ffmpeg configure配置选项
-
- 帮助选项Help options
- 标准选项Standard options
- 许可证选项Licensing options
- 配置选项Configuration options
- 程序选项Program options
- 文档选项Documentation options
- 组件选项Component options
- 个别组件选项Individual component options
- 扩展库支持External library support
- 硬件加速功能hardware acceleration features
- 工具链选项Toolchain options
- 高级选项Advanced options
- 优化选项Optimization options
- 开发者选项Developer options
帮助选项（Help options）
用于查看ffmpeg的能力
| 选项 | 说明 |
|---|---|
| –help | print this message |
| –list-decoders | 显示所有可用的解码器（h264/mjpeg等） |
| –list-encoders | 显示所有可用的编码器（h264/mjpeg等） |
| –list-hwaccels | 显示所有支持的硬编解码器（h264_videotoolbox/h264_mediacodec等） |
| –list-demuxers | 显示所有支持解复用的容器（mp4/h264等） |
| –list-muxers | 显示所有支持复用的容器（mp4/h264等） |
| –list-parsers | show all available parsers |
| –list-protocols | 显示所有支持的传输协议（rtmp/rtp等） |
| –list-bsfs | 显示所有可用的格式转换（h264_mp4toannexb/aac_adtstoasc等） |
| –list-indevs | 显示所有支持的输入设备（alsa/v4l2等） |
| –list-outdevs | 显示所有支持的输出设备（alsa/opengl等） |
| –list-filters | 显示支持的所有过滤器（scale/volume/fps/allyuv等） |
标准选项（Standard options）
编译配置
| 选项 | 说明 |
|---|---|
| –logfile=FILE | 配置过程中的log输出文件，默认输出到当前位置的ffbuild/config.log文件 |
| –disable-logging | 配置过程中不输出日志 |
| –fatal-warnings | 把配置过程中的任何警告当做致命的错误处理 |
| –prefix=PREFIX | 设定安装的跟目录，如果不指定默认是/usr |
| –bindir=DIR | 设置可执行程序的安装位置，默认是[PREFIX/bin] |
| –datadir=DIR | 设置测试程序以及数据的安装位置，默认是[PREFIX/share/ffmpeg] |
| –docdir=DIR | 设置文档的安装目录，默认是[PREFIX/share/doc/ffmpeg] |
| –libdir=DIR | 设置静态库的安装位置，默认是[PREFIX/lib] |
| –shlibdir=DIR | 设置动态库的安装位置，默认是[LIBDIR] |
| –incdir=DIR | 设置头文件的安装位置，默认是[PREFIX/include]；一般来说用于依赖此头文件来开发就够了 |
| –mandir=DIR | 设置man文件的安装目录，默认是[PREFIX/share/man] |
| –pkgconfigdir=DIR | 设置pkgconfig的安装目录，默认是[LIBDIR/pkgconfig]，只有--enable-shared使能的时候这个选项才有效 |
| –enable-rpath | use rpath to allow installing libraries in paths not part of the dynamic linker search path use rpath when linking programs [USE WITH CARE] |
| –install-name-dir=DIR | Darwin directory name for installed targets |
许可证选项（Licensing options）
选择许可证，FFMPEG默认许可证LGPL 2.1，如果需要加gpl的库需要使用gpl的许可证，例如libx264就是gpl的，如果需要加入libx264则需要--enable-gpl。
| 选项 | 说明 |
|---|---|
| –enable-gpl | allow use of GPL code, the resulting libs and binaries will be under GPL [no] |
| –enable-version3 | upgrade (L)GPL to version 3 [no] |
| –enable-nonfree | allow use of nonfree code, the resulting libs and binaries will be unredistributable [no] |
配置选项（Configuration options）
编译选项的配置
| 选项 | 说明 |
|---|---|
| –disable-static | 不生产静态库，默认生成静态库 |
| –enable-shared | 生成动态库，默认不生成动态库 |
| –enable-small | optimize for size instead of speed，默认开启 |
| –disable-runtime-cpudetect | disable detecting cpu capabilities at runtime (smaller binary)，默认开启 |
| –enable-gray | enable full grayscale support (slower color) |
| –disable-swscale-alpha | disable alpha channel support in swscale |
| –disable-all | 禁止编译所有库和可执行程序 |
| –enable-raise-major | 增加主版本号 |
程序选项（Program options）
可执行程序开启选项，默认编译ffmpeg中的所有可执行程序，包括ffmpeg、ffplay、ffprobe、ffserver，不过Mac平台默认情况下不生成ffplay，目前暂未知道啥原因。
| 选项 | 说明 |
|---|---|
| –disable-programs | do not build command line programs |
| –disable-ffmpeg | disable ffmpeg build |
| –disable-ffplay | disable ffplay build |
| –disable-ffprobe | disable ffprobe build |
| –disable-ffserver | disable ffserver build |
文档选项（Documentation options）
离线文档选择
| 选项 | 说明 |
|---|---|
| –disable-doc | do not build documentation |
| –disable-htmlpages | do not build HTML documentation pages |
| –disable-manpages | do not build man documentation pages |
| –disable-podpages | do not build POD documentation pages |
