Date: Sat, 5 Jul 2014 13:49:44 +0100 From: David Chisnall <theraven@theravensnest.org> To: David Wolfskill <david@catwhisker.org> Cc: Hans Petter Selasky <hps@selasky.org>, stable@freebsd.org, "current@freebsd.org" <current@freebsd.org> Subject: Re: [HEADS-UP] Problem with clang in 9-stable [was: r268244 (stable/9) seems to break "sysctl hw.ncpu"] Message-ID: <909248A4-1B7C-4836-ADAA-F81A70A8AC3C@theravensnest.org> In-Reply-To: <20140704181831.GV6056@albert.catwhisker.org> References: <20140704123901.GR6056@albert.catwhisker.org> <53B6E218.5070009@selasky.org> <20140704174705.GS6056@albert.catwhisker.org> <53B6EDD1.8030506@selasky.org> <20140704181831.GV6056@albert.catwhisker.org>
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On 4 Jul 2014, at 19:18, David Wolfskill <david@catwhisker.org> wrote: > clang -O2 -pipe -std=3Dgnu99 -Qunused-arguments -fstack-protector = -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter = -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith = -Wno-uninitialized -Wno-pointer-sign -Wno-empty-body = -Wno-string-plus-int -Wno-unused-const-variable = -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality = -Wno-unused-function -Wno-enum-conversion -o sysctl sysctl.o=20 This compile line is turning off a lot of warnings. In particular, = -Wno-uninitialized and -Wno-parentheses-equality are likely to hide = warnings that refer to real errors. It sounds like this case was one of = them - if these warnings were on then we'd have got a build failure = rather than an executable that depended on undefined behaviour. David
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