There is no convenient way to generate a list of all available
hosts.
+To fit diverse usage models, NEWLIB supports a group of configuration
+options so that library features can be turned on/off according to
+target system's requirements.
+
+One feature can be enabled by specifying `--enable-FEATURE=yes' or
+`--enable-FEATURE'. Or it can be disable by `--enable-FEATURE=no' or
+`--disable-FEATURE'.
+
+`--enable-newlib-io-pos-args'
+ Enable printf-family positional arg support.
+ Disabled by default, but some hosts enable it in configure.host.
+
+`--enable-newlib-io-c99-formats'
+ Enable C99 support in IO functions like printf/scanf.
+ Disabled by default, but some hosts enable it in configure.host.
+
+`--enable-newlib-register-fini'
+ Enable finalization function registration using atexit.
+ Disabled by default.
+
+`--enable-newlib-io-long-long'
+ Enable long long type support in IO functions like printf/scanf.
+ Disabled by default, but many hosts enable it in configure.host.
+
+`--enable-newlib-io-long-double'
+ Enable long double type support in IO functions printf/scanf.
+ Disabled by default, but some hosts enable it in configure.host.
+
+`--enable-newlib-mb'
+ Enable multibyte support.
+ Disabled by default.
+
+`--enable-newlib-iconv-encodings'
+ Enable specific comma-separated list of bidirectional iconv
+ encodings to be built-in.
+ Disabled by default.
+
+`--enable-newlib-iconv-from-encodings'
+ Enable specific comma-separated list of \"from\" iconv encodings
+ to be built-in.
+ Disabled by default.
+
+`--enable-newlib-iconv-to-encodings'
+ Enable specific comma-separated list of \"to\" iconv encodings
+ to be built-in.
+ Disabled by default.
+
+`--enable-newlib-iconv-external-ccs'
+ Enable capabilities to load external CCS files for iconv.
+ Disabled by default.
+
+`--disable-newlib-atexit-dynamic-alloc'
+ Disable dynamic allocation of atexit entries.
+ Most hosts and targets have it enabled in configure.host.
+
+`--enable-newlib-reent-small'
+ Enable small reentrant struct support.
+ Disabled by default.
+
+`--disable-newlib-fvwrite-in-streamio'
+ NEWLIB implements the vector buffer mechanism to support stream IO
+ buffering required by C standard. This feature is possibly
+ unnecessary for embedded systems which won't change file buffering
+ with functions like `setbuf' or `setvbuf'. The buffering mechanism
+ still acts as default for STDIN/STDOUT/STDERR even if this option
+ is specified.
+ Enabled by default.
+
+`--disable-newlib-fseek-optimization'
+ Disable fseek optimization. It can decrease code size of application
+ calling `fseek`.
+ Enabled by default.
+
+`--disable-newlib-wide-orient'
+ C99 states that each stream has an orientation, wide or byte. This
+ feature is possibly unnecessary for embedded systems which only do
+ byte input/output operations on stream. It can decrease code size
+ by disable the feature.
+ Enabled by default.
+
+`--enable-newlib-nano-malloc'
+ NEWLIB has two implementations of malloc family's functions, one in
+ `mallocr.c' and the other one in `nano-mallocr.c'. This options
+ enables the nano-malloc implementation, which is for small systems
+ with very limited memory. Note that this implementation does not
+ support `--enable-malloc-debugging' any more.
+ Disabled by default.
+
+`--enable-multilib'
+ Build many library versions.
+ Enabled by default.
+
+`--enable-target-optspace'
+ Optimize for space.
+ Disabled by default.
+
+`--enable-malloc-debugging'
+ Indicate malloc debugging requested.
+ Disabled by default.
+
+`--enable-newlib-multithread'
+ Enable support for multiple threads.
+ Enabled by default.
+
+`--enable-newlib-iconv'
+ Enable iconv library support.
+ Disabled by default.
+
+`--enable-newlib-elix-level'
+ Supply desired elix library level (1-4). Please refer to HOWTO for
+ more information about this option.
+ Set to level 0 by default.
+
+`--disable-newlib-io-float'
+ Disable printf/scanf family float support.
+ Enabled by default.
+
+`--disable-newlib-supplied-syscalls'
+ Disable newlib from supplying syscalls.
+ Enabled by default.
+
Running the Testsuite
=====================