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build: don't clobber rust depfile mtime when fixing its paths

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This avoids ninja unnecessarily rebuilding rust targets.
Add a check for problems like these to be run on appveyor.
This commit is contained in:
Bert Belder 2018-08-17 22:42:26 +02:00
parent 42e7b7b3e7
commit 3640ea4c0d
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2 changed files with 15 additions and 1 deletions
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4
tools/run_rustc.py
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@ -14,6 +14,9 @@ import util
# Updates the path of the main target in the depfile to the relative path
# from base_path build_output_path
def fix_depfile(depfile_path, base_path, build_output_path):
# It's important that the fixed-up depfile has the same mtime as before.
# Ninja relies on it to decide whether to rebuild the target it belongs to.
stat = os.stat(depfile_path)
with open(depfile_path, "r") as depfile:
content = depfile.read()
content_split = content.split(': ', 1)
@ -21,6 +24,7 @@ def fix_depfile(depfile_path, base_path, build_output_path):
new_content = "%s: %s" % (target_path, content_split[1])
with open(depfile_path, "w") as depfile:
depfile.write(new_content)
os.utime(depfile_path, (stat.st_atime, stat.st_mtime))
def main():