| –disable-txtpages | do not build text documentation pages |
组件选项（Component options）
除了avresample模块，默认编译所有模块。一般来说用于轻量化ffmpeg库的大小，可以仅仅开启指定某些组件的某些功能。
| 选项 | 说明 |
|---|---|
| –disable-avdevice | disable libavdevice build |
| –disable-avcodec | disable libavcodec build |
| –disable-avformat | disable libavformat build |
| –disable-swresample | disable libswresample build |
| –disable-swscale | disable libswscale build |
| –disable-postproc | disable libpostproc build |
| –disable-avfilter | disable libavfilter build |
| –enable-avresample | enable libavresample build [no] |
| –disable-pthreads | disable pthreads [autodetect] |
| –disable-w32threads | disable Win32 threads [autodetect] |
| –disable-os2threads | disable OS/2 threads [autodetect] |
| –disable-network | disable network support [no] |
| –disable-dct | disable DCT code |
| –disable-dwt | disable DWT code |
| –disable-error-resilience | disable error resilience code |
| –disable-lsp | disable LSP code |
| –disable-lzo | disable LZO decoder code |
| –disable-mdct | disable MDCT code |
| –disable-rdft | disable RDFT code |
| –disable-fft | disable FFT code |
| –disable-faan | disable floating point AAN (I)DCT code |
| –disable-pixelutils | disable pixel utils in libavutil |
个别组件选项（Individual component options）
可以用于设定开启指定功能，例如禁止所有encoders，在这里可以开启特定的encoders（x264、aac等）
| 选项 | 说明 |
|---|---|
| –disable-everything | disable all components listed below |
| –disable-encoder=NAME | disable encoder NAME |
| –enable-encoder=NAME | enable encoder NAME |
| –disable-encoders | disable all encoders |
| –disable-decoder=NAME | disable decoder NAME |
| –enable-decoder=NAME | enable decoder NAME |
| –disable-decoders | disable all decoders |
| –disable-hwaccel=NAME | disable hwaccel NAME |
| –enable-hwaccel=NAME | enable hwaccel NAME |
| –disable-hwaccels | disable all hwaccels |
| –disable-muxer=NAME | disable muxer NAME |
| –enable-muxer=NAME | enable muxer NAME |
| –disable-muxers | disable all muxers |
| –disable-demuxer=NAME | disable demuxer NAME |
| –enable-demuxer=NAME | enable demuxer NAME |
| –disable-demuxers | disable all demuxers |
| –enable-parser=NAME | enable parser NAME |
| –disable-parser=NAME | disable parser NAME |
| –disable-parsers | disable all parsers |
| –enable-bsf=NAME | enable bitstream filter NAME |
| –disable-bsf=NAME | disable bitstream filter NAME |
| –disable-bsfs | disable all bitstream filters |
| –enable-protocol=NAME | enable protocol NAME |
| –disable-protocol=NAME | disable protocol NAME |
| –disable-protocols | disable all protocols |
| –enable-indev=NAME | enable input device NAME |
| –disable-indev=NAME | disable input device NAME |
| –disable-indevs | disable input devices |
| –enable-outdev=NAME | enable output device NAME |
| –disable-outdev=NAME | disable output device NAME |
| –disable-outdevs | disable output devices |
| –disable-devices | disable all devices |
| –enable-filter=NAME | enable filter NAME |
| –disable-filter=NAME | disable filter NAME |
| –disable-filters | disable all filters |
扩展库支持（External library support）
ffmpeg提供的一些功能是由其他扩展库支持的，如果需要使用需要明确声明，确定编译的第三方库的目标架构--arch相同就好了，在编译ffmpeg的时候需加入第三方库的头文和库搜索路径（通过extra-cflags和extra-ldflags指定即可），剩下的事ffmpeg都给你做好了。
- libx264例子
ffmpeg集成libx264官方文档
$ git clone http://source.ffmpeg.org/git/ffmpeg.git
$ cd x264
$ ./configure --prefix=$FFMPEG_PREFIX --enable-static --enable-shared
$ make -j8 && make install| 选项 | 说明 |
|---|---|
| –enable-avisynth | enable reading of AviSynth script files [no] |
| –disable-bzlib | disable bzlib [autodetect] |
