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Rob Norris 7ac00d3c26 find_system_library: fix var cleanup when library not found 
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
 		2024-05-01 10:51:14 -07:00
..
.gitignore Prepare SPL repo to merge with ZFS repo 2018-05-29 14:51:39 -07:00
CppCheck.am cppcheck: explicitly exclude kernel code from userspace checks 2022-05-10 10:20:55 -07:00
Rules.am config: use -Wno-format-truncation globally 2024-02-26 12:23:55 -08:00
Shellcheck.am shellcheck: disable "unreachable command" check [SC2317] 2023-07-21 11:53:06 -07:00
Substfiles.am config/Substfiles.am: restrict to the dedicated list. 2024-04-09 16:34:58 -07:00
always-arch.m4 Add ARM architecture to OpenZFS buildsystem 2023-03-02 13:51:50 -08:00
always-compiler-options.m4 Fix Clang 15 compilation errors 2022-11-30 13:46:26 -08:00
always-cppcheck.m4 autoconf: use include directives instead of recursing down lib 2022-05-10 10:18:11 -07:00
always-parallel.m4 config: check for parallel(1), use it for cstyle 2022-01-06 12:46:42 -08:00
always-python.m4 Removed Python 2 and Python 3.5- support 2022-01-13 09:51:12 -07:00
always-pyzfs.m4 Python 3.12 deprecated python3-distutils 2024-04-25 13:40:09 -07:00
always-sed.m4 Add compatibility for busybox mktemp 2020-12-03 10:01:16 -08:00
always-shellcheck.m4 Turn checkbashisms into a make target 2021-06-01 11:38:54 -07:00
always-system.m4 autoconf: use include directives instead of recursing down lib 2022-05-10 10:18:11 -07:00
ax_code_coverage.m4 Updated the lz4 decompressor 2022-01-07 10:36:49 -08:00
ax_count_cpus.m4 cppcheck: integrete cppcheck 2021-01-26 16:12:26 -08:00
ax_python_devel.m4 Python 3.12 deprecated python3-distutils 2024-04-25 13:40:09 -07:00
ax_restore_flags.m4 config: better libtirpc detection 2019-03-02 16:19:05 -08:00
ax_save_flags.m4 config: better libtirpc detection 2019-03-02 16:19:05 -08:00
config.rpath Add config.rpath for AM_GNU_GETTEXT 2020-07-10 14:26:12 -07:00
deb.am Fix shebang for helper script of deb-utils 2023-01-05 10:50:00 -08:00
find_system_library.m4 find_system_library: fix var cleanup when library not found 2024-05-01 10:51:14 -07:00
gettext.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
host-cpu-c-abi.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
iconv.m4 Clarify comments in config/*.m4, vdev_geom.c, zfs_allow_*.ksh 2020-06-22 09:46:37 -07:00
intlmacosx.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
kernel-access-ok-type.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-acl.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-add-disk.m4 Fix clang 13 compilation errors 2022-06-15 14:20:28 -07:00
kernel-aio-fsync.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-automount.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-bdi.m4 Minor fix to configure on s390x 2021-05-27 22:39:53 -07:00
kernel-bio.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-bio_max_segs.m4 Linux 5.12 update: bio_max_segs() replaces BIO_MAX_PAGES 2021-03-19 22:33:42 -07:00
kernel-blk-queue.m4 zvol_os: fix compile with blk-mq on Linux 4.x 2024-04-08 11:38:49 -07:00
kernel-blkdev.m4 vdev_disk: ensure trim errors are returned immediately 2024-04-08 11:50:24 -07:00
kernel-block-device-operations.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-clear-inode.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-commit-metadata.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-config-defined.m4 autoconf: Pretend `CONFIG_MODULES` is always on 2022-04-26 10:47:09 -07:00
kernel-copy-from-user-inatomic.m4 autoconf: Fail when __copy_from_user_inatomic is a non-GPL symbol 2022-05-11 10:32:51 -07:00
kernel-cpu_has_feature.m4 Workaround for Linux PowerPC GPL-only cpu_has_feature() 2023-03-10 09:35:00 -08:00
kernel-current-time.m4 Linux 6.7 compat: simplify current_time() check 2023-12-20 11:47:18 -08:00
