The Lua programming language with some additional compile-time configuration options.

See lua.org for more infomation on the Lua language.

All additional options are controlled by preprocessor defines in luaconf.h.

Disable all floating point support in Lua. Only integers will be supported for numeric operations. This removes any dependency on the standard C library's <math.h>. Setting this will also remove the following features, which require floating point support:

• Floating point format specifiers for string.format (A, a, E, e, f, G, and g).
• Floating point format specifiers for string.pack, string.packsize, and string.unpack (f, d, and n).
• Floating point literals (e.g -3.5 or 7e5).
• Floating point output of collectgarbage("count"). Instead of a fractional value in kilobytes this call will return the total number of bytes as an integer.
• The ^ (power) operator.
• The zero-parameter form of math.random. The function will always require one or two parameters.
• math.acos
• math.asin
• math.atan2
• math.atan
• math.ceil
• math.cos
• math.cosh
• math.deg
• math.exp
• math.floor
• math.fmod
• math.frexp
• math.huge
• math.ldexp
• math.log10
• math.log
• math.modf
• math.pi
• math.pow
• math.rad
• math.sin
• math.sinh
• math.sqrt
• math.tan
• math.tanh

Disable file system support in Lua. It is still possible to create io file objects in C code and pass them to Lua scripts. The standard streams (stdin, stdout, and stderr) will continue to exist. Setting this will remove the following features, which require file system support:

• The ability to pass a string containing a file name to be opened to io.input, io.lines, or io.output.
• dofile
• io.open
• io.tmpfile
• loadfile
• module
• os.remove
• os.rename
• os.tmpname
• package.config
• package.cpath
• package.loadlib
• package.path
• package.preload
• package.searchers
• package.searchpath
• require
• seeall

Note: this option does not remove the ability to load Lua files from within C code (for example, using luaL_loadfile).

Disable subprocess execution in Lua to prevent Lua from invoking other executables. Setting this will remove the following features, which provide Lua's subprocess capabilities:

• io.popen
• os.execute

Disable ability for Lua scripts to explicitly terminate their own process. This does not prevent other behaviours such as unhandled errors or failed assertions from doing so, however. Setting this will remove the following feature, which provides Lua's exit capability:

• os.exit