Date: Thu, 3 Aug 2017 14:46:27 +0200 From: Joerg Sonnenberger <joerg@bec.de> To: Bruce Evans <brde@optusnet.com.au> Cc: Ngie Cooper <ngie@freebsd.org>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r321969 - in head/sys/boot: arm/at91/libat91 arm/ixp425/boot2 i386/boot2 Message-ID: <20170803124627.GB2734@britannica.bec.de> In-Reply-To: <20170803173421.C2203@besplex.bde.org> References: <201708030527.v735R5dg041043@repo.freebsd.org> <20170803173421.C2203@besplex.bde.org>
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On Thu, Aug 03, 2017 at 05:53:43PM +1000, Bruce Evans wrote: > Freestanding versions (static and otherwise) cause problems with builtins. > -ffreestanding turns off all builtins. The static memcpy used to be > ifdefed so as to use __builtin_memcpy instead of the static one if the > compiler is gcc. That apparently broke with gcc-4.2, since the builtin > will call libc memcpy() in some cases, although memcpy() is unavailable > in the freestanding case. GCC always had a requirement that freestanding environment must provide certain functions (memcpy, memmove, memset, memcmp). At least memcpy and memset are regulary used for certain code constructs. While most calls will be inlined, it is not required. Joerg
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