Re: [dpdk-dev] [PATCH v9] eal: remove sys/queue.h from public headers

[Narcisa Ana Maria Vasile <navasile@linux.microsoft.com>]

On Tue, Aug 24, 2021 at 04:21:03PM +0000, William Tu wrote:
> Currently there are some public headers that include 'sys/queue.h', which
> is not POSIX, but usually provided by the Linux/BSD system library.
> (Not in POSIX.1, POSIX.1-2001, or POSIX.1-2008. Present on the BSDs.)
> The file is missing on Windows. During the Windows build, DPDK uses a
> bundled copy, so building a DPDK library works fine.  But when OVS or other
> applications use DPDK as a library, because some DPDK public headers
> include 'sys/queue.h', on Windows, it triggers an error due to no such
> file.
> 
> One solution is to install the 'lib/eal/windows/include/sys/queue.h' into
> Windows environment, such as [1]. However, this means DPDK exports the
> functionalities of 'sys/queue.h' into the environment, which might cause
> symbols, macros, headers clashing with other applications.
> 
> The patch fixes it by removing the "#include <sys/queue.h>" from
> DPDK public headers, so programs including DPDK headers don't depend
> on the system to provide 'sys/queue.h'. When these public headers use
> macros such as TAILQ_xxx, we replace it by the ones with RTE_ prefix.
> For Windows, we copy the definitions from <sys/queue.h> to rte_os.h
> in Windows EAL. Note that these RTE_ macros are compatible with
> <sys/queue.h>, both at the level of API (to use with <sys/queue.h>
> macros in C files) and ABI (to avoid breaking it).
> 
> Additionally, the TAILQ_FOREACH_SAFE is not part of <sys/queue.h>,
> the patch replaces it with RTE_TAILQ_FOREACH_SAFE.
> 
> [1] http://mails.dpdk.org/archives/dev/2021-August/216304.html
> 
> Suggested-by: Nick Connolly <nick.connolly@mayadata.io>
> Suggested-by: Dmitry Kozliuk <Dmitry.Kozliuk@gmail.com>
> Acked-by: Dmitry Kozliuk <Dmitry.Kozliuk@gmail.com>
> Signed-off-by: William Tu <u9012063@gmail.com>
> ---
Acked-by: Narcisa Vasile <navasile@linux.microsoft.com>