| –enable-chromaprint | enable audio fingerprinting with chromaprint [no] |
| –enable-frei0r | enable frei0r video filtering [no] |
| –enable-gcrypt | enable gcrypt, needed for rtmp(t)e support if openssl, librtmp or gmp is not used [no] |
| –enable-gmp | enable gmp, needed for rtmp(t)e support if openssl or librtmp is not used [no] |
| –enable-gnutls | enable gnutls, needed for https support if openssl is not used [no] |
| –disable-iconv | disable iconv [autodetect] |
| –enable-jni | enable JNI support [no] |
| –enable-ladspa | enable LADSPA audio filtering [no] |
| –enable-libass | enable libass subtitles rendering, needed for subtitles and ass filter [no] |
| –enable-libbluray | enable BluRay reading using libbluray [no] |
| –enable-libbs2b | enable bs2b DSP library [no] |
| –enable-libcaca | enable textual display using libcaca [no] |
| –enable-libcelt | enable CELT decoding via libcelt [no] |
| –enable-libcdio | enable audio CD grabbing with libcdio [no] |
| –enable-libdc1394 | enable IIDC-1394 grabbing using libdc1394 and libraw1394 [no] |
| –enable-libebur128 | enable libebur128 for EBU R128 measurement, needed for loudnorm filter [no] |
| –enable-libfdk-aac | enable AAC de/encoding via libfdk-aac [no] |
| –enable-libflite | enable flite (voice synthesis) support via libflite [no] |
| –enable-libfontconfig | enable libfontconfig, useful for drawtext filter [no] |
| –enable-libfreetype | enable libfreetype, needed for drawtext filter [no] |
| –enable-libfribidi | enable libfribidi, improves drawtext filter [no] |
| –enable-libgme | enable Game Music Emu via libgme [no] |
| –enable-libgsm | enable GSM de/encoding via libgsm [no] |
| –enable-libiec61883 | enable iec61883 via libiec61883 [no] |
| –enable-libilbc | enable iLBC de/encoding via libilbc [no] |
| –enable-libkvazaar | enable HEVC encoding via libkvazaar [no] |
| –enable-libmodplug | enable ModPlug via libmodplug [no] |
| –enable-libmp3lame | enable MP3 encoding via libmp3lame [no] |
| –enable-libnut | enable NUT (de)muxing via libnut, native (de)muxer exists [no] |
| –enable-libopencore-amrnb | enable AMR-NB de/encoding via libopencore-amrnb [no] |
| –enable-libopencore-amrwb | enable AMR-WB decoding via libopencore-amrwb [no] |
| –enable-libopencv | enable video filtering via libopencv [no] |
| –enable-libopenh264 | enable H.264 encoding via OpenH264 [no] |
| –enable-libopenjpeg | enable JPEG 2000 de/encoding via OpenJPEG [no] |
| –enable-libopenmpt | enable decoding tracked files via libopenmpt [no] |
| –enable-libopus | enable Opus de/encoding via libopus [no] |
| –enable-libpulse | enable Pulseaudio input via libpulse [no] |
| –enable-librubberband | enable rubberband needed for rubberband filter [no] |
| –enable-librtmp | enable RTMP[E] support via librtmp [no] |
| –enable-libschroedinger | enable Dirac de/encoding via libschroedinger [no] |
| –enable-libshine | enable fixed-point MP3 encoding via libshine [no] |
| –enable-libsmbclient | enable Samba protocol via libsmbclient [no] |
| –enable-libsnappy | enable Snappy compression, needed for hap encoding [no] |
| –enable-libsoxr | enable Include libsoxr resampling [no] |
| –enable-libspeex | enable Speex de/encoding via libspeex [no] |
| –enable-libssh | enable SFTP protocol via libssh [no] |
| –enable-libtesseract | enable Tesseract, needed for ocr filter [no] |
| –enable-libtheora | enable Theora encoding via libtheora [no] |
| –enable-libtwolame | enable MP2 encoding via libtwolame [no] |
| –enable-libv4l2 | enable libv4l2/v4l-utils [no] |
