[PATCH] scripts/nsis.py: Run dependency check for each DLL file only once

[Stefan Weil]

Each DLL should only be checked once for dependencies, but
several hundred (781 in my test) unneeded checks were done.

Now the script is significantly faster (16 s in my build).

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 scripts/nsis.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/scripts/nsis.py b/scripts/nsis.py
index d0914c88a7..d0ac61f6ab 100644
--- a/scripts/nsis.py
+++ b/scripts/nsis.py
@@ -37,10 +37,10 @@ def find_deps(exe_or_dll, search_path, analyzed_deps):
 
         analyzed_deps.add(dep)
         # locate the dll dependencies recursively
-        rdeps = find_deps(dll, search_path, analyzed_deps)
+        analyzed_deps, rdeps = find_deps(dll, search_path, analyzed_deps)
         deps.extend(rdeps)
 
-    return deps
+    return analyzed_deps, deps
 
 def main():
     parser = argparse.ArgumentParser(description="QEMU NSIS build helper.")
@@ -92,18 +92,18 @@ def main():
         dlldir = os.path.join(destdir + prefix, "dll")
         os.mkdir(dlldir)
 
+        analyzed_deps = set()
         for exe in glob.glob(os.path.join(destdir + prefix, "*.exe")):
             signcode(exe)
 
             # find all dll dependencies
-            deps = set(find_deps(exe, search_path, set()))
+            analyzed_deps, deps = find_deps(exe, search_path, analyzed_deps)
+            deps = set(deps)
             deps.remove(exe)
 
             # copy all dlls to the DLLDIR
             for dep in deps:
                 dllfile = os.path.join(dlldir, os.path.basename(dep))
-                if (os.path.exists(dllfile)):
-                    continue
                 print("Copying '%s' to '%s'" % (dep, dllfile))
                 shutil.copy(dep, dllfile)
 
-- 
2.45.2