如何检查configure支持哪些feature?

Question

运行configure时，很多时候需要加上一些特定的参数，比如--disable-FEATURE(FEATURE是特定与当前编译的程序的)，问题是如何知道要编译的程序支持哪些FEATURE? 如果我自己写一个程序，怎样配置才能支持一些FEATURE呢？

Answer 1

./configure --help

Answer 2

可以么？
在gcc里面运行./configure --help，输出下面结果，所有支持的feature都列出来了么？
至少那些CPU特定的参数就没有吧

Optional Features:
  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
  --enable-gold           use gold instead of ld
  --enable-libada         build libada directory
  --enable-libssp         build libssp directory
  --disable-ppl-version-check    disable check for PPL version
  --disable-cloog-version-check  disable check for CLooG version
  --enable-stage1-languages[=all]   choose additional languages to build during
                          stage1.  Mostly useful for compiler development.
  --enable-objc-gc        enable use of Boehm's garbage collector with the
                          GNU Objective-C runtime
  --enable-bootstrap      enable bootstrapping [yes if native build]
  --enable-serial-[{host,target,build}-]configure
                          force sequential configuration of
                          sub-packages for the host, target or build
                          machine, or all sub-packages
  --enable-maintainer-mode enable make rules and dependencies not useful
                          (and sometimes confusing) to the casual installer
  --enable-stage1-checking[=all]   choose additional checking for stage1
                          of the compiler
  --enable-werror         enable -Werror in bootstrap stage2 and later

Optional Packages:
  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
  --with-build-libsubdir=DIR  Directory where to find libraries for build system
  --with-mpfr-dir=PATH    this option has been REMOVED
  --with-mpfr=PATH        specify prefix directory for installed MPFR package.

Answer 3

Optional Features: 下面的这些，就是所支持的 FEATURE 啊。