kernel-declare-event-class.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-dentry-alias.m4 Remove zpl_revalidate: fix snapshot rollback 2022-10-28 09:47:19 -07:00
kernel-dentry-operations.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-dirty-inode.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-discard-granularity.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-encode-fh-inode.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-evict-inode.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-fadvise.m4 Add Linux posix_fadvise support 2022-09-08 10:29:41 -07:00
kernel-fallocate.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-file-dentry.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-file-inode.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-filemap-splice-read.m4 Linux 6.5 compat: Use copy_splice_read instead of filemap_splice_read 2023-08-08 15:42:32 -07:00
kernel-filemap.m4 Linux 5.18+ compat: Detect filemap_range_has_page 2024-03-29 17:11:52 -07:00
kernel-flush_dcache_page.m4 compact: workaround for GPL-only symbols on riscv from Linux 6.2 2023-12-06 12:37:50 -08:00
kernel-fmode-t.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-follow-down-one.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-fpu.m4 Linux 6.2 compat: add check for kernel_neon_* availability 2024-01-08 16:05:24 -08:00
kernel-fst-mount.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-fsync-bdev.m4 Linux 6.6 compat: fsync_bdev() has been removed in favor of sync_blockdev() 2023-09-21 18:38:40 -07:00
kernel-fsync.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-generic_fadvise.m4 Add Linux posix_fadvise support 2022-09-08 10:29:41 -07:00
kernel-generic_fillattr.m4 Linux 6.6 compat: generic_fillattr has a new u32 request_mask added at arg2 2023-09-21 18:38:40 -07:00
kernel-generic_io_acct.m4 linux 6.3 compat: add another bdev_io_acct case 2023-03-27 11:29:19 -07:00
kernel-generic_readlink.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-genhd-flags.m4 Linux 5.17 compat: GENHD_FL_EXT_DEVT / GENHD_FL_NO_PART_SCAN 2022-04-19 10:38:04 -07:00
kernel-get-disk-ro.m4 libtpool: -Wno-clobbered 2022-02-18 09:34:25 -08:00
kernel-get-link.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-global_page_state.m4 egrep -> grep -E 2022-04-01 17:58:07 -07:00
kernel-group-info.m4 Strengthen Linux kernel capabilities detection 2022-04-21 09:37:11 -07:00
kernel-hotplug.m4 Implement memory and CPU hotplug 2020-12-10 14:09:23 -08:00
kernel-iattr-vfsid.m4 Support idmapped mount in user namespace 2022-11-08 10:28:56 -08:00
kernel-idmap_mnt_api.m4 Linux 6.8 compat: handle mnt_idmap user_namespace change 2024-01-29 11:36:07 -08:00
kernel-in-compat-syscall.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-create.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-inode-getattr.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-inode-lock.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-lookup.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-inode-permission.m4 Linux 6.8 compat: fix inode permission tests 2024-01-29 11:36:07 -08:00
kernel-inode-set-flags.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-set-iversion.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-inode-setattr.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-inode-times.m4 Linux 6.7 compat: use inode atime/mtime accessors 2023-12-20 11:47:40 -08:00
kernel-insert-inode-locked.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-is_owner_or_cap.m4 Linux 6.3 compat: idmapped mount API changes 2023-04-10 14:15:36 -07:00
kernel-kmap-atomic-args.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kmem-cache.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kmem.m4 Linux 5.16 compat: Check slab.h for kvmalloc 2022-01-24 12:57:50 -08:00
