openh264 在 osx 上的 nasm 问题

先在 pc 上编译，熟悉一下。

编译遇到一个问题：

nasm -DUNIX64 -DPREFIX -f macho64 -I./codec/common/x86/   -o codec/common/x86/cpuid.o codec/common/x86/cpuid.asm
nasm: fatal: unrecognised output format `macho64' - use -hf for a list
type `nasm -h' for help

需升级 nasm 版本

NASM needed to be installed for assembly code: workable version 2.07 or above, nasm can downloaded from http://www.nasm.us/ For Mac OSX 64-bit NASM needed to be below version 2.11.08 as nasm 2.11.08 will introduce error when using RIP-relative addresses in Mac OSX 64-bit

brew install homebrew/versions/nasm21106

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