From: Mike Frysinger <vapier@gentoo.org>
To: Tsukasa OI <research_trasio@irq.a4lg.com>
Cc: Andrew Burgess <aburgess@redhat.com>, gdb-patches@sourceware.org
Subject: Re: [PATCH v3 4/5] sim: Check known getopt definition existence
Date: Sun, 23 Oct 2022 18:01:28 +0545 [thread overview]
Message-ID: <Y1UwnPuP2T1tW7lP@vapier> (raw)
In-Reply-To: <a57b2a3460064a9adc95914ba21214c8dbfc2bbf.1665038297.git.research_trasio@irq.a4lg.com>
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On 06 Oct 2022 06:43, Tsukasa OI wrote:
> Clang generates a warning if there is a function declaration/definition
> with zero arguments. Such declarations/definitions without a prototype (an
> argument list) are deprecated forms of indefinite arguments
> ("-Wdeprecated-non-prototype"). On the default configuration, it causes a
> build failure (unless "--disable-werror" is specified).
>
> include/getopt.h defines some getopt function definitions but one of them
> has a form "extern int getopt ();". If this form is selected in
> include/getopt.h, Clang generates a warning and the build fails by default.
>
> In really old environments, this getopt definition with no arguments is
> necessary (because the definition may change between environments).
> However, this definition is now a cause of problems on modern environments.
>
> A good news is, this definition is not always selected (e.g. if used by
> binutils/*.c). This is because configuration scripts of binutils, gas,
> gprof and ld tries to find known definition of getopt function is used and
> defines HAVE_DECL_GETOPT macro. If this macro is defined when getopt.h is
> included, a good form of getopt is used and Clang won't generate warnings.
>
> This commit adds a modified portion of ld/configure.ac to find the known
> getopt definition. If we could find one (and we *will* in most modern
> environments), we don't need to rely on the deprecated definition.
> ---
> sim/config.h.in | 3 +++
> sim/configure | 32 ++++++++++++++++++++++++++++++++
> sim/configure.ac | 10 ++++++++++
this logic belongs in m4/sim_ac_platform.m4, not configure.ac
should leave a comment above the code too indicating that this logic is
purely for local getopt.h usage, and is copied from other dirs (e.g. the
binutils files).
-mike
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next prev parent reply other threads:[~2022-10-23 13:30 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-13 12:57 [PATCH 0/4] sim/common: Suppress warnings if built with Clang Tsukasa OI
2022-09-13 12:57 ` [PATCH 1/4] sim: Add ATTRIBUTE_PRINTF Tsukasa OI
2022-09-13 12:57 ` [PATCH 2/4] sim: Remove self-assignments Tsukasa OI
2022-09-13 12:57 ` [PATCH 3/4] sim: Make WITH_{TRACE,PROFILE}-based macros bool Tsukasa OI
2022-10-05 11:38 ` Andrew Burgess
2022-10-06 5:33 ` Tsukasa OI
2022-09-13 12:57 ` [PATCH 4/4] sim: Suppress non-literal printf warning Tsukasa OI
2022-10-05 11:45 ` Andrew Burgess
2022-10-06 5:39 ` Tsukasa OI
2022-10-23 12:22 ` Mike Frysinger
2022-10-24 10:50 ` Tsukasa OI
2022-09-25 8:42 ` [PATCH v2 0/5] sim: Suppress warnings if built with Clang Tsukasa OI
2022-09-25 8:42 ` [PATCH v2 1/5] sim: Remove self-assignments Tsukasa OI
2022-09-25 8:42 ` [PATCH v2 2/5] sim: Make WITH_{TRACE,PROFILE}-based macros bool Tsukasa OI
2022-09-25 8:42 ` [PATCH v2 3/5] sim: Suppress non-literal printf warning Tsukasa OI
2022-09-25 8:42 ` [PATCH v2 4/5] sim: Check known getopt definition existence Tsukasa OI
2022-09-25 8:42 ` [PATCH v2 5/5] sim: Initialize pbb_br_* by default Tsukasa OI
2022-10-06 6:43 ` [PATCH v3 0/5] sim: Suppress warnings if built with Clang Tsukasa OI
2022-10-06 6:43 ` [PATCH v3 1/5] sim: Remove self-assignments Tsukasa OI
2022-10-11 14:21 ` Andrew Burgess
2022-10-11 14:29 ` Tsukasa OI
2022-10-06 6:43 ` [PATCH v3 2/5] sim: Make WITH_{TRACE,PROFILE}-based macros bool Tsukasa OI
2022-10-06 6:43 ` [PATCH v3 3/5] sim: Suppress non-literal printf warning Tsukasa OI
2022-10-11 14:22 ` Andrew Burgess
2022-10-06 6:43 ` [PATCH v3 4/5] sim: Check known getopt definition existence Tsukasa OI
2022-10-12 16:28 ` Tom de Vries
2022-10-12 17:03 ` Tsukasa OI
2022-10-12 17:08 ` Tom de Vries
2022-10-12 17:20 ` Tom de Vries
2022-10-13 9:50 ` Tsukasa OI
2022-10-23 12:16 ` Mike Frysinger [this message]
2022-10-27 2:02 ` Tsukasa OI
2023-01-03 3:12 ` Mike Frysinger
2023-01-03 8:47 ` Tsukasa OI
2022-10-06 6:43 ` [PATCH v3 5/5] sim: Initialize pbb_br_* by default Tsukasa OI
2022-10-11 14:20 ` [PATCH v3 0/5] sim: Suppress warnings if built with Clang Andrew Burgess
2022-10-11 16:40 ` Tom de Vries
2022-10-11 18:02 ` Tsukasa OI
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