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From "Anatoli Shein (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11971) libhdfs++: A few portability issues
Date Mon, 19 Jun 2017 16:16:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anatoli Shein updated HDFS-11971:
---------------------------------
    Attachment: HDFS-11971.HDFS-8707.003.patch

I also just noticed another small portability issue. We should not use absolute paths to /lib
and /include for the install targets, it is better to make them relative to the destination
instead. This avoids permission errors when libhdfspp is trying to copy files into /lib and
/include directories. It will now copy them to <destination>/lib and <destination>/include
Change added in a new patch.

> libhdfs++: A few portability issues
> -----------------------------------
>
>                 Key: HDFS-11971
>                 URL: https://issues.apache.org/jira/browse/HDFS-11971
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Anatoli Shein
>            Assignee: Anatoli Shein
>         Attachments: HDFS-11971.HDFS-8707.000.patch, HDFS-11971.HDFS-8707.001.patch,
HDFS-11971.HDFS-8707.002.patch, HDFS-11971.HDFS-8707.003.patch
>
>
> I recently encountered a few portability issues with libhdfs++ while trying to build
it as a stand alone project (and also as part of another Apache project).
> 1. Method fixCase in configuration.h file produces a warning "conversion to ‘char’
from ‘int’ may alter its value [-Werror=conversion]" which does not allow libhdfs++ to
be compiled as part of the codebase that treats such warnings as errors (can be fixed with
a simple cast).
> 2. In CMakeLists.txt file (in libhdfspp directory) we do find_package(Threads) however
we do not link it to the targets (e.g. hdfspp_static), which causes the build to fail with
pthread errors. After the Threads package is found we need to link it using ${CMAKE_THREAD_LIBS_INIT}.
> 3. All the tools and examples fail to build as part of a standalone libhdfs++ because
they are missing multiple libraries such as protobuf, ssl, pthread, etc. This happens because
we link them to a shared library hdfspp instead of hdfspp_static library. We should either
link all the tools and examples to hdfspp_static library or explicitly add linking to all
missing libraries for each tool/example.



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