C 宏定义配置

通过OpenResty或者Nginx内核方式构建该模块，你可以定义下面的C宏定义作为可选项提供给C编译器：

NGX_LUA_USE_ASSERT 声明后，将在ngx_lua C代码中开启断言。推荐用在调试或者测试版本中。启用后，它会引入额外一些（小的）运行时开销。在v0.9.10版本中首次引入此选项。
NGX_LUA_ABORT_AT_PANIC 当Lua/LuaJIT虚拟机出现panic错误时，ngx_lua默认会让当前的工作进程优雅退出。通过指定这个宏定义，ngx_lua将立即终止当前的nginx工作进程（通常会生成一个core dump文件）。这个选项主要用来调试虚拟机的panic错误。在v0.9.8版本中首次引入此选项。
NGX_LUA_NO_FFI_API 去除Nginx中FFI-based Lua API需要的的纯C函数(例如 lua-resty-core 所需要的)。开启这个宏可以让Nginx二进制代码更小。

在NGINX或者OpenResty启用一个或多个宏定义，只用传给./configure脚本几个额外的C编译选项。例如：

#    ./configure --with-cc-opt="-DNGX_LUA_USE_ASSERT -DNGX_LUA_ABORT_AT_PANIC"

English source:

C Macro Configurations

While building this module either via OpenResty or with the NGINX core, you can define the following C macros via the C compiler options:

NGX_LUA_USE_ASSERT When defined, will enable assertions in the ngx_lua C code base. Recommended for debugging or testing builds. It can introduce some (small) runtime overhead when enabled. This macro was first introduced in the v0.9.10 release.
NGX_LUA_ABORT_AT_PANIC When the Lua/LuaJIT VM panics, ngx_lua will instruct the current nginx worker process to quit gracefully by default. By specifying this C macro, ngx_lua will abort the current nginx worker process (which usually result in a core dump file) immediately. This option is useful for debugging VM panics. This option was first introduced in the v0.9.8 release.
NGX_LUA_NO_FFI_API Excludes pure C API functions for FFI-based Lua API for NGINX (as required by lua-resty-core, for example). Enabling this macro can make the resulting binary code size smaller.

To enable one or more of these macros, just pass extra C compiler options to the ./configure script of either NGINX or OpenResty. For instance,

./configure --with-cc-opt="-DNGX_LUA_USE_ASSERT -DNGX_LUA_ABORT_AT_PANIC"