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Disable the -Wduplicated-branches warning

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Depending on the platform/architecture, a number of conditionals
in libvirt code expand the same on both branches. This is expected
behaviour and harmless, so disable the warning to avoid creating
unexpected build failures

Two examples, mingw32:

../../src/util/vircommand.c: In function 'virCommandWait':
../../src/util/vircommand.c:2562:51: error: this condition has identical branches [-Werror=duplicated-branches]
             *exitstatus = cmd->rawStatus ? status : WEXITSTATUS(status);
                                                   ^
and gcc7.1

In file included from util/virobject.c:28:0:
util/virobject.c: In function 'virClassNew':
util/viratomic.h:176:46: error: this condition has identical branches [-Werror=duplicated-branches]
            (void)(0 ? *(atomic) ^ *(atomic) : 0);                      \
                                             ^
util/virobject.c:144:20: note: in expansion of macro 'virAtomicIntInc'
    klass->magic = virAtomicIntInc(&magicCounter);
                   ^~~~~~~~~~~~~~~

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 1ba693994a)
This commit is contained in:
Daniel P. Berrange 2017-06-14 15:10:02 +01:00 committed by Cole Robinson
parent 68b19542ec
commit 5f71aa7347
1 changed files with 3 additions and 0 deletions
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3
m4/virt-compile-warnings.m4
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@ -61,6 +61,9 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
dontwarn="$dontwarn -Wenum-compare"
# gcc 5.1 -Wformat-signedness mishandles enums, not ready for prime time
dontwarn="$dontwarn -Wformat-signedness"
# Several conditionals expand the same on both branches
# depending on the particular platform/architecture
dontwarn="$dontwarn -Wduplicated-branches"
# gcc 4.2 treats attribute(format) as an implicit attribute(nonnull),
# which triggers spurious warnings for our usage