Building DPDK with gcc 10.2.1 Generates Multiple Warning Messages

https://bugs.dpdk.org/show_bug.cgi?id=739

Bug ID: 739
Summary: Building DPDK with gcc 10.2.1 Generates Multiple
Warning Messages
Product: DPDK
Version: unspecified
Hardware: POWER
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: other
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

Created attachment 162
--> https://bugs.dpdk.org/attachment.cgi?id=162&action=edit
Full Build Output Including Warnings

Building DPDK 21.08-rc0 with gcc 10.2.1 on RHEL 8.3 generates multiple warnings, though the final executables appear to work correctly. Examples of such warnings include:

[115/2415] Compiling C object 'lib/76b5a35@@rte_eal@sta/eal_common_eal_common_trace_utils.c.o'. ../lib/eal/common/eal_common_trace_utils.c: In function ‘trace_epoch_time_save’:
../lib/eal/common/eal_common_trace_utils.c:284:22: note: the layout of aggregates containing vectors with 8-byte alignment has changed in GCC 5

  284 |  trace->uptime_ticks = avg;
      |  ~~~~~~~~~~~~~~~~~~~~^~~~~

[225/2415] Compiling C object 'lib/76b5a35@@rte_acl@sta/acl_acl_gen.c.o'. ../lib/acl/acl_gen.c: In function ‘acl_count_trie_types.constprop’:
../lib/acl/acl_gen.c:220:1: note: the layout of aggregates containing vectors with 4-byte alignment has changed in GCC 5
220 | acl_count_trie_types(struct acl_node_counters *counts,

      | ^~~~~~~~~~~~~~~~~~~~

...

[320/2415] Compiling C object 'lib/76b5a35@@rte_hash@sta/hash_rte_thash.c.o'. In file included from ../lib/mempool/rte_mempool.h:51,

                 from ../lib/mbuf/rte_mbuf.h:38,
                 from ../lib/net/rte_ip.h:31,
                 from ../lib/hash/rte_thash.h:29,
                 from ../lib/hash/rte_thash.c:5:

In function ‘rte_memcpy_func’,
inlined from ‘rte_thash_init_ctx’ at ../lib/hash/rte_thash.c:232:3:
../lib/eal/ppc/include/rte_memcpy.h:50:2: warning: writing 16 bytes into a region of size 0 [-Wstringop-overflow=]

   50 |  vec_vsx_st(vec_vsx_ld(0, src), 0, dst);
      |  ^~~~~~~~~~

...

[323/2415] Compiling C object 'lib/76b5a35@@rte_lpm@sta/lpm_rte_lpm.c.o'. ../lib/lpm/rte_lpm.c: In function ‘rte_lpm_create’:
../lib/lpm/rte_lpm.c:240:19: note: the layout of aggregates containing vectors with 8-byte alignment has changed in GCC 5

  240 |  i_lpm->max_rules = config->max_rules;
      |  ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

[328/2415] Compiling C object 'drivers/a715181@@tmp_rte_net_bnxt@sta/net_bnxt_tf_ulp_bnxt_ulp_flow.c.o'. ../drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c: In function ‘bnxt_ulp_init_mapper_params’:
../drivers/net/bnxt/tf_ulp/bnxt_ulp_flow.c:78:1: note: the layout of aggregates containing vectors with 8-byte alignment has changed in GCC 5
78 | bnxt_ulp_init_mapper_params(struct bnxt_ulp_mapper_create_parms
*mapper_cparms,

      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~

...

[1153/2415] Compiling C object 'drivers/a715181@@tmp_rte_net_ena@sta/net_ena_ena_ethdev.c.o'. In file included from ../lib/net/rte_ether.h:21,

                 from ../drivers/net/ena/ena_ethdev.c:7:
../drivers/net/ena/ena_ethdev.c: In function ‘ena_rss_key_fill’:
../lib/eal/ppc/include/rte_memcpy.h:53:2: warning: array subscript 3 is outside
array bounds of ‘uint8_t[40]’ {aka ‘unsigned char[40]’} [-Warray-bounds]
   53 |  vec_vsx_st(vec_vsx_ld(48, src), 48, dst);
      |  ^~~~~~~~~~
../drivers/net/ena/ena_ethdev.c:277:17: note: while referencing ‘default_key’
  277 |  static uint8_t default_key[ENA_HASH_KEY_SIZE];
      |                 ^~~~~~~~~~~
In file included from ../lib/net/rte_ether.h:21,
                 from ../drivers/net/ena/ena_ethdev.c:7:
../lib/eal/ppc/include/rte_memcpy.h:53:2: warning: array subscript [3, 7] is
outside array bounds of ‘uint8_t[40]’ {aka ‘unsigned char[40]’}
[-Warray-bounds]
   53 |  vec_vsx_st(vec_vsx_ld(48, src), 48, dst);
      |  ^~~~~~~~~~
../drivers/net/ena/ena_ethdev.c:277:17: note: while referencing ‘default_key’
  277 |  static uint8_t default_key[ENA_HASH_KEY_SIZE];
      |                 ^~~~~~~~~~~

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