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[PATCH] gdb: Silence -Wformat-nonliteral warning with clang
- From: Simon Marchi <simon dot marchi at efficios dot com>
- To: gdb-patches at sourceware dot org
- Cc: Simon Marchi <simon dot marchi at efficios dot com>
- Date: Fri, 11 Oct 2019 16:54:26 -0400
- Subject: [PATCH] gdb: Silence -Wformat-nonliteral warning with clang
- Dkim-filter: OpenDKIM Filter v2.10.3 mail.efficios.com 21261340169
We get this warning when building with clang:
CXX ui-out.o
/home/smarchi/src/binutils-gdb/gdb/ui-out.c:590:22: error: format string is not a string literal [-Werror,-Wformat-nonliteral]
do_message (style, format, args);
^~~~~~
This can be considered a legitimate warning, as call_do_message's format
parameter is not marked as a format string. Therefore, we should
normally mark the call_do_message method with the `format` attribute.
However, doing so just moves (and multiplies) the problem, as all the
uses of call_do_message in the vmessage method now warn. If we wanted
to continue on that path, we should silence the warning for each of
them, as a way of telling the compiler "it's ok, we know what we are
doing".
But since call_do_message is really just vmessage's little helper, it's
simpler to just silence the warning at that single point.
gdb/ChangeLog:
* ui-out.c (ui_out::call_do_message): Silence
-Wformat-nonliteral warning.
Change-Id: I58ad41793448f38835c5d6ba7b9e5c4dd8df260f
---
gdb/ui-out.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/gdb/ui-out.c b/gdb/ui-out.c
index a64c79481cad..6b0b5acd3e13 100644
--- a/gdb/ui-out.c
+++ b/gdb/ui-out.c
@@ -26,6 +26,7 @@
#include "ui-out.h"
#include "gdbsupport/format.h"
#include "cli/cli-style.h"
+#include "diagnostics.h"
#include <vector>
#include <memory>
@@ -587,7 +588,15 @@ ui_out::call_do_message (const ui_file_style &style, const char *format,
va_list args;
va_start (args, format);
+
+ /* Since call_do_message is only used as a helper of vmessage, silence the
+ warning here once instead of at all call sites in vmessage, if we were
+ to put a "format" attribute on call_do_message. */
+ DIAGNOSTIC_PUSH
+ DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
do_message (style, format, args);
+ DIAGNOSTIC_POP
+
va_end (args);
}
--
2.23.0