[
https://issues.apache.org/jira/browse/HDFS-17636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17888728#comment-17888728
]
ASF GitHub Bot commented on HDFS-17636:
---------------------------------------
GauthamBanasandra commented on PR #7096:
URL: https://github.com/apache/hadoop/pull/7096#issuecomment-2407875663
> Started Windows CI on this PR -
https://ci-hadoop.apache.org/view/Hadoop/job/hadoop-qbt-trunk-java8-win10-x86_64/654/
@kevincai the Windows CI failed to build the HDFS native client due to the
following error -
```
[exec] Link:
[exec] C:\Program Files (x86)\Microsoft Visual
Studio\2019\BuildTools\VC\Tools\MSVC\14.29.30133\bin\HostX64\x64\link.exe
/ERRORREPORT:QUEUE
/OUT:"C:\hadoop\hadoop-hdfs-project\hadoop-hdfs-native-client\target\native\main\native\libhdfspp\tests\RelWithDebInfo\get_jni_test.exe"
/INCREMENTAL:NO /NOLOGO ..\..\..\..\lib\RelWithDebInfo\gmock_main.lib
..\..\..\..\bin\RelWithDebInfo\hdfs.lib
"C:\Java\zulu8.62.0.19-ca-jdk8.0.332-win_x64\lib\jvm.lib" kernel32.lib
user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib
comdlg32.lib advapi32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker'
uiAccess='false'" /manifest:embed /DEBUG
/PDB:"C:/hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/target/native/main/native/libhdfspp/tests/RelWithDebInfo/get_jni_test.pdb"
/SUBSYSTEM:CONSOLE /TLBID:1 /DYNAMICBASE /NXCOMPAT
/IMPLIB:"C:/hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/target/native/main/native/libhdfspp/tests/RelWithDebInfo/get_jni_test.lib"
/MACHINE:X64 /machine:x64
get_jni_test.dir\RelWithDebInfo\libhdfs_getjni_test.obj
[exec] jvm.lib(jvm.dll) : error LNK2005: JNI_CreateJavaVM already
defined in libhdfs_getjni_test.obj
[C:\hadoop\hadoop-hdfs-project\hadoop-hdfs-native-client\target\native\main\native\libhdfspp\tests\get_jni_test.vcxproj]
[exec] Creating library
C:/hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/target/native/main/native/libhdfspp/tests/RelWithDebInfo/get_jni_test.lib
and object
C:/hadoop/hadoop-hdfs-project/hadoop-hdfs-native-client/target/native/main/native/libhdfspp/tests/RelWithDebInfo/get_jni_test.exp
[exec]
C:\hadoop\hadoop-hdfs-project\hadoop-hdfs-native-client\target\native\main\native\libhdfspp\tests\RelWithDebInfo\get_jni_test.exe
: fatal error LNK1169: one or more multiply defined symbols found
[C:\hadoop\hadoop-hdfs-project\hadoop-hdfs-native-client\target\native\main\native\libhdfspp\tests\get_jni_test.vcxproj]
```
The error seems valid. You've defined `JNI_CreateJavaVM` in
[libhdfs_getjni_test.cc](https://github.com/apache/hadoop/pull/6969/files#diff-589ac64cc250ab38f319997b6247594d71d19bdb4b73ddea59730cfab39611be).
This method is already present in the `jvm.dll`.
Were you trying to override the definition for `JNI_CreateJavaVM`? If so,
you shouldn't be linking `jvm.dll` to `get_jni_test` in `CMakeLists.txt`.
> Don't add declspec for Windows
> ------------------------------
>
> Key: HDFS-17636
> URL: https://issues.apache.org/jira/browse/HDFS-17636
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: libhdfs
> Affects Versions: 3.5.0
> Environment: Windows 10/11
> Reporter: Gautham Banasandra
> Assignee: Gautham Banasandra
> Priority: Blocker
>
> * Windows doesn't want the
> macro _JNI_IMPORT_OR_EXPORT_
> to be defined in the function
> definition. It fails to compile with
> the following error -
> "definition of dllimport function
> not allowed".
> * However, Linux needs it. Hence,
> we're going to add this macro
> based on the OS.
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