kernel-kstrtoul.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kthread.m4 Linux 5.17 compat: dequeue_signal() takes a 4th argument 2022-01-25 12:52:51 -08:00
kernel-ktime.m4 Linux 5.6 compat: ktime_get_raw_ts64() 2020-02-27 09:30:45 -08:00
kernel-kuid-helpers.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-kuidgid.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-lseek-execute.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-make-request-fn.m4 Linux 6.9 compat: blk_alloc_disk() now takes two args 2024-04-03 15:29:39 -07:00
kernel-misc-minor.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-mkdir.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-mknod.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-mm-page-size.m4 linux 5.4 compat: page_size() 2024-03-25 16:48:15 -07:00
kernel-objtool.m4 Linux 5.10 compat: frame.h renamed objtool.h 2020-11-02 22:01:10 +00:00
kernel-pagemap-folio_wait_bit.m4 autoconf: AC_MSG_CHECKING consistency 2022-06-01 09:59:37 -07:00
kernel-pde-data.m4 Linux 5.17 compat: PDE_DATA() renamed to pde_data() 2022-01-25 12:53:00 -08:00
kernel-percpu.m4 Introduce write-mostly sums 2021-05-27 14:27:29 -06:00
kernel-proc-operations.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-put-link.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-readpages.m4 autoconf: AC_MSG_CHECKING consistency 2022-06-01 09:59:37 -07:00
kernel-reclaim_state.m4 Linux 6.4 compat: reclaimed_slab renamed to reclaimed 2023-05-24 12:23:42 -07:00
kernel-register_sysctl_table.m4 Linux 6.5 compat: register_sysctl_table removed 2023-08-02 14:05:46 -07:00
kernel-rename.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-revalidate-disk-size.m4 Linux 5.18 compat: replace genhd.h with blkdev.h includes 2022-03-28 09:52:55 -07:00
kernel-rw.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-rwsem.m4 Delete rw_semaphore.wait_lock configure check 2020-12-09 21:22:54 -08:00
kernel-sched.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-security-inode-init.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-set-nlink.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-setattr-prepare.m4 Linux 6.3 compat: idmapped mount API changes 2023-04-10 14:15:36 -07:00
kernel-sget-args.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-show-options.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-shrink.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-siginfo.m4 Add SIGSTOP and SIGTSTP handling to issig 2021-04-15 13:34:35 -07:00
kernel-signal-stop.m4 Add SIGSTOP and SIGTSTP handling to issig 2021-04-15 13:34:35 -07:00
kernel-special-state.m4 Add SIGSTOP and SIGTSTP handling to issig 2021-04-15 13:34:35 -07:00
kernel-stdarg.m4 Linux 5.15 compat: standalone <linux/stdarg.h> 2021-09-08 12:59:43 -07:00
kernel-strlcpy.m4 Linux 6.8 compat: implement strlcpy fallback 2024-01-29 11:36:07 -08:00
kernel-super-userns.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-symlink.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-sysfs.m4 autoconf: AC_MSG_CHECKING consistency 2022-06-01 09:59:37 -07:00
kernel-timer.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-tmpfile.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-totalhigh_pages.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-totalram-pages-func.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-truncate-setsize.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-user-ns-inum.m4 Add Linux namespace delegation support 2022-06-10 09:51:46 -07:00
kernel-userns-capabilities.m4 Linux 4.10 compat: has_capability() 2020-07-19 09:56:21 -07:00
kernel-usleep_range.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-vfs-direct_IO.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-vfs-extended-file_range.m4 linux: implement filesystem-side copy/clone functions for EL7 2023-07-24 16:37:04 -07:00
kernel-vfs-file_range.m4 Linux 6.8 compat: use splice_copy_file_range() for fallback 2024-03-20 16:46:15 -07:00
