In addition to the other topics on this page, we'll note here some + of the C99 features that appear in libstdc++. +
The C99 features depend on the --enable-c99 configure flag.
+ This flag is already on by default, but it can be disabled by the
+ user. Also, the configuration machinery will disable it if the
+ necessary support for C99 (e.g., header files) cannot be found.
+
As of GCC 3.0, C99 support includes classification functions
+ such as isnormal, isgreater,
+ isnan, etc.
+ The functions used for 'long long' support such as strtoll
+ are supported, as is the lldiv_t typedef. Also supported
+ are the wide character functions using 'long long', like
+ wcstoll.
+