Date: Sat, 17 Dec 2016 11:46:30 +0000 From: David Chisnall <theraven@FreeBSD.org> To: Baptiste Daroussin <bapt@FreeBSD.org> Cc: "Conrad E. Meyer" <cem@FreeBSD.org>, src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r310138 - head/lib/libc/stdio Message-ID: <00BFA847-B26A-453A-87DB-D5A55C1FAA38@FreeBSD.org> In-Reply-To: <20161216193128.wgskqt4vc44vdd7o@ivaldir.etoilebsd.net> References: <201612160144.uBG1ipjW016736@repo.freebsd.org> <20161216193128.wgskqt4vc44vdd7o@ivaldir.etoilebsd.net>
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--Apple-Mail=_C0CEB0C7-8681-4829-B0BD-DAFD52087B5C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 On 16 Dec 2016, at 19:31, Baptiste Daroussin <bapt@FreeBSD.org> wrote: >=20 > Other than that, it makes more difficult to use vanilla gcc with out = userland. > and it is adding more complexity to be able to build freebsd from a = non freebsd > system which some people are working on. Why? You=E2=80=99ll get some spurious warnings about printf, but = that=E2=80=99s all. Our printf (like the glibc one) already supports = user-defined extensions via register_printf_function (for which, I note, = we don=E2=80=99t have a man page), so third-party code also has some of = these warnings if they=E2=80=99ve registered other printf handlers. I=E2=80=99d actually consider that to be the biggest argument against = adding %b support: we support users adding their own interpretation of = %b via register_printf_function and this will break anyone third-party = code where people do this. This commit is doubly bad, because not only = does it change our ABI, it doesn=E2=80=99t document the fact. The code in this commit is also simply broken. It does not add a = corresponding handler in xprintf.c, so as soon as someone calls = register_printf_function with *any* argument, printf=E2=80=99s ability = to handle %b will be broken in a difficult-to-debug way. David --Apple-Mail=_C0CEB0C7-8681-4829-B0BD-DAFD52087B5C Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIK5jCCBPww ggPkoAMCAQICECJrrb9nBol9MHok/UZg/AYwDQYJKoZIhvcNAQELBQAwdTELMAkGA1UEBhMCSUwx FjAUBgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKTAnBgNVBAsTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24g QXV0aG9yaXR5MSMwIQYDVQQDExpTdGFydENvbSBDbGFzcyAxIENsaWVudCBDQTAeFw0xNjA0MTkw OTI3NDJaFw0xNzA0MTkwOTI3NDJaMEQxHTAbBgNVBAMMFHRoZXJhdmVuQGZyZWVic2Qub3JnMSMw IQYJKoZIhvcNAQkBFhR0aGVyYXZlbkBmcmVlYnNkLm9yZzCCASIwDQYJKoZIhvcNAQEBBQADggEP ADCCAQoCggEBALsL5pEhrGjrswHVdMHWhgxb8ARKDYRePSqpDLmjJ40bpx+n1zrvIwjC2Vk2IpoD 04rg5Pog2IrhnX+Qk2NSXzBXWj2JAaTc9OtSeAY0BtgJYXONGONQbRKVy97QBdzd1SbMEzDrOgH5 UDI+5sF1PboOTmLyTAPI9273XdfZ0BnstUXs8NXr/7p9E5CWJOsO1iQcINbm4XiwC1PLNMeWUknE Nji/hFKwcE8IFtaUe1ymbw6yA3rBpDu3KewIRD1T66FPTZJeIzvUoBIqWd+GAOfCBG2QYmbc3y/x 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