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([2001:a61:244d:fe01:9fb1:d962:461a:45e8]) by smtp.gmail.com with ESMTPSA id qn4sm3372675ejb.50.2021.01.08.02.50.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 08 Jan 2021 02:50:25 -0800 (PST) Cc: mtk.manpages@gmail.com, linux-man Subject: Re: Further inconsistencies in FTM To: "Alejandro Colomar (man-pages)" References: <87f6ca4b-7f4c-20ed-cb94-3f4f88fc5077@gmail.com> From: "Michael Kerrisk (man-pages)" Message-ID: Date: Fri, 8 Jan 2021 11:50:24 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <87f6ca4b-7f4c-20ed-cb94-3f4f88fc5077@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Hi Alex, On 1/7/21 6:04 PM, Alejandro Colomar (man-pages) wrote: > Hi Michael, > > [[ > SYNOPSIS > #include > > int clearenv(void); > > Feature Test Macro Requirements for glibc (see fea‐ > ture_test_macros(7)): > > clearenv(): > /* Glibc since 2.19: */ _DEFAULT_SOURCE > || /* Glibc <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE > > ]] > > [[ > SYNOPSIS > #include > > int dysize(int year); > > Feature Test Macro Requirements for glibc (see fea‐ > ture_test_macros(7)): > > dysize(): > Since glibc 2.19: > _DEFAULT_SOURCE > Glibc 2.19 and earlier: > _BSD_SOURCE || _SVID_SOURCE > > ]] > > Which one do you prefer? Probably the latter, since it is a little easier to read. The former form has crept in as a result of my attempts to keep the FTM info somewhat compact. See, for example: chroot(): Since glibc 2.2.2: _XOPEN_SOURCE && ! (_POSIX_C_SOURCE >= 200112L) || /* Since glibc 2.20: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE Before glibc 2.2.2: none waitid(): Since glibc 2.26: _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200809L Glibc 2.25 and earlier: _XOPEN_SOURCE || /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L || /* Glibc <= 2.19: */ _BSD_SOURCE The latter could be rewritten (I hope I got the expansion right) as: waitid(): Since glibc 2.26: _XOPEN_SOURCE >= 500 || _POSIX_C_SOURCE >= 200809L Glibc 2.20 to 2.25 _XOPEN_SOURCE || _POSIX_C_SOURCE >= 200809L Glibc 2.12 to 2.19 _XOPEN_SOURCE || _POSIX_C_SOURCE >= 200809L || _BSD_SOURCE Glibc 2.11 and earlier: _XOPEN_SOURCE || _BSD_SOURCE That's more verbose, but perhaps also easier to read, now that I look at it. I'm not sure whether you are thinking of doing some global edit, but if you are, perhaps we need to discuss this more. Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/