[binutils-gdb] Fix clang build

[Tom Tromey <tromey@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=13ed3225004896142dcb0fbe24411b66f17dfc8e

commit 13ed3225004896142dcb0fbe24411b66f17dfc8e
Author: Tom Tromey <tromey@adacore.com>
Date:   Wed Mar 27 07:21:56 2024 -0600

    Fix clang build
    
    Simon pointed out that commit 818ef5f4 ("Capture warnings when writing
    to the index cache") broke the build with clang.  This patch fixes the
    breakage.

Diff:
---
 gdb/utils.h | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/gdb/utils.h b/gdb/utils.h
index d7db1d84e2f..875a2583179 100644
--- a/gdb/utils.h
+++ b/gdb/utils.h
@@ -444,10 +444,18 @@ struct deferred_warnings
      hook; see scoped_restore_warning_hook.  Note that no locking is
      done, so users have to be careful to only install this into a
      single thread at a time.  */
-  void operator() (const char *format, va_list args) ATTRIBUTE_PRINTF (2, 0)
+  void operator() (const char *format, va_list args)
   {
     string_file msg (m_can_style);
+    /* Clang warns if we add ATTRIBUTE_PRINTF to this method (because
+       the function-view wrapper doesn't also have the attribute), but
+       then warns again if we remove it, because this vprintf call
+       does not use a literal format string.  So, suppress the
+       warnings here.  */
+    DIAGNOSTIC_PUSH
+    DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
     msg.vprintf (format, args);
+    DIAGNOSTIC_POP
     m_warnings.emplace_back (std::move (msg));
   }