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From: Enze Li <enze.li@hotmail.com>
To: Nick Clifton <nickc@redhat.com>
Cc: Tsukasa OI <research_trasio@irq.a4lg.com>,
	 Pedro Alves <pedro@palves.net>,
	 Joel Brobecker <brobecker@adacore.com>,
	 Enze Li <lienze@sourceware.org>,
	 binutils@sourceware.org, gdb-patches@sourceware.org
Subject: Re: [PATCH 1/4] include: Add macro to ignore -Wuser-defined-warnings
Date: Thu, 22 Sep 2022 21:02:16 +0800	[thread overview]
Message-ID: <OS3P286MB2152712090CCDAAD09DFFD45F04E9@OS3P286MB2152.JPNP286.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <5333c388-9fc9-1a45-01da-835ad81541cc@redhat.com> (Nick Clifton's message of "Tue, 20 Sep 2022 17:36:05 +0100")

Hi Nick,

On Tue, Sep 20 2022 at 05:36:05 PM +0100, Nick Clifton wrote:

> Hi Tsukasa,
>
>> +# if __has_warning ("-Wuser-defined-warnings")
>
> I have not seen __has_warning () before.  Is this a new feature of
> recent GCCs and Clang, or am I just behind the times ?
>
> Cheers
>   Nick

I happen to know some info about this function-like macro.  It was first
introduced in 2011.  AFAIK, it is only supported by clang.
More detail, see here[1] for docs and here[2] for implement.

[1] https://clang.llvm.org/docs/LanguageExtensions.html#has-warning
[2] https://github.com/llvm/llvm-project/commit/a35d67dfd927191a16cf24931981d79901938381

Thanks,
Enze

  parent reply	other threads:[~2022-09-22 13:02 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-15  3:10 [PATCH 0/4] gdb: (includes PR28413), Suppress some general warnings if built with Clang Tsukasa OI
2022-09-15  3:10 ` [PATCH 1/4] include: Add macro to ignore -Wuser-defined-warnings Tsukasa OI
2022-09-20 16:36   ` Nick Clifton
2022-09-21  6:13     ` Tsukasa OI
2022-09-22 13:02     ` Enze Li [this message]
2022-09-15  3:10 ` [PATCH 2/4] include: Add macro to ignore -Wunused-but-set-variable Tsukasa OI
2022-09-15  3:10 ` [PATCH 3/4] gdb/unittests: PR28413, suppress warnings generated by Gnulib Tsukasa OI
2022-09-15  3:10 ` [PATCH 4/4] gdb: Suppress "unused" variable warning on Clang Tsukasa OI
2022-09-22  8:25 ` [PATCH v2 0/4] gdb: (includes PR28413), Suppress some general warnings if built with Clang Tsukasa OI
2022-09-22  8:25   ` [PATCH v2 1/4] include: Add macro to ignore -Wuser-defined-warnings Tsukasa OI
2022-09-22 11:26     ` Nick Clifton
2022-09-22  8:25   ` [PATCH v2 2/4] include: Add macro to ignore -Wunused-but-set-variable Tsukasa OI
2022-09-22 11:27     ` Nick Clifton
2022-09-22  8:25   ` [PATCH v2 3/4] gdb/unittests: PR28413, suppress warnings generated by Gnulib Tsukasa OI
2022-10-18 13:44     ` Enze Li
2022-09-22  8:25   ` [PATCH v2 4/4] gdb: Suppress "unused" variable warning on Clang Tsukasa OI
2022-10-12 17:36     ` Simon Marchi

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