[Impala-ASF-CR] IMPALA-8359: Fix coverage data generation for impalads

["Zoltan Borok-Nagy (Code Review)" <ge...@cloudera.org>]

Hello Joe McDonnell, Impala Public Jenkins, 

I'd like you to reexamine a change. Please visit

    http://gerrit.cloudera.org:8080/12858

to look at the new patch set (#3).

Change subject: IMPALA-8359: Fix coverage data generation for impalads
......................................................................

IMPALA-8359: Fix coverage data generation for impalads

impala::InitCommonRuntime() sets a signal handler for SIGTERM.
It calls _exit(0) which causes normal program termination without
cleaning up, i.e. no destructors are called etc.

Gcov writes the coverage data in this cleanup phase, so calling
_exit() prevents flushing coverage data.

Now the '-codecoverage' flag also defines a macro named
CODE_COVERAGE_ENABLED. If this macro is defined we explicitly
call __gcov_flush() before calling _exit().

I tested manually.

Change-Id: I9be1e1e73b6cfc3557077f763aee4dbfcc7a2d27
---
M be/CMakeLists.txt
M be/src/common/init.cc
2 files changed, 19 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/58/12858/3
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I9be1e1e73b6cfc3557077f763aee4dbfcc7a2d27
Gerrit-Change-Number: 12858
Gerrit-PatchSet: 3
Gerrit-Owner: Zoltan Borok-Nagy <bo...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <im...@cloudera.com>
Gerrit-Reviewer: Joe McDonnell <jo...@cloudera.com>
Gerrit-Reviewer: Zoltan Borok-Nagy <bo...@cloudera.com>