[Bug 910] [build] meson build not support some c_args

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=910

            Bug ID: 910
           Summary: [build] meson build not support some c_args
           Product: DPDK
           Version: 21.11
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: meson
          Assignee: dev at dpdk.org
          Reporter: junx.dong at intel.com
  Target Milestone: ---

1.DPDK version:
    version: 21.11.0-rc0

2.OS version:
  OS: Ubuntu 20.04.3 LTS/5.8.0-48-generic
  gcc version: (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0

3. Config meson build command, contain c_args parameter 
  DRTE_MBUF_DEFAULT_MEMPOOL_OPS, as follow:
  CC=gcc meson -Denable_kmods=True -Dlibdir=lib -Dc_args=-DRTE_MBUF_DEFAULT_
  MEMPOOL_OPS=stack --default-library=static x86 _64-native-linuxapp-gcc

4. Check the build output.
  There is warning information of redefined parameter
  171149 [6/2720] Compiling C object lib/librte_eal.a.p/eal_common_eal_common_
  hypervisor.c.o^M 
  171150 In file included from <command-line>:^M ./config/rte_config.h:52: 
  warning: 
  "RTE_MBUF_DEFAULT_MEMPOOL_OPS" redefined^M  #define
RTE_MBUF_DEFAULT_MEMPOOL_OPS 
  "ring_mp_mc"^M

5. The list of othe c_args parameters having same issues:
  RTE_LIBRTE_IP_FRAG_MAX_FRAG
  RTE_LIBRTE_I40E_QUEUE_NUM_PER_VM
  RTE_LIBRTE_I40E_RX_ALLOW_BULK_ALLOC

6. About RTE_LIBRTE_I40E_16BYTE_RX_DESC, it was undefined in
config/rte_config.h, 
  if i defined it in meson build command, it is also cancel, please also
analysis 
  this parameter. thanks.

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