| –enable-libvidstab | enable video stabilization using vid.stab [no] |
| –enable-libvo-amrwbenc | enable AMR-WB encoding via libvo-amrwbenc [no] |
| –enable-libvorbis | enable Vorbis en/decoding via libvorbis, native implementation exists [no] |
| –enable-libvpx | enable VP8 and VP9 de/encoding via libvpx [no] |
| –enable-libwavpack | enable wavpack encoding via libwavpack [no] |
| –enable-libwebp | enable WebP encoding via libwebp [no] |
| –enable-libx264 | enable H.264 encoding via x264 [no] |
| –enable-libx265 | enable HEVC encoding via x265 [no] |
| –enable-libxavs | enable AVS encoding via xavs [no] |
| –enable-libxcb | enable X11 grabbing using XCB [autodetect] |
| –enable-libxcb-shm | enable X11 grabbing shm communication [autodetect] |
| –enable-libxcb-xfixes | enable X11 grabbing mouse rendering [autodetect] |
| –enable-libxcb-shape | enable X11 grabbing shape rendering [autodetect] |
| –enable-libxvid | enable Xvid encoding via xvidcore, native MPEG-4/Xvid encoder exists [no] |
| –enable-libzimg | enable z.lib, needed for zscale filter [no] |
| –enable-libzmq | enable message passing via libzmq [no] |
| –enable-libzvbi | enable teletext support via libzvbi [no] |
| –disable-lzma | disable lzma [autodetect] |
| –enable-decklink | enable Blackmagic DeckLink I/O support [no] |
| –enable-mediacodec | enable Android MediaCodec support [no] |
| –enable-netcdf | enable NetCDF, needed for sofalizer filter [no] |
| –enable-openal | enable OpenAL 1.1 capture support [no] |
| –enable-opencl | enable OpenCL code |
| –enable-opengl | enable OpenGL rendering [no] |
| –enable-openssl | enable openssl, needed for https support if gnutls is not used [no] |
| –disable-schannel | disable SChannel SSP, needed for TLS support on Windows if openssl and gnutls are not used [autodetect] |
| –disable-sdl2 | disable sdl2 [autodetect] |
| –disable-securetransport | disable Secure Transport, needed for TLS support on OSX if openssl and gnutls are not used [autodetect] |
| –enable-x11grab | enable X11 grabbing (legacy) [no] |
| –disable-xlib | disable xlib [autodetect] |
| –disable-zlib | disable zlib [autodetect] |
硬件加速功能（hardware acceleration features）
ffmpeg默认实现了移动端（Android和IOS）的硬编解码，可以选择disable的都是默认开启的，可以关闭，可以选择enable的都是需要自己解决依赖的。
| 选项 | 说明 |
|---|---|
| –disable-audiotoolbox | disable Apple AudioToolbox code [autodetect] |
| –enable-cuda | enable dynamically linked Nvidia CUDA code [no] |
| –enable-cuvid | enable Nvidia CUVID support [autodetect] |
| –disable-d3d11va | disable Microsoft Direct3D 11 video acceleration code [autodetect] |
| –disable-dxva2 | disable Microsoft DirectX 9 video acceleration code [autodetect] |
| –enable-libmfx | enable Intel MediaSDK (AKA Quick Sync Video) code via libmfx [no] |
| –enable-libnpp | enable Nvidia Performance Primitives-based code [no] |
| –enable-mmal | enable Broadcom Multi-Media Abstraction Layer (Raspberry Pi) via MMAL [no] |
| –disable-nvenc | disable Nvidia video encoding code [autodetect] |
| –enable-omx | enable OpenMAX IL code [no] |
| –enable-omx-rpi | enable OpenMAX IL code for Raspberry Pi [no] |
| –disable-vaapi | disable Video Acceleration API (mainly Unix/Intel) code [autodetect] |
| –disable-vda | disable Apple Video Decode Acceleration code [autodetect] |
| –disable-vdpau | disable Nvidia Video Decode and Presentation API for Unix code [autodetect] |
| –disable-videotoolbox | disable VideoToolbox code [autodetect] |
工具链选项（Toolchain options）
