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Posted to common-issues@hadoop.apache.org by "Gautham Banasandra (Jira)" <ji...@apache.org> on 2022/06/29 17:26:00 UTC
[jira] [Commented] (HADOOP-17196) Fix C/C++ standard warnings
[ https://issues.apache.org/jira/browse/HADOOP-17196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17560586#comment-17560586 ]
Gautham Banasandra commented on HADOOP-17196:
---------------------------------------------
[~iwasakims] here's how you can upgrade to GCC 9 on Centos 7 -
1. Run these commands - https://github.com/apache/hadoop/blob/2d133a54ac91bb961805915045b6ced2d06801ec/dev-support/docker/Dockerfile_centos_7#L37-L40
2. yum install devtoolset-9
3. Run this command - https://github.com/apache/hadoop/blob/2d133a54ac91bb961805915045b6ced2d06801ec/dev-support/docker/Dockerfile_centos_7#L44-L45
4. Set these environment variables - https://github.com/apache/hadoop/blob/2d133a54ac91bb961805915045b6ced2d06801ec/dev-support/docker/Dockerfile_centos_7#L48-L61
It would be the responsibility of the downstream projects to align with the dependencies of Hadoop, not the other way around. It would be detrimental to the evolution of the Hadoop project otherwise.
> Fix C/C++ standard warnings
> ---------------------------
>
> Key: HADOOP-17196
> URL: https://issues.apache.org/jira/browse/HADOOP-17196
> Project: Hadoop Common
> Issue Type: Bug
> Components: build
> Affects Versions: 3.1.3
> Environment: Windows 10 Pro 64-bit
> Reporter: Gautham Banasandra
> Assignee: Gautham Banasandra
> Priority: Major
> Fix For: 3.2.2, 3.3.1, 3.4.0
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> The C/C++ language standard is not specified in a cross-compiler manner. Even though it's as straight forward as passing *-std* as compiler arguments, not all the values are supported by all the compilers. For example, compilation with the Visual C++ compiler on Windows with *-std=gnu99* flag causes the following warning -
> {code:java}
> cl : command line warning D9002: ignoring unknown option '-std=gnu99' [Z:\hadoop-hdfs-project\hadoop-hdfs-native-client\target\native\main\native\libhdfs-examples\hdfs_read.vcxproj] {code}
> Thus, we need to use the appropriate flags provided by CMake to specify the C/C++ standards so that it is compiler friendly.
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