Mercurial > gnulib
view doc/posix-functions/unsetenv.texi @ 40246:c34f677e6117 default tip master
_Noreturn: GCC 4.7 does not support [[noreturn]] in C++11 mode
* lib/_Noreturn.h, m4/gnulib-common.m4: Don't use [[noreturn]] before
GCC 4.8.
author | Akim Demaille <akim.demaille@gmail.com> |
---|---|
date | Sun, 17 Mar 2019 19:27:20 +0100 |
parents | 73d60b1f9c96 |
children |
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@node unsetenv @section @code{unsetenv} @findex unsetenv POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/unsetenv.html} Gnulib module: unsetenv Portability problems fixed by Gnulib: @itemize @item This function is missing on some platforms: AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, mingw, MSVC 14, BeOS. @item This function is not declared on some platforms: OSF/1 5.1. @item This function has the return type @samp{void} instead of @samp{int} on some platforms: Mac OS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1. @item On some platforms, this function does not fail with @samp{EINVAL} when passed an empty string or a string containing @samp{=}: FreeBSD 6.0, NetBSD 1.6, OpenBSD 4.7. @item This function removes only the first value association for the given environment variable, not all of them, on some platforms: Solaris 11.4, Haiku. @end itemize Portability problems not fixed by Gnulib: @itemize @item Older versions of POSIX required that @code{unsetenv(NULL)} gracefully fail with @code{EINVAL}, but not all implementations guarantee this, and the requirement was removed. @end itemize