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-rw-r--r--Build/source/libs/harfbuzz/harfbuzz-src/src/gen-harfbuzzcc.py8
1 files changed, 6 insertions, 2 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/gen-harfbuzzcc.py b/Build/source/libs/harfbuzz/harfbuzz-src/src/gen-harfbuzzcc.py
index b25bcc7abb9..6801281a68c 100644
--- a/Build/source/libs/harfbuzz/harfbuzz-src/src/gen-harfbuzzcc.py
+++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/gen-harfbuzzcc.py
@@ -14,5 +14,9 @@ sources = sys.argv[3:]
with open (OUTPUT, "wb") as f:
f.write ("".join ('#include "{}"\n'.format (os.path.basename (x)) for x in sources if x.endswith (".cc")).encode ())
-# copy it also to src/
-shutil.copyfile (OUTPUT, os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT)))
+# copy it also to the source tree, but only if it has changed
+baseline_filename = os.path.join (CURRENT_SOURCE_DIR, os.path.basename (OUTPUT))
+with open(baseline_filename, "rb") as baseline:
+ with open(OUTPUT, "rb") as generated:
+ if baseline.read() != generated.read():
+ shutil.copyfile (OUTPUT, baseline_filename)