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dnl
dnl backtrace(), for userspace assertions. glibc has this directly in libc.
dnl FreeBSD and (sometimes) musl have it in a separate -lexecinfo. It's assumed
dnl that this will also get the companion function backtrace_symbols().
dnl
AC_DEFUN([ZFS_AC_CONFIG_USER_BACKTRACE], [
AX_SAVE_FLAGS
LIBS=""
AC_SEARCH_LIBS([backtrace], [execinfo], [
AC_DEFINE(HAVE_BACKTRACE, 1, [backtrace() is available])
AC_SUBST([BACKTRACE_LIBS], ["$LIBS"])
])
AX_RESTORE_FLAGS
])
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