diff options
Diffstat (limited to 'sys/contrib/openzfs/config/user-libunwind.m4')
| -rw-r--r-- | sys/contrib/openzfs/config/user-libunwind.m4 | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/config/user-libunwind.m4 b/sys/contrib/openzfs/config/user-libunwind.m4 new file mode 100644 index 000000000000..99ba3dcf452d --- /dev/null +++ b/sys/contrib/openzfs/config/user-libunwind.m4 @@ -0,0 +1,44 @@ +dnl +dnl Checks for libunwind, which usually does a better job than backtrace() when +dnl resolving symbols in the stack backtrace. Newer versions have support for +dnl getting info about the object file the function came from, so we look for +dnl that too and use it if found. +dnl +AC_DEFUN([ZFS_AC_CONFIG_USER_LIBUNWIND], [ + AC_ARG_WITH([libunwind], + AS_HELP_STRING([--with-libunwind], + [use libunwind for backtraces in userspace assertions]), + [], + [with_libunwind=auto]) + + AS_IF([test "x$with_libunwind" != "xno"], [ + ZFS_AC_FIND_SYSTEM_LIBRARY(LIBUNWIND, [libunwind], [libunwind.h], [], [unwind], [], [ + dnl unw_get_elf_filename() is sometimes a macro, other + dnl times a proper symbol, so we can't just do a link + dnl check; we need to include the header properly. + AX_SAVE_FLAGS + CFLAGS="$CFLAGS $LIBUNWIND_CFLAGS" + LIBS="$LIBS $LIBUNWIND_LIBS" + AC_MSG_CHECKING([for unw_get_elf_filename in libunwind]) + AC_LINK_IFELSE([ + AC_LANG_PROGRAM([ + #define UNW_LOCAL_ONLY + #include <libunwind.h> + ], [ + unw_get_elf_filename(0, 0, 0, 0); + ]) + ], [ + AC_MSG_RESULT([yes]) + AC_DEFINE(HAVE_LIBUNWIND_ELF, 1, + [libunwind has unw_get_elf_filename]) + ], [ + AC_MSG_RESULT([no]) + ]) + AX_RESTORE_FLAGS + ], [ + AS_IF([test "x$with_libunwind" = "xyes"], [ + AC_MSG_FAILURE([--with-libunwind was given, but libunwind is not available, try installing libunwind-devel]) + ]) + ]) + ]) +]) |