Fix "ld: symbol(s) not found" for C system calls in some MacOS versions if XCode is for a newer major MacOS version #3362
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…de is for a newer major MacOS version Citing https://www.postgrespro.ru/list/id/E1kfzRR-0001EH-Ph@gemulon.postgresql.org fixing the same problem: We previously put the -isysroot switch only into CPPFLAGS, theorizing that it was only needed to find the right copies of include files. However, it seems that we also need to use it while linking programs, to find the right stub ".tbd" files for libraries. We got away without that up to now, but apparently that was mostly luck. It may also be that failures are only observed when the Xcode version is noticeably out of sync with the host macOS version; the case that's prompting action right now is that builds fail when using latest Xcode (12.2) on macOS Catalina, even though it's fine on Big Sur. Specifically, the problem arises for `preadv' and `pwritev' (new in MacOS 11 Big Sur) when building with XCode 12.4 (supporting Big Sur) in MacOS 10.15 Catalina.
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Citing https://www.postgrespro.ru/list/id/E1kfzRR-0001EH-Ph@gemulon.postgresql.org fixing the same problem:
We previously put the -isysroot switch only into CPPFLAGS, theorizing that it was only needed to find the right copies of include files. However, it seems that we also need to use it while linking programs, to find the right stub ".tbd" files for libraries. We got away without that up to now, but apparently that was mostly luck. It may also be that failures are only observed when the Xcode version is noticeably out of sync with the host macOS version; the case that's prompting action right now is that builds fail when using latest Xcode (12.2) on macOS Catalina, even though it's fine on Big Sur.
Specifically, the problem arises for
preadv' andpwritev' (new in MacOS 11 Big Sur) when building with XCode 12.4 (supporting Big Sur) in MacOS 10.15 Catalina.Make sure you have checked all steps below.
Prerequisite
Description
see above
Tests
N/A