Why Do I Get Semantic Errors in Eclipse After Updating My NDK?

Semantic Errors in Eclipse After NDK Update

Eclipse users may encounter semantic errors after updating their NDK, despite successful compilation. This issue, commonly reported on StackOverflow, affects projects that utilize OpenCV4Android.

Symptoms:

Compilation succeeds, but Eclipse displays semantic errors, particularly for symbols like distance, pt, queryIdx, and trainIdx. These errors occur when C files from the jni folder are opened in Eclipse.

Troubleshooting Steps:

• Clean project
• Rebuild, refresh index
• Disable/enable indexer in preferences
• Verify OpenCV includes in Paths and Symbols
• Change include order in Paths and Symbols

Observations:

• The errors are likely related to the CDT index.
• Command-line build succeeds.
• Semantic errors only appear in C files.
• Eclipse can build and deploy Android applications without errors if C files are not opened.

Solution:

To resolve this issue, go to the following project preferences in Eclipse:

C/C++ General -> Code Analysis -> Launching

Uncheck both checkboxes:

• "Skip source analysis on launching"
• "Skip type analysis on launching"

Conclusion

By unchecking these checkboxes, the CDT index is disabled during launch, preventing it from generating semantic errors. Eclipse will then successfully compile projects without these errors.

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