ffmpeg代码本身是支持跨平台的，要编译不同的平台需要配置不同平台的交叉编译工具链。ffmpeg都是c代码，所以不需要配置c++的sysroot。常用的就几个arch,cpu,cross-prefix,enable-cross-compile,sysroot,target-os,extra-cflags,extra-ldflags,enable-pic。现在Android和IOS几乎没有armv5的设备了，所以如果编译这两个平台配置armv7和armv8就好了。
| 选项 | 说明 |
|---|---|
| –arch=ARCH | 选择目标架构[armv7a/aarch64/x86/x86_64等] |
| –cpu=CPU | 选择目标cpu[armv7-a/armv8-a/x86/x86_64] |
| –cross-prefix=PREFIX | 设定交叉编译工具链的前缀,不算gcc/nm/as命令，例如android 32位的交叉编译链$ndk_dir/toolchains/arm-linux-androideabi-$toolchain_version/prebuilt/linux-$host_arch/bin/arm-linux-androideabi- |
| –progs-suffix=SUFFIX | program name suffix [] |
| –enable-cross-compile | 如果目标平台和编译平台不同则需要使能它 |
| –sysroot=PATH | 交叉工具链的头文件和库位，例如Android 32位位置$ndk_dir/platforms/android-14/arch-arm |
| –sysinclude=PATH | location of cross-build system headers |
| –target-os=OS | 设置目标系统 |
| –target-exec=CMD | command to run executables on target |
| –target-path=DIR | path to view of build directory on target |
| –target-samples=DIR | path to samples directory on target |
| –tempprefix=PATH | force fixed dir/prefix instead of mktemp for checks |
| –toolchain=NAME | set tool defaults according to NAME |
| –nm=NM | use nm tool NM [nm -g] |
| –ar=AR | use archive tool AR [ar] |
| –as=AS | use assembler AS [] |
| –ln_s=LN_S | use symbolic link tool LN_S [ln -s -f] |
| –strip=STRIP | use strip tool STRIP [strip] |
| –windres=WINDRES | use windows resource compiler WINDRES [windres] |
| –yasmexe=EXE | use yasm-compatible assembler EXE [yasm] |
| –cc=CC | use C compiler CC [gcc] |
| –cxx=CXX | use C compiler CXX [g++] |
| –objcc=OCC | use ObjC compiler OCC [gcc] |
| –dep-cc=DEPCC | use dependency generator DEPCC [gcc] |
| –ld=LD | use linker LD [] |
| –pkg-config=PKGCONFIG | use pkg-config tool PKGCONFIG [pkg-config] |
| –pkg-config-flags=FLAGS | pass additional flags to pkgconf [] |
| –ranlib=RANLIB | use ranlib RANLIB [ranlib] |
| –doxygen=DOXYGEN | use DOXYGEN to generate API doc [doxygen] |
| –host-cc=HOSTCC | use host C compiler HOSTCC |
| –host-cflags=HCFLAGS | use HCFLAGS when compiling for host |
| –host-cppflags=HCPPFLAGS | use HCPPFLAGS when compiling for host |
| –host-ld=HOSTLD | use host linker HOSTLD |
| –host-ldflags=HLDFLAGS | use HLDFLAGS when linking for host |
| –host-libs=HLIBS | use libs HLIBS when linking for host |
| –host-os=OS | compiler host OS [] |
| –extra-cflags=ECFLAGS | 设置cflags，如果是Android平台可以根据ndk内的设定,arm-linux-androideabi-4.6/setup.mk，建议参考你当前的setup来配置 |
| –extra-cxxflags=ECFLAGS | add ECFLAGS to CXXFLAGS [] |
| –extra-objcflags=FLAGS | add FLAGS to OBJCFLAGS [] |
| –extra-ldflags=ELDFLAGS | 参考cflags |
| –extra-ldexeflags=ELDFLAGS | add ELDFLAGS to LDEXEFLAGS [] |
| –extra-ldlibflags=ELDFLAGS | add ELDFLAGS to LDLIBFLAGS [] |
| –extra-libs=ELIBS | add ELIBS [] |
| –extra-version=STRING | version string suffix [] |
| –optflags=OPTFLAGS | override optimization-related compiler flags |
| –build-suffix=SUFFIX | library name suffix [] |
| –enable-pic | build position-independent code |
| –enable-thumb | compile for Thumb instruction set |
| –enable-lto | use link-time optimization |
| –env=”ENV=override” | override the environment variables |
高级选项（Advanced options）
| 选项 | 说明 |
|---|---|
| –malloc-prefix=PREFIX | prefix malloc and related names with PREFIX |
| –custom-allocator=NAME | use a supported custom allocator |
| –disable-symver | disable symbol versioning |
| –enable-hardcoded-tables | use hardcoded tables instead of runtime generation |
| –disable-safe-bitstream-reader | disable buffer boundary checking in bitreaders (faster, but may crash) |
| –enable-memalign-hack | emulate memalign, interferes with memory debuggers |
