[PATCH] wscript: Deduplicate installed files

[Kinsey Moore]

The addition of the NAND and NOR drivers both depending on the Xilinx
support code independently has introduced the possibility of duplicate
installed headers. This duplication results in multiple header install
attempts which can conflict since the installs can run on multiple CPUs.
This change to wscript deduplicates the header installs individually as
necessary. This change ignores identical installs and throws an error on
different header installs to the same location.
---
 wscript | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/wscript b/wscript
index a34cac51e2..385ba8eb1c 100755
--- a/wscript
+++ b/wscript
@@ -269,8 +269,39 @@ class Item(object):
             bld.install_files(install_path, self.get(bld, "target"))
 
     def install_files(self, bld):
+        if "rtems_installed" not in bld.env:
+            bld.env["rtems_installed"] = {}
+
         for install in self.data["install"]:
-            bld.install_files(install["destination"], install["source"])
+            # setup destination array if it doesn't exist
+            dest = install["destination"]
+            if dest not in bld.env.rtems_installed:
+                bld.env["rtems_installed"][dest] = []
+
+            # build deduplicated install set
+            dedup_set = []
+
+            for item in install["source"]:
+                # search for duplicate installs
+                match_found = False
+                filename = os.path.basename(item)
+
+                for existing in bld.env["rtems_installed"][dest]:
+                    if existing[0] == filename:
+                        # duplicate found
+                        if item != existing[1]:
+                            bld.fatal(("File installs {} and {} " +
+                                "target the same location").format(
+                                    item, existing[1]))
+                        match_found = True
+                        break
+
+                if not match_found:
+                    dedup_set.append(item)
+                    bld.env["rtems_installed"][dest].append([filename, item])
+
+            if len(dedup_set):
+                bld.install_files(dest, dedup_set)
 
     def asm(self, bld, bic, source, target=None):
         if target is None:
-- 
2.30.2