            return output_file.read()
+        finally:
             for f in files:
                 f.close()
 
-        return output
-
     def compile(self, module):
         """Compile the module to a relocatable object for this target."""
         llmod = module.build_llvm_ir(self)