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The "not found" path is attempting to clear SOMELIB_CFLAGS and SOMELIB_LIBS by resetting them in AC_SUBST(). However, the second arg to AC_SUBST is expanded in autoconf with `m4_ifvaln([$2], [[$1]=$2])`, which is defined as "if the first arg is non-empty". The m4 "empty" construction is [], therefore, the existing AC_SUBST calls never modify the variables at all. The effect of this is that leftovers from the library test can leak out. At least, if a library header is found in the first stage, but the library itself is not, -lsomelib is added to SOMELIB_LIBS and further tests done. If that library is not found, SOMELIB_LIBS will not be cleared. For most of our library tests this hasn't been a problem, as they're either always found properly via pkg-config or set directly, or the calling test immediately aborts configure. For an optional dependency however, an apparent "partial" result where the header is found but no corresponding library causes link errors later. I think a complete fix should probably not be setting SOMELIB_xxx until the final result is known, but for now, adjusting the AC_SUBST calls to explictly set the empty shell string (which is not "empty" to m4) at least restores the intent. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Sponsored-by: https://despairlabs.com/sponsor/ Closes #16140 |
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.4-RELEASE.