[HADOOP-17196] Fix C/C++ standard warnings

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.1.3
• Fix Version/s: 3.4.0
• Component/s: build

Environment

Windows 10 Pro 64-bit

• Hadoop Flags: Reviewed
• Assignee: Gautham Banasandra
• Reporter: Gautham Banasandra
• Created: 10/Aug/20 17:06
• Updated: 30/Jun/22 14:34
• Resolved: 11/Aug/20 07:49

Description

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 -

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] 

Thus, we need to use the appropriate flags provided by CMake to specify the C/C++ standards so that it is compiler friendly.

Issue Links

• is a child of: HADOOP-17193 Compile Hadoop on Windows natively
• is related to: HDFS-14394 Add -std=c99 / -std=gnu99 to libhdfs compile flags
• relates to: BIGTOP-3457 Add libhdfspp packages to hadoop
• links to: https://github.com/apache/hadoop/pull/2208