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Are the binaries from more recent versions of cctools available somewhere on the internet to download? With the command line tools from Xcode 12, install_name_tool -id stores the current timestamp (to 1 second resolution) in the file even when I have exported ZERO_AR_DATE=1. However, when I download cctools-973 - https://opensource.apple.com/release/developer-tools-120.html, and build my own version of install_name_tool without any modifications, then the new binary does not have this behavior. On looking at the source code all the way up to cctools-410, I notice comments (see comments for line #undef OUTPUT_OPTION in this file) - https://opensource.apple.com/source/cctools/cctools-410.1/misc/install_name_tool.c.auto.html hinting that this behavior was fixed at some point. Given that install_name_tool does not have version information, it is hard to say which version of cctools is currently shipping with Xcode. To reproduce the behavior I mentioned above that is observed with cctools from Xcode CLT, but not with the open source versions: $ cat foo.c void a() {} $ clang -g -c foo.c -o foo.o $ clang -dynamiclib -o foo.so foo.o $ shasum foo.so $ for attempt in {1..4}; do sleep 1 && install_name_tool -id "foo.so" foo.so && shasum foo.so; done