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046f081b46
Adding _POSIX_C_SOURCE to CPPFLAGS globally produces all sorts of problems since it causes certain system functions to be hidden on some (BSD) systems. The solution is to only add the flag on systems that really require it, i.e. glibc-based ones. This change makes BSD systems compile out-of-the-box without the need for adding specific flags manually. It also allows dropping a number of flags set manually on a file-per-file basis, but were only present to work around breakage introduced by the presence of _POSIX_C_SOURCE. Also add _XOPEN_SOURCE to CPPFLAGS for glibc systems. We use XSI extensions in several places already, so it is preferable to define it globally instead of littering source files with individual #defines only needed for glibc.
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifdef __APPLE__
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#include <sys/sysctl.h>
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#elif defined(__OpenBSD__)
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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#elif defined(__AMIGAOS4__)
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#include <exec/exec.h>
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#include <interfaces/exec.h>
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#include <proto/exec.h>
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#endif /* __APPLE__ */
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#include "libavutil/cpu.h"
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#include "config.h"
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/**
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* This function MAY rely on signal() or fork() in order to make sure AltiVec
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* is present.
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*/
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int ff_get_cpu_flags_ppc(void)
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{
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#if HAVE_ALTIVEC
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#ifdef __AMIGAOS4__
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ULONG result = 0;
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extern struct ExecIFace *IExec;
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IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
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if (result == VECTORTYPE_ALTIVEC)
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return AV_CPU_FLAG_ALTIVEC;
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return 0;
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#elif defined(__APPLE__) || defined(__OpenBSD__)
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#ifdef __OpenBSD__
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int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
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#else
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int sels[2] = {CTL_HW, HW_VECTORUNIT};
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#endif
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int has_vu = 0;
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size_t len = sizeof(has_vu);
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int err;
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err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
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if (err == 0)
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return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
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return 0;
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#elif CONFIG_RUNTIME_CPUDETECT
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int proc_ver;
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// Support of mfspr PVR emulation added in Linux 2.6.17.
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__asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
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proc_ver >>= 16;
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if (proc_ver & 0x8000 ||
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proc_ver == 0x000c ||
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proc_ver == 0x0039 || proc_ver == 0x003c ||
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proc_ver == 0x0044 || proc_ver == 0x0045 ||
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proc_ver == 0x0070)
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return AV_CPU_FLAG_ALTIVEC;
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return 0;
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#else
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// Since we were compiled for AltiVec, just assume we have it
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// until someone comes up with a proper way (not involving signal hacks).
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return AV_CPU_FLAG_ALTIVEC;
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#endif /* __AMIGAOS4__ */
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#endif /* HAVE_ALTIVEC */
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return 0;
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}
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