[Bug gdb/31262] [gdb] ThreadSanitizer: data raceindex-cache.c:76 in index_cache::enable()

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31262

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
I guess the problem is that we're capturing index_cache_store_context in a
worker thread (T5) while the capturing is supposed to happen in the main
thread:
...
/* Information to be captured in the main thread, and to be used by worker      
   threads during store ().  */

struct index_cache_store_context
{
  friend class index_cache;

  index_cache_store_context (const index_cache &ic, dwarf2_per_bfd *per_bfd);
...

In other words, this should trigger:
...
diff --git a/gdb/dwarf2/index-cache.c b/gdb/dwarf2/index-cache.c
index 7ddd7b3f974..50db5f92b40 100644
--- a/gdb/dwarf2/index-cache.c
+++ b/gdb/dwarf2/index-cache.c
@@ -92,6 +92,7 @@ index_cache_store_context::index_cache_store_context (const
index_cache &ic,
                                                      dwarf2_per_bfd *per_bfd)
   :  m_enabled (ic.enabled ())
 {
+  gdb_assert (is_main_thread ());
   if (!m_enabled)
     return;

...

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