[Bug 1003] unbalanced braces in header files for extern C declarations causing C++ compilation errors

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1003

            Bug ID: 1003
           Summary: unbalanced braces in header files for extern C
                    declarations causing C++ compilation errors
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: swasson at microsoft.com
  Target Milestone: ---

This was introduced in DPDK 20.11.5.  20.11.4 did not have these issues:

There are a few header files that have multiple extern C declarations, and some
of them have unbalanced braces.  This causes C++ compiler errors.

To find them all:

 $ find . -name '*.h'|xargs grep 'extern "C' > foo
 $ find . -name '*.h'|xargs grep 'extern "C'|uniq > bar
 $ diff foo bar
102d101
< ./lib/librte_eventdev/rte_eventdev_pmd.h:extern "C" {
105d103
< ./lib/librte_eventdev/rte_eventdev_pmd_pci.h:extern "C" {
110d107
< ./lib/librte_eventdev/rte_eventdev_pmd_vdev.h:extern "C" {
153d149
< ./lib/librte_ethdev/rte_ethdev_driver.h:extern "C" {

rte_eventdev_pmd.h merely has two nested extern C blocks.

rte_eventdev_pmd_pci.h has two nested extern C blocks, but only one closing
brace at the bottom of the file.

The same is true for rte_ethdev_driver.h and rte_eventdev_pmd_vdev.h.

The latter three cause compilation errors when included from C++ code.

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