Re: [dpdk-dev] [PATCH] ethdev: fix dpdk gcc build on Arm

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 6/3/2020 11:16 AM, Thomas Monjalon wrote:
> 03/06/2020 11:48, Juraj Linkeš:
>> Directive #include <file> in gcc implementation searches for files
>> in a standard list of system directories, which leads to a sporadici
>> build error on Taishan arm machines:
>> /tmp/openvpp-testing/dpdk/lib/librte_ethdev/rte_ethdev.h:4287:10:
>> fatal error: rte_ethdev_core.h:
>> No such file or directory #include <rte_ethdev_core.h>
> 
> Would be interesting to know why nobody else hit such error?


I can't see why this is happening, in the 'mk/rte.lib.mk' we have following:

"
install: _preinstall build _postinstall
build: _preinstall
"

Which should cause the library header files installed before building .c files
in that library.
So when compiling 'rte_class_eth.c', the header files should be already in
install folder.


I can see how/why changing to "" fixes the issue but I am not sure about this fix.
"rte_ethdev.h" is a public header file, that applications will include it in
their applications. In the public library it is more proper to have other
includes from system folder, using format <>.
Again, I can't see why it is failing but I believe we should find another
solution for _internal_ build error.


A very simple solution can be following, but that is also not good, since it
solves the issue by creating a dependency to the order of the header includes:
 diff --git a/lib/librte_ethdev/rte_class_eth.c b/lib/librte_ethdev/rte_class_eth.c
 index 6338355e25..3030c49020 100644
 --- a/lib/librte_ethdev/rte_class_eth.c
 +++ b/lib/librte_ethdev/rte_class_eth.c
 @@ -10,8 +10,8 @@
  #include <rte_kvargs.h>
  #include <rte_log.h>

 -#include "rte_ethdev.h"
  #include "rte_ethdev_core.h"
 +#include "rte_ethdev.h"
  #include "rte_ethdev_driver.h"
  #include "ethdev_private.h"



> 
> 
>> Fix this by replacing the directive with #include "file" which searches
>> for files first in the directory containing the current file and other
>> directories only after that.
>>
>> Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>
> 
> What about #include <rte_ethdev_trace.h> ?
> 
> Except this,
> Acked-by: Thomas Monjalon <thomas@monjalon.net>
> 
> 
> I would change the title to be more generic (nothing specific to gcc or Arm here):
> 	ethdev: fix local include
> 
> It needs to be backported, so these lines are required:
> 	Fixes: 7f0a669e7b04 ("ethdev: add allocation helper for virtual drivers")
> 	Fixes: dcd5c8112bc3 ("ethdev: add PCI driver helpers")
> 	Fixes: ffc905f3b856 ("ethdev: separate driver APIs")
> 	Fixes: 331c447ad913 ("ethdev: separate internal structures into own header")
> 	Cc: stable@dpdk.org
> 
> 
>