[PATCH] Mips: Enable asynchronous unwind tables with both ASAN and LSAN

[Dimitrije Milosevic <Dimitrije.Milosevic@Syrmia.com>]

Enable asynchronous unwind tables with both ASAN and TSAN for correct back-trace.
LLVM currently enables asynchronous unwind tables for: ASAN, HWSAN, TSAN, MSAN, and DFSAN.
HWSAN is currently available only on AArch64, while MSAN and DFSAN are not available at all.
Also, LLVM checks is '-ffreestanding' is not passed in. '-ffreestanding' is only available in C-family frontends, hence why no such check is included.
TODO: Not sure if any tests should be added.

gcc/ChangeLog:

        * config/mips/mips.cc (mips_option_override): Enable
        asyncronous unwind tables with both ASAN and TSAN.

---
 gcc/config/mips/mips.cc | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc
index e64928f4113..ea2a038216c 100644
--- a/gcc/config/mips/mips.cc
+++ b/gcc/config/mips/mips.cc
@@ -20115,10 +20115,15 @@ mips_option_override (void)
  target_flags |= MASK_64BIT;
     }

-  /* -fsanitize=address needs to turn on -fasynchronous-unwind-tables in
-     order for tracebacks to be complete but not if any
-     -fasynchronous-unwind-table were already specified.  */
-  if (flag_sanitize & SANITIZE_USER_ADDRESS
+  /* -fsanitize=address, and -fsanitize=thread need to turn
+     on -fasynchronous-unwind-tables in order for tracebacks
+     to be complete but not if any -fasynchronous-unwind-table
+     were already specified.  */
+  /* FIXME: HWSAN is currently only available on AArch64,
+      but could also utilize -fasynchronous-unwind-tables.
+     FIXME: We would also like to check if -ffreestanding is passed in.
+      However, it is only available in C-ish frontends.  */
+  if (flag_sanitize & (SANITIZE_USER_ADDRESS | SANITIZE_THREAD)
       && !global_options_set.x_flag_asynchronous_unwind_tables)
     flag_asynchronous_unwind_tables = 1;

---