kernel-vfs-filemap_dirty_folio.m4 autoconf: AC_MSG_CHECKING consistency 2022-06-01 09:59:37 -07:00
kernel-vfs-fsync.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel-vfs-getattr.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-vfs-iov_iter.m4 Linux 6.5 compat: replace generic_file_splice_read with filemap_splice_read 2023-08-07 15:47:46 -07:00
kernel-vfs-iterate.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-vfs-read_folio.m4 autoconf: AC_MSG_CHECKING consistency 2022-06-01 09:59:37 -07:00
kernel-vfs-rw-iterate.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-vfs-set_page_dirty.m4 autoconf: AC_MSG_CHECKING consistency 2022-06-01 09:59:37 -07:00
kernel-wait.m4 Perform KABI checks in parallel 2019-10-01 12:50:34 -07:00
kernel-writepage_t.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-xattr-handler.m4 Linux 6.8 compat: make test functions static 2024-01-29 11:36:07 -08:00
kernel-zero_page.m4 Adding ZERO_PAGE detection 2022-03-14 12:37:39 -07:00
kernel-zlib.m4 Linux compat: Minimum kernel version 3.10 2019-11-12 08:59:06 -08:00
kernel.m4 linux 5.4 compat: page_size() 2024-03-25 16:48:15 -07:00
lib-ld.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
lib-link.m4 Clarify comments in config/*.m4, vdev_geom.c, zfs_allow_*.ksh 2020-06-22 09:46:37 -07:00
lib-prefix.m4 Clarify comments in config/*.m4, vdev_geom.c, zfs_allow_*.ksh 2020-06-22 09:46:37 -07:00
mount-helper.m4 Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
nls.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
pkg.m4 Fix typos in config/ 2019-08-30 09:40:30 -07:00
po.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
progtest.m4 config: libintl/libiconv for gettext() detection 2019-04-19 12:09:29 -07:00
rpm.am Make sure all necessary RPM path macros are defined 2024-01-16 13:32:59 -08:00
tgz.am Make RPM_DEFINE_KMOD conditional on CONFIG_KERNEL 2020-07-14 17:32:21 -07:00
toolchain-simd.m4 Linux 5.16 compat: don't use XSTATE_XSAVE to save FPU state 2022-02-09 12:50:10 -08:00
user-aio.h.m4 config: user: check for <aio.h> 2022-03-28 10:24:22 -07:00
user-clock_gettime.m4 Clean up lib dependencies 2020-07-10 14:26:00 -07:00
user-dracut.m4 Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
user-gettext.m4 Add config.rpath for AM_GNU_GETTEXT 2020-07-10 14:26:12 -07:00
user-libaio.m4 config: user: check for <aio.h> 2022-03-28 10:24:22 -07:00
user-libatomic.m4 config/libatomic: require -latomic iff atomic.c doesn't link w/o it 2021-07-13 13:50:48 -07:00
user-libblkid.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libcrypto.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libexec.m4 Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
user-libfetch.m4 libfetch: unquote @LIBFETCH_SONAME@ subst 2022-01-06 11:26:40 -08:00
user-libtirpc.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libudev.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-libuuid.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user-makedev.m4 Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
user-pam.m4 Use correct prefix for share/pam-configs 2020-07-30 09:09:46 -07:00
user-runstatedir.m4 Add defs for makefile installation dir vars 2014-03-31 16:11:13 -07:00
user-systemd.m4 autoconf: use include directives instead of recursing down etc 2022-05-10 10:19:58 -07:00
user-sysvinit.m4 autoconf: use include directives instead of recursing down etc 2022-05-10 10:19:58 -07:00
user-udev.m4 Autoconf 2.70 compatibility 2021-01-02 16:55:55 -08:00
user-zlib.m4 Fix up FIND_SYSTEM_LIBRARY to work with cross-compiling 2020-07-10 14:26:40 -07:00
user.m4 Only provide execvpe(3) when needed 2023-11-30 16:04:18 -08:00
zfs-build.m4 etc/init.d: decide which variant to use at build time. 2024-04-08 16:52:24 -07:00
zfs-meta.m4 Remove basename(1). Clean up/shorten some coreutils pipelines 2021-11-11 13:27:37 -07:00