clock skew detected in archive member
Tue Jul 19 21:01:00 GMT 2016
Schwarz, Konrad <konrad.schwarz <at> siemens.com> writes:
> I am building a project in Cygwin using a GCC/binutils cross-compiler
hosted on Windows.
> i.e., make and other utilities are from Cygwin;
> gcc, ld, ar, etc. are from the cross-compiler toolchain which was compiled
natively for Windows.
> I consistently see
> make: Warning: File 'libmylib.a(myfile.o)' has modification time 3516
s in the future
> make: warning: Clock skew detected. Your build may be incomplete.
> (The exact time varies somewhat).
> The build is indeed incomplete.
> I am using the lib(member): form of rule in the Makefile, so make uses the
modification time of the member in the archive to see if it needs updating.
> As the time is close to an hour and since I am one hour east of GMT, this
might be related to a time-zone problem.
> If anyone has run across this problem and has some hints for me, I would
be most grateful.
Are you storing any of your build input or output on a network drive?
There can be problems with server<->Windows<->Cygwin conversions of file
times from some network servers.
Do builds with all files on a local drive for time stamp consistency.
Are timezone updates and settings for your Windows and Cygwin environments
current and identical e.g. Europe/Berlin or equivalent?
make -d will show you what files and times are being compared.
Run ls -l and cmd dir, and Windows and Cygwin ar -tv on the inputs and
outputs to see what both sides see for file and member timestamps.
make -B will force a complete rebuild as a workaround.
You may have to find a Windows build of make that handles archive member
file times consistently with your Windows cross-ar, and perhaps also a shell
for use by make, if build scripts do any explicit time operations.
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