一、编译命令行详解
./configure --help
Usage: ./configure [options]
Help:
-h, --help print this message
Standard options:
--prefix=PREFIX install architecture-independent files in PREFIX [/usr/local]
--exec-prefix=EPREFIX install architecture-dependent files in EPREFIX [PREFIX]
--bindir=DIR install binaries in DIR [EPREFIX/bin]
--libdir=DIR install libs in DIR [EPREFIX/lib]
--includedir=DIR install includes in DIR [PREFIX/include]
--extra-asflags=EASFLAGS add EASFLAGS to ASFLAGS
--extra-cflags=ECFLAGS add ECFLAGS to CFLAGS
--extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS
--extra-rcflags=ERCFLAGS add ERCFLAGS to RCFLAGS
Configuration options:
--disable-cli disable cli
--system-libx264 use system libx264 instead of internal
--enable-shared build shared library
--enable-static build static library
--disable-opencl disable OpenCL features
--disable-gpl disable GPL-only features
--disable-thread disable multithreaded encoding
--disable-win32thread disable win32threads (windows only)
--disable-interlaced disable interlaced encoding support
--bit-depth=BIT_DEPTH set output bit depth (8, 10, all) [all]
--chroma-format=FORMAT output chroma format (400, 420, 422, 444, all) [all]
Advanced options:
--disable-asm disable platform-specific assembly optimizations
--enable-lto enable link-time optimization------自动寻找可优化函数，进行内联优化等
--enable-debug add -g
--enable-gprof add -pg
--enable-strip add -s
--enable-pic build position-independent code
Cross-compilation:
--host=HOST build programs to run on HOST
--cross-prefix=PREFIX use PREFIX for compilation tools
--sysroot=SYSROOT root of cross-build tree
External library support:
--disable-avs disable avisynth support
--disable-swscale disable swscale support
--disable-lavf disable libavformat support
--disable-ffms disable ffmpegsource support
--disable-gpac disable gpac support
--disable-lsmash disable lsmash support
二、编译命令行示例
关闭一些不使用的编译选项，减少不必要的代码分支判断，提高性能。
./configure --disable-avs --disable-swscale --disable-lavf --disable-ffms --disable-lsmash --disable-gpac --disable-interlaced --enable-shared --enable-lto --bit-depth=8 --chroma-format=420 --extra-ldflags=-Wl,--output-def=libx264.def
三、实测gcc编译选项
gcc -Wno-maybe-uninitialized -Wshadow -O3 -ffast-math -m64 -Wall -I. -I. -D_POSIX_C_SOURCE=200112L -std=gnu99 -D_GNU_SOURCE -fomit-frame-pointer -flto -fno-tree-vectorize
《微软编译选项》
四、实测nasm编译选项
nasm -I. -I. -DARCH_X86_64=1 -I./common/x86/ -f win64 -DSTACK_ALIGNMENT=16 -DPIC
nasm官网：https://www.nasm.us/