Build of xrootd-4.7.1-rc2 for RHEL7 platform in koji fails on declared with attribute warn_unused_result [-Werror=unused-result] -- a warning that gets turned into an error:

/builddir/build/BUILD/xrootd-4.7.1-rc2/src/./XrdCl/XrdClUtils.hh:282:31: error: ignoring return value of 'int setfsuid(__uid_t)', declared with attribute warn_unused_result [-Werror=unused-result]
           setfsuid(pPrevFsUid);
                               ^
[ 53%] /builddir/build/BUILD/xrootd-4.7.1-rc2/src/./XrdCl/XrdClUtils.hh:286:31: error: ignoring return value of 'int setfsgid(__gid_t)', declared with attribute warn_unused_result [-Werror=unused-result]
           setfsgid(pPrevFsGid);
                               ^

Bit of googling suggested workaround using cast to (void) to ignore it but including such patch doesn't help either and I see same build error:

/builddir/build/BUILD/xrootd-4.7.1-rc2/src/./XrdCl/XrdClUtils.hh:282:31: error: ignoring return value of 'int setfsuid(__uid_t)', declared with attribute warn_unused_result [-Werror=unused-result]
           setfsuid(pPrevFsUid);
                               ^
[ 53%] /builddir/build/BUILD/xrootd-4.7.1-rc2/src/./XrdCl/XrdClUtils.hh:286:31: error: ignoring return value of 'int setfsgid(__gid_t)', declared with attribute warn_unused_result [-Werror=unused-result]
           setfsgid(pPrevFsGid);
                               ^

Full build.log you can find here.

Build for RHEL6 works just fine.

Thanks,
Marian

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