The compiler lacks knowledge of such wrappers outside the

  translation unit which defines them, which means that some

  optimizations and security checks are not performed. Adding

  declarations can remedy this to some extent, but these

  annotations have to be maintained carefully for feature parity

  with the standard implementation.

  with `warn_unused_result` as well.

  * Duplicating the buffer length checks based on the

  desirable if the wrapper processes arrays. (This

  functionality is used by the

  `-D_FORTIFY_SOURCE=2` checks to guard

  Storing it in a global variable is therefore incorrect.

  Particularly if you are dealing with callbacks, you may have to

  store the pointer in a thread-local variable (defined with

  complexity of calling back into Java code.

  Keep in mind that C/C++ and Java are different languages,

  The Autoconf macro `AC_GNU_SOURCE` ensures this.

  * Check for the presence of the `secure_getenv`

  performs these checks.

  * Arrange for a proper definition of the

  unexpected way.

  Either the `secure_getenv` function or the

  [[ex-Defensive_Coding-Tasks-secure_getenv]]

  .Obtaining a definition for `secure_getenv`