| –sws-max-filter-size=N | the max filter size swscale uses [256] |
优化选项（Optimization options）
默认开启各个平台的汇编优化，有些嵌入式平台可能并不能完整的支持架构的所有汇编指令，所以需要关闭。（自己理解的，没有实战）
| 选项 | 说明 |
|---|---|
| –disable-asm | disable all assembly optimizations |
| –disable-altivec | disable AltiVec optimizations |
| –disable-vsx | disable VSX optimizations |
| –disable-power8 | disable POWER8 optimizations |
| –disable-amd3dnow | disable 3DNow! optimizations |
| –disable-amd3dnowext | disable 3DNow! extended optimizations |
| –disable-mmx | disable MMX optimizations |
| –disable-mmxext | disable MMXEXT optimizations |
| –disable-sse | disable SSE optimizations |
| –disable-sse2 | disable SSE2 optimizations |
| –disable-sse3 | disable SSE3 optimizations |
| –disable-ssse3 | disable SSSE3 optimizations |
| –disable-sse4 | disable SSE4 optimizations |
| –disable-sse42 | disable SSE4.2 optimizations |
| –disable-avx | disable AVX optimizations |
| –disable-xop | disable XOP optimizations |
| –disable-fma3 | disable FMA3 optimizations |
| –disable-fma4 | disable FMA4 optimizations |
| –disable-avx2 | disable AVX2 optimizations |
| –disable-aesni | disable AESNI optimizations |
| –disable-armv5te | disable armv5te optimizations |
| –disable-armv6 | disable armv6 optimizations |
| –disable-armv6t2 | disable armv6t2 optimizations |
| –disable-vfp | disable VFP optimizations |
| –disable-neon | disable NEON optimizations |
| –disable-inline-asm | disable use of inline assembly |
| –disable-yasm | disable use of nasm/yasm assembly |
| –disable-mipsdsp | disable MIPS DSP ASE R1 optimizations |
| –disable-mipsdspr2 | disable MIPS DSP ASE R2 optimizations |
| –disable-msa | disable MSA optimizations |
| –disable-mipsfpu | disable floating point MIPS optimizations |
| –disable-mmi | disable Loongson SIMD optimizations |
| –disable-fast-unaligned | consider unaligned accesses slow |
开发者选项（Developer options）
调试用的一些开关
| 选项 | 说明 |
|---|---|
| –disable-debug | disable debugging symbols |
| –enable-debug=LEVEL | set the debug level [] |
| –disable-optimizations | disable compiler optimizations |
| –enable-extra-warnings | enable more compiler warnings |
| –disable-stripping | disable stripping of executables and shared libraries |
| –assert-level=level | 0(default), 1 or 2, amount of assertion testing, 2 causes a slowdown at runtime. |
| –enable-memory-poisoning | fill heap uninitialized allocated space with arbitrary data |
| –valgrind=VALGRIND | run “make fate” tests through valgrind to detect memory leaks and errors, using the specified valgrind binary. Cannot be combined with –target-exec |
| –enable-ftrapv | Trap arithmetic overflows |
| –samples=PATH | location of test samples for FATE, if not set use $FATE_SAMPLES at make invocation time. |
| –enable-neon-clobber-test | check NEON registers for clobbering (should be used only for debugging purposes) |
| –enable-xmm-clobber-test | check XMM registers for clobbering (Win64-only; should be used only for debugging purposes) |
| –enable-random | randomly enable/disable components |
| –disable-random | |
| –enable-random=LIST | randomly enable/disable specific components or |
| –disable-random=LIST | component groups. LIST is a comma-separated list of NAME[:PROB] entries where NAME is a component (group) and PROB the probability associated with |
| –random-seed=VALUE | seed value for –enable/disable-random |
| –disable-valgrind-backtrace | do not print a backtrace under Valgrind (only applies to –disable-optimizations builds) |