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https://issues.apache.org/jira/browse/HDFS-12026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16664225#comment-16664225
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Chen Liang commented on HDFS-12026:
-----------------------------------
Thanks for reply [~anatoli.shein], [~sunilg]!
The error we hit was:
{code:java}
CMake Error at main/native/libhdfspp/CMakeLists.txt:64 (message):
FATAL ERROR: The required feature thread_local storage is not supported by
your compiler. Known compilers that support this feature: GCC, Visual
Studio, Clang (community version), Clang (version for iOS 9 and later).
{code}
We encountered this error when building on a rhel 6.6 machine (with glibc 2.12
and gcc 4.4.7), the build failed. Then we switched to a rhel 7.4 machine (with
glibc 2.17 and gcc 4.8.5) and the build succeeded. I did some checking, it
appeared to me that this syntax thread_local is supported only in gcc 4.8+ (not
too sure about which glibc version though). One resource I checked was pages
for [4.4|https://gcc.gnu.org/gcc-4.4/cxx0x_status.html],
[4.7|https://gcc.gnu.org/gcc-4.7/cxx0x_status.html] and
[4.8|https://gcc.gnu.org/gcc-4.8/cxx0x_status.html] (just search for
"thread-local storage").
The issue here, is that rhel6 does not support upgrading to gcc 4.8. see
[here|https://access.redhat.com/solutions/19458]... So there seems no way to
have this keyword on rhel6. Since the keyword thread_local is not available for
rhel6, it would break compatibility.
I guess it may not be necessary to revert the Jira/the whole branch, but we
should have some way of getting around and not break the build on rhel6.
> libhdfs++: Fix compilation errors and warnings when compiling with Clang
> -------------------------------------------------------------------------
>
> Key: HDFS-12026
> URL: https://issues.apache.org/jira/browse/HDFS-12026
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Anatoli Shein
> Assignee: Anatoli Shein
> Priority: Blocker
> Attachments: HDFS-12026.HDFS-8707.000.patch,
> HDFS-12026.HDFS-8707.001.patch, HDFS-12026.HDFS-8707.002.patch,
> HDFS-12026.HDFS-8707.003.patch, HDFS-12026.HDFS-8707.004.patch,
> HDFS-12026.HDFS-8707.005.patch, HDFS-12026.HDFS-8707.006.patch,
> HDFS-12026.HDFS-8707.007.patch, HDFS-12026.HDFS-8707.008.patch,
> HDFS-12026.HDFS-8707.009.patch, HDFS-12026.HDFS-8707.010.patch
>
>
> Currently multiple errors and warnings prevent libhdfspp from being compiled
> with clang. It should compile cleanly using flag:
> -std=c++11
> and also warning flags:
> -Weverything -Wno-c++98-compat -Wno-missing-prototypes
> -Wno-c++98-compat-pedantic -Wno-padded -Wno-covered-switch-default
> -Wno-missing-noreturn -Wno-unknown-pragmas -Wconversion -Werror
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